/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/parallel/parallel-sum-equiv.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-a47a088281b0b97d17910950432b7c5b5bc3adeb-a47a088 [2021-07-13 19:53:08,899 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-07-13 19:53:08,900 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-07-13 19:53:08,932 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-07-13 19:53:08,992 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf [2021-07-13 19:53:09,041 INFO L113 SettingsManager]: Loading preferences was successful [2021-07-13 19:53:09,041 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-07-13 19:53:09,041 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-07-13 19:53:09,042 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-07-13 19:53:09,043 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-07-13 19:53:09,043 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-07-13 19:53:09,043 INFO L138 SettingsManager]: * Use SBE=true [2021-07-13 19:53:09,043 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-07-13 19:53:09,043 INFO L138 SettingsManager]: * sizeof long=4 [2021-07-13 19:53:09,043 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-07-13 19:53:09,044 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-07-13 19:53:09,044 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-07-13 19:53:09,044 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-07-13 19:53:09,044 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-07-13 19:53:09,044 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-07-13 19:53:09,044 INFO L138 SettingsManager]: * sizeof long double=12 [2021-07-13 19:53:09,045 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-07-13 19:53:09,045 INFO L138 SettingsManager]: * Use constant arrays=true [2021-07-13 19:53:09,045 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-07-13 19:53:09,045 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-07-13 19:53:09,045 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-07-13 19:53:09,045 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-07-13 19:53:09,045 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-07-13 19:53:09,046 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-07-13 19:53:09,046 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-07-13 19:53:09,046 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-07-13 19:53:09,046 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-07-13 19:53:09,046 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-07-13 19:53:09,046 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-07-13 19:53:09,046 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-07-13 19:53:09,047 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-07-13 19:53:09,047 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-07-13 19:53:09,351 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-07-13 19:53:09,369 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-07-13 19:53:09,371 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-07-13 19:53:09,372 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-07-13 19:53:09,374 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-07-13 19:53:09,375 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/parallel/parallel-sum-equiv.wvr.bpl [2021-07-13 19:53:09,375 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/parallel/parallel-sum-equiv.wvr.bpl' [2021-07-13 19:53:09,411 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-07-13 19:53:09,413 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-07-13 19:53:09,417 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-07-13 19:53:09,417 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-07-13 19:53:09,417 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-07-13 19:53:09,428 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,435 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,441 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-07-13 19:53:09,442 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-07-13 19:53:09,442 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-07-13 19:53:09,442 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-07-13 19:53:09,448 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,448 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,449 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,449 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,451 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,453 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,453 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... [2021-07-13 19:53:09,454 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-07-13 19:53:09,455 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-07-13 19:53:09,455 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-07-13 19:53:09,455 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-07-13 19:53:09,456 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-07-13 19:53:09,508 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-07-13 19:53:09,508 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-07-13 19:53:09,508 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-07-13 19:53:09,508 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-07-13 19:53:09,508 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-07-13 19:53:09,508 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-07-13 19:53:09,509 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-07-13 19:53:09,509 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-07-13 19:53:09,509 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-07-13 19:53:09,509 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-07-13 19:53:09,509 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-07-13 19:53:09,509 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-07-13 19:53:09,509 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread4 given in one single declaration [2021-07-13 19:53:09,510 INFO L130 BoogieDeclarations]: Found specification of procedure thread4 [2021-07-13 19:53:09,510 INFO L138 BoogieDeclarations]: Found implementation of procedure thread4 [2021-07-13 19:53:09,510 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-07-13 19:53:09,712 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-07-13 19:53:09,713 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-07-13 19:53:09,713 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread2EXIT is neither atomic block end nor error location. [2021-07-13 19:53:09,714 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread3EXIT is neither atomic block end nor error location. [2021-07-13 19:53:09,714 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread4EXIT is neither atomic block end nor error location. [2021-07-13 19:53:09,715 INFO L202 PluginConnector]: Adding new model parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.07 07:53:09 BoogieIcfgContainer [2021-07-13 19:53:09,715 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-07-13 19:53:09,717 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-07-13 19:53:09,717 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-07-13 19:53:09,719 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-07-13 19:53:09,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:53:09" (1/2) ... [2021-07-13 19:53:09,720 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b993ba7 and model type parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.07 07:53:09, skipping insertion in model container [2021-07-13 19:53:09,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.07 07:53:09" (2/2) ... [2021-07-13 19:53:09,721 INFO L111 eAbstractionObserver]: Analyzing ICFG parallel-sum-equiv.wvr.bpl [2021-07-13 19:53:09,738 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-07-13 19:53:09,738 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-07-13 19:53:09,739 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-07-13 19:53:09,739 INFO L474 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-07-13 19:53:09,829 INFO L149 ThreadInstanceAdder]: Constructed 10 joinOtherThreadTransitions. [2021-07-13 19:53:09,844 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-07-13 19:53:09,860 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-07-13 19:53:09,860 INFO L379 AbstractCegarLoop]: Hoare is false [2021-07-13 19:53:09,860 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-07-13 19:53:09,861 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-07-13 19:53:09,861 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-07-13 19:53:09,861 INFO L383 AbstractCegarLoop]: Difference is false [2021-07-13 19:53:09,861 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-07-13 19:53:09,861 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == thread1Thread1of1ForFork0======== [2021-07-13 19:53:09,879 INFO L110 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 41 places, 33 transitions, 110 flow [2021-07-13 19:53:09,893 INFO L132 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 26 states, 25 states have (on average 2.04) internal successors, (51), 25 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:09,895 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 25 states have (on average 2.04) internal successors, (51), 25 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:09,900 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-07-13 19:53:09,901 INFO L301 ceAbstractionStarter]: Result for error location thread1Thread1of1ForFork0 was SAFE (1/2) [2021-07-13 19:53:09,902 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-07-13 19:53:09,914 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-07-13 19:53:09,914 INFO L379 AbstractCegarLoop]: Hoare is false [2021-07-13 19:53:09,914 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-07-13 19:53:09,914 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-07-13 19:53:09,914 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-07-13 19:53:09,915 INFO L383 AbstractCegarLoop]: Difference is false [2021-07-13 19:53:09,915 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-07-13 19:53:09,915 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-07-13 19:53:09,918 INFO L110 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 41 places, 33 transitions, 110 flow [2021-07-13 19:53:09,938 INFO L132 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 103 states, 102 states have (on average 2.911764705882353) internal successors, (297), 102 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:09,939 INFO L276 IsEmpty]: Start isEmpty. Operand has 103 states, 102 states have (on average 2.911764705882353) internal successors, (297), 102 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:09,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-07-13 19:53:09,942 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:09,944 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:09,944 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:09,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:09,948 INFO L82 PathProgramCache]: Analyzing trace with hash 848381826, now seen corresponding path program 1 times [2021-07-13 19:53:09,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:09,955 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090936837] [2021-07-13 19:53:09,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:10,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:10,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:10,183 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:10,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090936837] [2021-07-13 19:53:10,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090936837] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:10,185 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:10,185 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-07-13 19:53:10,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654214901] [2021-07-13 19:53:10,190 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-07-13 19:53:10,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:10,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-07-13 19:53:10,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-07-13 19:53:10,205 INFO L87 Difference]: Start difference. First operand has 103 states, 102 states have (on average 2.911764705882353) internal successors, (297), 102 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:10,280 INFO L93 Difference]: Finished difference Result 253 states and 745 transitions. [2021-07-13 19:53:10,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-07-13 19:53:10,282 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-07-13 19:53:10,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:10,301 INFO L225 Difference]: With dead ends: 253 [2021-07-13 19:53:10,301 INFO L226 Difference]: Without dead ends: 247 [2021-07-13 19:53:10,303 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:10,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-07-13 19:53:10,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 143. [2021-07-13 19:53:10,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 2.936619718309859) internal successors, (417), 142 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 417 transitions. [2021-07-13 19:53:10,369 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 417 transitions. Word has length 16 [2021-07-13 19:53:10,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:10,370 INFO L482 AbstractCegarLoop]: Abstraction has 143 states and 417 transitions. [2021-07-13 19:53:10,370 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,371 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 417 transitions. [2021-07-13 19:53:10,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-07-13 19:53:10,375 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:10,375 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:10,376 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-07-13 19:53:10,376 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:10,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:10,377 INFO L82 PathProgramCache]: Analyzing trace with hash 890214852, now seen corresponding path program 2 times [2021-07-13 19:53:10,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:10,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772126754] [2021-07-13 19:53:10,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:10,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:10,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:10,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:10,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772126754] [2021-07-13 19:53:10,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772126754] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:10,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:10,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-07-13 19:53:10,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409090616] [2021-07-13 19:53:10,443 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-07-13 19:53:10,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:10,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-07-13 19:53:10,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-07-13 19:53:10,445 INFO L87 Difference]: Start difference. First operand 143 states and 417 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:10,475 INFO L93 Difference]: Finished difference Result 262 states and 765 transitions. [2021-07-13 19:53:10,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-07-13 19:53:10,476 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-07-13 19:53:10,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:10,478 INFO L225 Difference]: With dead ends: 262 [2021-07-13 19:53:10,478 INFO L226 Difference]: Without dead ends: 256 [2021-07-13 19:53:10,479 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:10,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-07-13 19:53:10,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 145. [2021-07-13 19:53:10,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 2.923611111111111) internal successors, (421), 144 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 421 transitions. [2021-07-13 19:53:10,495 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 421 transitions. Word has length 16 [2021-07-13 19:53:10,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:10,495 INFO L482 AbstractCegarLoop]: Abstraction has 145 states and 421 transitions. [2021-07-13 19:53:10,496 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,496 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 421 transitions. [2021-07-13 19:53:10,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:10,498 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:10,498 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:10,498 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-07-13 19:53:10,498 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:10,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:10,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1702344252, now seen corresponding path program 1 times [2021-07-13 19:53:10,499 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:10,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740067496] [2021-07-13 19:53:10,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:10,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:10,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:10,535 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:10,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740067496] [2021-07-13 19:53:10,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740067496] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:10,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987812911] [2021-07-13 19:53:10,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:10,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:10,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2021-07-13 19:53:10,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:10,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:10,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987812911] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:10,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:10,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-07-13 19:53:10,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013490573] [2021-07-13 19:53:10,714 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-07-13 19:53:10,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:10,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-07-13 19:53:10,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-07-13 19:53:10,716 INFO L87 Difference]: Start difference. First operand 145 states and 421 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:10,831 INFO L93 Difference]: Finished difference Result 199 states and 578 transitions. [2021-07-13 19:53:10,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-07-13 19:53:10,832 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:10,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:10,833 INFO L225 Difference]: With dead ends: 199 [2021-07-13 19:53:10,833 INFO L226 Difference]: Without dead ends: 199 [2021-07-13 19:53:10,834 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 40.0ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:53:10,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-07-13 19:53:10,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 149. [2021-07-13 19:53:10,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 3.0067567567567566) internal successors, (445), 148 states have internal predecessors, (445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 445 transitions. [2021-07-13 19:53:10,844 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 445 transitions. Word has length 18 [2021-07-13 19:53:10,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:10,844 INFO L482 AbstractCegarLoop]: Abstraction has 149 states and 445 transitions. [2021-07-13 19:53:10,844 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:10,845 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 445 transitions. [2021-07-13 19:53:10,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:10,845 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:10,845 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:11,068 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-07-13 19:53:11,069 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:11,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:11,069 INFO L82 PathProgramCache]: Analyzing trace with hash -735916285, now seen corresponding path program 1 times [2021-07-13 19:53:11,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:11,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870276741] [2021-07-13 19:53:11,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:11,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:11,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:11,119 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:11,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870276741] [2021-07-13 19:53:11,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870276741] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:11,122 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:11,122 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:11,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341514497] [2021-07-13 19:53:11,122 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:11,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:11,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:11,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:11,123 INFO L87 Difference]: Start difference. First operand 149 states and 445 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:11,193 INFO L93 Difference]: Finished difference Result 246 states and 702 transitions. [2021-07-13 19:53:11,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-07-13 19:53:11,193 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:11,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:11,195 INFO L225 Difference]: With dead ends: 246 [2021-07-13 19:53:11,195 INFO L226 Difference]: Without dead ends: 214 [2021-07-13 19:53:11,196 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 30.6ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:53:11,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-07-13 19:53:11,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 164. [2021-07-13 19:53:11,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 163 states have (on average 2.901840490797546) internal successors, (473), 163 states have internal predecessors, (473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 473 transitions. [2021-07-13 19:53:11,213 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 473 transitions. Word has length 18 [2021-07-13 19:53:11,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:11,213 INFO L482 AbstractCegarLoop]: Abstraction has 164 states and 473 transitions. [2021-07-13 19:53:11,213 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,213 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 473 transitions. [2021-07-13 19:53:11,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:11,214 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:11,214 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:11,214 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-07-13 19:53:11,214 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:11,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:11,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1382578898, now seen corresponding path program 1 times [2021-07-13 19:53:11,215 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:11,215 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061378990] [2021-07-13 19:53:11,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:11,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:11,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:11,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:11,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061378990] [2021-07-13 19:53:11,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061378990] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:11,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:11,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-07-13 19:53:11,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291087429] [2021-07-13 19:53:11,247 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-07-13 19:53:11,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:11,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-07-13 19:53:11,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-07-13 19:53:11,249 INFO L87 Difference]: Start difference. First operand 164 states and 473 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:11,261 INFO L93 Difference]: Finished difference Result 153 states and 416 transitions. [2021-07-13 19:53:11,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-07-13 19:53:11,263 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:11,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:11,264 INFO L225 Difference]: With dead ends: 153 [2021-07-13 19:53:11,264 INFO L226 Difference]: Without dead ends: 137 [2021-07-13 19:53:11,264 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-07-13 19:53:11,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-07-13 19:53:11,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 133. [2021-07-13 19:53:11,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 2.7954545454545454) internal successors, (369), 132 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 369 transitions. [2021-07-13 19:53:11,270 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 369 transitions. Word has length 18 [2021-07-13 19:53:11,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:11,270 INFO L482 AbstractCegarLoop]: Abstraction has 133 states and 369 transitions. [2021-07-13 19:53:11,270 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,270 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 369 transitions. [2021-07-13 19:53:11,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:11,271 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:11,271 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:11,271 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-07-13 19:53:11,271 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:11,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:11,272 INFO L82 PathProgramCache]: Analyzing trace with hash -1747969668, now seen corresponding path program 2 times [2021-07-13 19:53:11,275 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:11,275 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111244825] [2021-07-13 19:53:11,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:11,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:11,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:11,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:11,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111244825] [2021-07-13 19:53:11,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111244825] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:11,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452488295] [2021-07-13 19:53:11,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:11,376 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:11,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:11,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2021-07-13 19:53:11,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:11,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:11,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452488295] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:11,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:11,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-07-13 19:53:11,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850685227] [2021-07-13 19:53:11,454 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-07-13 19:53:11,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:11,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-07-13 19:53:11,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:53:11,455 INFO L87 Difference]: Start difference. First operand 133 states and 369 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:11,492 INFO L93 Difference]: Finished difference Result 205 states and 550 transitions. [2021-07-13 19:53:11,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-07-13 19:53:11,492 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:11,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:11,494 INFO L225 Difference]: With dead ends: 205 [2021-07-13 19:53:11,494 INFO L226 Difference]: Without dead ends: 205 [2021-07-13 19:53:11,494 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 30.0ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:53:11,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-07-13 19:53:11,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 136. [2021-07-13 19:53:11,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 2.837037037037037) internal successors, (383), 135 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 383 transitions. [2021-07-13 19:53:11,499 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 383 transitions. Word has length 18 [2021-07-13 19:53:11,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:11,499 INFO L482 AbstractCegarLoop]: Abstraction has 136 states and 383 transitions. [2021-07-13 19:53:11,500 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,500 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 383 transitions. [2021-07-13 19:53:11,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:11,500 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:11,500 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:11,723 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:11,724 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:11,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:11,724 INFO L82 PathProgramCache]: Analyzing trace with hash -141666181, now seen corresponding path program 2 times [2021-07-13 19:53:11,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:11,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752860748] [2021-07-13 19:53:11,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:11,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:11,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:11,761 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:11,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752860748] [2021-07-13 19:53:11,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752860748] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:11,762 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:11,762 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:11,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354647515] [2021-07-13 19:53:11,762 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:11,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:11,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:11,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:11,763 INFO L87 Difference]: Start difference. First operand 136 states and 383 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:11,854 INFO L93 Difference]: Finished difference Result 253 states and 641 transitions. [2021-07-13 19:53:11,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-07-13 19:53:11,855 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:11,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:11,856 INFO L225 Difference]: With dead ends: 253 [2021-07-13 19:53:11,856 INFO L226 Difference]: Without dead ends: 244 [2021-07-13 19:53:11,857 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 31.7ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:53:11,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-07-13 19:53:11,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 160. [2021-07-13 19:53:11,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 2.811320754716981) internal successors, (447), 159 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 447 transitions. [2021-07-13 19:53:11,866 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 447 transitions. Word has length 18 [2021-07-13 19:53:11,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:11,866 INFO L482 AbstractCegarLoop]: Abstraction has 160 states and 447 transitions. [2021-07-13 19:53:11,866 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,866 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 447 transitions. [2021-07-13 19:53:11,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:11,867 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:11,867 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:11,867 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-07-13 19:53:11,867 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:11,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:11,868 INFO L82 PathProgramCache]: Analyzing trace with hash -2044687976, now seen corresponding path program 3 times [2021-07-13 19:53:11,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:11,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782857708] [2021-07-13 19:53:11,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:11,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:11,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:11,911 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:11,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782857708] [2021-07-13 19:53:11,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782857708] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:11,912 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:11,912 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:11,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096755580] [2021-07-13 19:53:11,912 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:11,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:11,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:11,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:11,913 INFO L87 Difference]: Start difference. First operand 160 states and 447 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:11,966 INFO L93 Difference]: Finished difference Result 211 states and 560 transitions. [2021-07-13 19:53:11,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-07-13 19:53:11,967 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:11,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:11,968 INFO L225 Difference]: With dead ends: 211 [2021-07-13 19:53:11,968 INFO L226 Difference]: Without dead ends: 208 [2021-07-13 19:53:11,969 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 27.2ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:53:11,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-07-13 19:53:11,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 160. [2021-07-13 19:53:11,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 2.792452830188679) internal successors, (444), 159 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 444 transitions. [2021-07-13 19:53:11,975 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 444 transitions. Word has length 18 [2021-07-13 19:53:11,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:11,975 INFO L482 AbstractCegarLoop]: Abstraction has 160 states and 444 transitions. [2021-07-13 19:53:11,975 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:11,975 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 444 transitions. [2021-07-13 19:53:11,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:11,976 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:11,977 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:11,979 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-07-13 19:53:11,979 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:11,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:11,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1877852891, now seen corresponding path program 3 times [2021-07-13 19:53:11,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:11,979 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159254494] [2021-07-13 19:53:11,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:11,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:12,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:12,026 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:12,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159254494] [2021-07-13 19:53:12,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159254494] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:12,027 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:12,027 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:12,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578477581] [2021-07-13 19:53:12,027 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:12,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:12,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:12,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:12,028 INFO L87 Difference]: Start difference. First operand 160 states and 444 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:12,094 INFO L93 Difference]: Finished difference Result 190 states and 515 transitions. [2021-07-13 19:53:12,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-07-13 19:53:12,095 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:12,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:12,096 INFO L225 Difference]: With dead ends: 190 [2021-07-13 19:53:12,096 INFO L226 Difference]: Without dead ends: 190 [2021-07-13 19:53:12,097 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.4ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:53:12,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-07-13 19:53:12,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 142. [2021-07-13 19:53:12,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 2.8085106382978724) internal successors, (396), 141 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 396 transitions. [2021-07-13 19:53:12,102 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 396 transitions. Word has length 18 [2021-07-13 19:53:12,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:12,102 INFO L482 AbstractCegarLoop]: Abstraction has 142 states and 396 transitions. [2021-07-13 19:53:12,102 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,102 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 396 transitions. [2021-07-13 19:53:12,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:12,103 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:12,103 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:12,103 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-07-13 19:53:12,103 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:12,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:12,104 INFO L82 PathProgramCache]: Analyzing trace with hash -663824830, now seen corresponding path program 4 times [2021-07-13 19:53:12,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:12,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652034436] [2021-07-13 19:53:12,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:12,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:12,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:12,160 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:12,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652034436] [2021-07-13 19:53:12,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652034436] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:12,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562621631] [2021-07-13 19:53:12,161 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:12,205 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:12,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:12,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2021-07-13 19:53:12,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:12,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:12,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562621631] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:12,288 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:12,289 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-07-13 19:53:12,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105380793] [2021-07-13 19:53:12,289 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-07-13 19:53:12,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:12,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-07-13 19:53:12,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:53:12,290 INFO L87 Difference]: Start difference. First operand 142 states and 396 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:12,346 INFO L93 Difference]: Finished difference Result 193 states and 511 transitions. [2021-07-13 19:53:12,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-07-13 19:53:12,347 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:12,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:12,348 INFO L225 Difference]: With dead ends: 193 [2021-07-13 19:53:12,348 INFO L226 Difference]: Without dead ends: 193 [2021-07-13 19:53:12,348 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:53:12,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-07-13 19:53:12,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 142. [2021-07-13 19:53:12,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 2.8085106382978724) internal successors, (396), 141 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 396 transitions. [2021-07-13 19:53:12,353 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 396 transitions. Word has length 18 [2021-07-13 19:53:12,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:12,354 INFO L482 AbstractCegarLoop]: Abstraction has 142 states and 396 transitions. [2021-07-13 19:53:12,354 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,354 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 396 transitions. [2021-07-13 19:53:12,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:12,355 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:12,355 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:12,578 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-07-13 19:53:12,579 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:12,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:12,579 INFO L82 PathProgramCache]: Analyzing trace with hash 810916037, now seen corresponding path program 4 times [2021-07-13 19:53:12,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:12,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415722063] [2021-07-13 19:53:12,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:12,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:12,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:12,606 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:12,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415722063] [2021-07-13 19:53:12,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [415722063] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:12,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:12,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:12,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909351917] [2021-07-13 19:53:12,607 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:12,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:12,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:12,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:12,608 INFO L87 Difference]: Start difference. First operand 142 states and 396 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:12,692 INFO L93 Difference]: Finished difference Result 197 states and 512 transitions. [2021-07-13 19:53:12,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-07-13 19:53:12,693 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:12,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:12,694 INFO L225 Difference]: With dead ends: 197 [2021-07-13 19:53:12,694 INFO L226 Difference]: Without dead ends: 188 [2021-07-13 19:53:12,695 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 32.4ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:53:12,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-07-13 19:53:12,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 164. [2021-07-13 19:53:12,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 163 states have (on average 2.791411042944785) internal successors, (455), 163 states have internal predecessors, (455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 455 transitions. [2021-07-13 19:53:12,700 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 455 transitions. Word has length 18 [2021-07-13 19:53:12,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:12,700 INFO L482 AbstractCegarLoop]: Abstraction has 164 states and 455 transitions. [2021-07-13 19:53:12,701 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,701 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 455 transitions. [2021-07-13 19:53:12,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:12,703 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:12,703 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:12,703 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-07-13 19:53:12,703 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:12,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:12,704 INFO L82 PathProgramCache]: Analyzing trace with hash -951885686, now seen corresponding path program 5 times [2021-07-13 19:53:12,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:12,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207421245] [2021-07-13 19:53:12,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:12,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:12,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:12,738 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:12,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207421245] [2021-07-13 19:53:12,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207421245] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:12,738 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:12,738 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:12,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14268245] [2021-07-13 19:53:12,740 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:12,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:12,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:12,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:12,741 INFO L87 Difference]: Start difference. First operand 164 states and 455 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:12,831 INFO L93 Difference]: Finished difference Result 248 states and 641 transitions. [2021-07-13 19:53:12,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-07-13 19:53:12,832 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:12,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:12,833 INFO L225 Difference]: With dead ends: 248 [2021-07-13 19:53:12,833 INFO L226 Difference]: Without dead ends: 245 [2021-07-13 19:53:12,833 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 36.0ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:53:12,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-07-13 19:53:12,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 164. [2021-07-13 19:53:12,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 163 states have (on average 2.773006134969325) internal successors, (452), 163 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 452 transitions. [2021-07-13 19:53:12,840 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 452 transitions. Word has length 18 [2021-07-13 19:53:12,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:12,840 INFO L482 AbstractCegarLoop]: Abstraction has 164 states and 452 transitions. [2021-07-13 19:53:12,841 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,841 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 452 transitions. [2021-07-13 19:53:12,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:12,841 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:12,841 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:12,842 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-07-13 19:53:12,842 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:12,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:12,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1324312115, now seen corresponding path program 5 times [2021-07-13 19:53:12,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:12,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132965600] [2021-07-13 19:53:12,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:12,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:12,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:12,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:12,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132965600] [2021-07-13 19:53:12,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132965600] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:12,868 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:12,868 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:12,868 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283924372] [2021-07-13 19:53:12,869 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:12,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:12,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:12,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:12,870 INFO L87 Difference]: Start difference. First operand 164 states and 452 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:12,915 INFO L93 Difference]: Finished difference Result 190 states and 503 transitions. [2021-07-13 19:53:12,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-07-13 19:53:12,917 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:12,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:12,918 INFO L225 Difference]: With dead ends: 190 [2021-07-13 19:53:12,918 INFO L226 Difference]: Without dead ends: 190 [2021-07-13 19:53:12,918 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.4ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:53:12,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-07-13 19:53:12,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 161. [2021-07-13 19:53:12,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 160 states have (on average 2.775) internal successors, (444), 160 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 444 transitions. [2021-07-13 19:53:12,924 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 444 transitions. Word has length 18 [2021-07-13 19:53:12,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:12,924 INFO L482 AbstractCegarLoop]: Abstraction has 161 states and 444 transitions. [2021-07-13 19:53:12,924 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,924 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 444 transitions. [2021-07-13 19:53:12,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:12,925 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:12,925 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:12,925 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-07-13 19:53:12,925 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:12,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:12,926 INFO L82 PathProgramCache]: Analyzing trace with hash 11936556, now seen corresponding path program 6 times [2021-07-13 19:53:12,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:12,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21852083] [2021-07-13 19:53:12,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:12,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:12,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:12,944 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:12,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21852083] [2021-07-13 19:53:12,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21852083] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:12,944 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:12,944 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:12,944 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122552517] [2021-07-13 19:53:12,944 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:12,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:12,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:12,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:12,945 INFO L87 Difference]: Start difference. First operand 161 states and 444 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:12,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:12,998 INFO L93 Difference]: Finished difference Result 164 states and 446 transitions. [2021-07-13 19:53:12,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-07-13 19:53:12,999 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:13,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:13,001 INFO L225 Difference]: With dead ends: 164 [2021-07-13 19:53:13,001 INFO L226 Difference]: Without dead ends: 160 [2021-07-13 19:53:13,001 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 28.3ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:53:13,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-07-13 19:53:13,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2021-07-13 19:53:13,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 2.779874213836478) internal successors, (442), 159 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:13,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 442 transitions. [2021-07-13 19:53:13,006 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 442 transitions. Word has length 18 [2021-07-13 19:53:13,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:13,006 INFO L482 AbstractCegarLoop]: Abstraction has 160 states and 442 transitions. [2021-07-13 19:53:13,006 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:13,006 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 442 transitions. [2021-07-13 19:53:13,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-07-13 19:53:13,007 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:13,007 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:13,007 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-07-13 19:53:13,007 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:13,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:13,008 INFO L82 PathProgramCache]: Analyzing trace with hash 459545933, now seen corresponding path program 6 times [2021-07-13 19:53:13,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:13,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792801318] [2021-07-13 19:53:13,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:13,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:13,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:13,027 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:13,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792801318] [2021-07-13 19:53:13,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792801318] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:53:13,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:53:13,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-07-13 19:53:13,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136965954] [2021-07-13 19:53:13,028 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:53:13,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:13,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:53:13,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:53:13,029 INFO L87 Difference]: Start difference. First operand 160 states and 442 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:13,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:13,074 INFO L93 Difference]: Finished difference Result 153 states and 422 transitions. [2021-07-13 19:53:13,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-07-13 19:53:13,074 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-07-13 19:53:13,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:13,075 INFO L225 Difference]: With dead ends: 153 [2021-07-13 19:53:13,075 INFO L226 Difference]: Without dead ends: 153 [2021-07-13 19:53:13,076 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.4ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:53:13,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-07-13 19:53:13,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 135. [2021-07-13 19:53:13,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 2.791044776119403) internal successors, (374), 134 states have internal predecessors, (374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:13,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 374 transitions. [2021-07-13 19:53:13,080 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 374 transitions. Word has length 18 [2021-07-13 19:53:13,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:13,080 INFO L482 AbstractCegarLoop]: Abstraction has 135 states and 374 transitions. [2021-07-13 19:53:13,080 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:13,080 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 374 transitions. [2021-07-13 19:53:13,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:13,081 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:13,081 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:13,081 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-07-13 19:53:13,081 INFO L430 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:13,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:13,082 INFO L82 PathProgramCache]: Analyzing trace with hash 442648773, now seen corresponding path program 1 times [2021-07-13 19:53:13,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:13,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462276806] [2021-07-13 19:53:13,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:13,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:13,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:13,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:13,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462276806] [2021-07-13 19:53:13,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462276806] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:13,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069788435] [2021-07-13 19:53:13,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:13,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:13,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:13,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:13,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-07-13 19:53:13,447 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:13,452 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:13,457 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:13,457 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:19, output treesize:10 [2021-07-13 19:53:13,499 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:13,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069788435] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:13,499 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:13,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-07-13 19:53:13,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272223833] [2021-07-13 19:53:13,500 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:13,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:13,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:13,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:13,500 INFO L87 Difference]: Start difference. First operand 135 states and 374 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:13,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:13,956 INFO L93 Difference]: Finished difference Result 382 states and 1086 transitions. [2021-07-13 19:53:13,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-13 19:53:13,956 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:13,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:13,959 INFO L225 Difference]: With dead ends: 382 [2021-07-13 19:53:13,960 INFO L226 Difference]: Without dead ends: 372 [2021-07-13 19:53:13,960 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 301.4ms TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:53:13,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-07-13 19:53:13,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 186. [2021-07-13 19:53:13,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 185 states have (on average 2.8162162162162163) internal successors, (521), 185 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:13,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 521 transitions. [2021-07-13 19:53:13,967 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 521 transitions. Word has length 20 [2021-07-13 19:53:13,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:13,969 INFO L482 AbstractCegarLoop]: Abstraction has 186 states and 521 transitions. [2021-07-13 19:53:13,969 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:13,969 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 521 transitions. [2021-07-13 19:53:13,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:13,970 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:13,970 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:14,188 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:14,189 INFO L430 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:14,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:14,189 INFO L82 PathProgramCache]: Analyzing trace with hash 600946541, now seen corresponding path program 2 times [2021-07-13 19:53:14,190 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:14,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213273201] [2021-07-13 19:53:14,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:14,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:14,291 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:14,291 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:14,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213273201] [2021-07-13 19:53:14,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213273201] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:14,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857382596] [2021-07-13 19:53:14,291 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:14,329 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:14,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:14,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:14,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:14,549 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:14,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:14,553 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:14,564 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:14,577 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:14,578 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:28, output treesize:20 [2021-07-13 19:53:14,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:14,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857382596] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:14,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:14,663 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 16 [2021-07-13 19:53:14,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91586911] [2021-07-13 19:53:14,664 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-07-13 19:53:14,664 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:14,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-07-13 19:53:14,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:14,665 INFO L87 Difference]: Start difference. First operand 186 states and 521 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:15,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:15,727 INFO L93 Difference]: Finished difference Result 399 states and 1155 transitions. [2021-07-13 19:53:15,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:53:15,728 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:15,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:15,730 INFO L225 Difference]: With dead ends: 399 [2021-07-13 19:53:15,730 INFO L226 Difference]: Without dead ends: 389 [2021-07-13 19:53:15,731 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 825.9ms TimeCoverageRelationStatistics Valid=219, Invalid=1041, Unknown=0, NotChecked=0, Total=1260 [2021-07-13 19:53:15,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-07-13 19:53:15,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 189. [2021-07-13 19:53:15,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 2.8191489361702127) internal successors, (530), 188 states have internal predecessors, (530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:15,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 530 transitions. [2021-07-13 19:53:15,738 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 530 transitions. Word has length 20 [2021-07-13 19:53:15,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:15,738 INFO L482 AbstractCegarLoop]: Abstraction has 189 states and 530 transitions. [2021-07-13 19:53:15,738 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:15,738 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 530 transitions. [2021-07-13 19:53:15,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:15,739 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:15,739 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:15,952 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-07-13 19:53:15,953 INFO L430 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:15,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:15,953 INFO L82 PathProgramCache]: Analyzing trace with hash 424405109, now seen corresponding path program 3 times [2021-07-13 19:53:15,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:15,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854781018] [2021-07-13 19:53:15,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:15,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:16,082 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:16,082 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:16,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854781018] [2021-07-13 19:53:16,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854781018] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:16,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1919035935] [2021-07-13 19:53:16,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:16,113 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:53:16,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:16,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:16,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:16,192 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:16,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:16,194 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:16,205 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:16,206 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:16,206 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:26 [2021-07-13 19:53:16,349 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:16,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1919035935] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:16,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:16,350 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 16 [2021-07-13 19:53:16,350 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615215144] [2021-07-13 19:53:16,350 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-07-13 19:53:16,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:16,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-07-13 19:53:16,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:16,351 INFO L87 Difference]: Start difference. First operand 189 states and 530 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:17,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:17,214 INFO L93 Difference]: Finished difference Result 363 states and 1048 transitions. [2021-07-13 19:53:17,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-13 19:53:17,215 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:17,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:17,218 INFO L225 Difference]: With dead ends: 363 [2021-07-13 19:53:17,218 INFO L226 Difference]: Without dead ends: 353 [2021-07-13 19:53:17,218 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 727.1ms TimeCoverageRelationStatistics Valid=214, Invalid=976, Unknown=0, NotChecked=0, Total=1190 [2021-07-13 19:53:17,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-07-13 19:53:17,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 192. [2021-07-13 19:53:17,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 191 states have (on average 2.8219895287958114) internal successors, (539), 191 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:17,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 539 transitions. [2021-07-13 19:53:17,228 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 539 transitions. Word has length 20 [2021-07-13 19:53:17,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:17,229 INFO L482 AbstractCegarLoop]: Abstraction has 192 states and 539 transitions. [2021-07-13 19:53:17,229 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:17,229 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 539 transitions. [2021-07-13 19:53:17,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:17,230 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:17,230 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:17,444 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:17,445 INFO L430 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:17,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:17,445 INFO L82 PathProgramCache]: Analyzing trace with hash -409333331, now seen corresponding path program 4 times [2021-07-13 19:53:17,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:17,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17465077] [2021-07-13 19:53:17,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:17,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:17,616 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:17,616 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:17,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17465077] [2021-07-13 19:53:17,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17465077] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:17,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83529922] [2021-07-13 19:53:17,617 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:17,656 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:17,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:17,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:17,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:17,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:17,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:17,778 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:17,787 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:17,789 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:17,790 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:17,854 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:17,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [83529922] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:17,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:17,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:17,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241435590] [2021-07-13 19:53:17,855 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:17,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:17,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:17,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:17,856 INFO L87 Difference]: Start difference. First operand 192 states and 539 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:18,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:18,282 INFO L93 Difference]: Finished difference Result 310 states and 882 transitions. [2021-07-13 19:53:18,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-07-13 19:53:18,282 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:18,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:18,284 INFO L225 Difference]: With dead ends: 310 [2021-07-13 19:53:18,284 INFO L226 Difference]: Without dead ends: 298 [2021-07-13 19:53:18,285 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 393.4ms TimeCoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:53:18,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-07-13 19:53:18,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 210. [2021-07-13 19:53:18,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 2.875598086124402) internal successors, (601), 209 states have internal predecessors, (601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:18,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 601 transitions. [2021-07-13 19:53:18,291 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 601 transitions. Word has length 20 [2021-07-13 19:53:18,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:18,291 INFO L482 AbstractCegarLoop]: Abstraction has 210 states and 601 transitions. [2021-07-13 19:53:18,291 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:18,291 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 601 transitions. [2021-07-13 19:53:18,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:18,292 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:18,292 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:18,505 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:18,505 INFO L430 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:18,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:18,505 INFO L82 PathProgramCache]: Analyzing trace with hash -908838833, now seen corresponding path program 1 times [2021-07-13 19:53:18,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:18,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914852523] [2021-07-13 19:53:18,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:18,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:18,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:18,604 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:18,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914852523] [2021-07-13 19:53:18,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914852523] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:18,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672199060] [2021-07-13 19:53:18,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:18,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:18,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:18,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:18,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-07-13 19:53:18,740 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:18,745 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:18,745 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:18,746 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:19, output treesize:10 [2021-07-13 19:53:18,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:18,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672199060] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:18,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:18,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-07-13 19:53:18,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845013635] [2021-07-13 19:53:18,780 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:18,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:18,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:18,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:18,781 INFO L87 Difference]: Start difference. First operand 210 states and 601 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:19,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:19,250 INFO L93 Difference]: Finished difference Result 423 states and 1216 transitions. [2021-07-13 19:53:19,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-13 19:53:19,250 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:19,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:19,253 INFO L225 Difference]: With dead ends: 423 [2021-07-13 19:53:19,253 INFO L226 Difference]: Without dead ends: 414 [2021-07-13 19:53:19,253 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 255.4ms TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:53:19,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-07-13 19:53:19,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 216. [2021-07-13 19:53:19,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 215 states have (on average 2.8883720930232557) internal successors, (621), 215 states have internal predecessors, (621), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:19,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 621 transitions. [2021-07-13 19:53:19,260 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 621 transitions. Word has length 20 [2021-07-13 19:53:19,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:19,261 INFO L482 AbstractCegarLoop]: Abstraction has 216 states and 621 transitions. [2021-07-13 19:53:19,261 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:19,261 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 621 transitions. [2021-07-13 19:53:19,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:19,263 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:19,263 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:19,468 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-07-13 19:53:19,469 INFO L430 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:19,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:19,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1199871497, now seen corresponding path program 2 times [2021-07-13 19:53:19,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:19,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671684734] [2021-07-13 19:53:19,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:19,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:19,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:19,571 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:19,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671684734] [2021-07-13 19:53:19,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671684734] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:19,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049845163] [2021-07-13 19:53:19,572 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:19,611 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:19,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:19,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:19,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:19,762 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:19,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-07-13 19:53:19,763 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:19,771 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:19,772 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:19,773 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-07-13 19:53:19,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:19,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049845163] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:19,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:19,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:19,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449579942] [2021-07-13 19:53:19,806 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:19,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:19,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:19,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:19,807 INFO L87 Difference]: Start difference. First operand 216 states and 621 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:20,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:20,081 INFO L93 Difference]: Finished difference Result 332 states and 961 transitions. [2021-07-13 19:53:20,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-07-13 19:53:20,081 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:20,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:20,083 INFO L225 Difference]: With dead ends: 332 [2021-07-13 19:53:20,083 INFO L226 Difference]: Without dead ends: 323 [2021-07-13 19:53:20,084 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 231.6ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-07-13 19:53:20,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-07-13 19:53:20,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 219. [2021-07-13 19:53:20,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 218 states have (on average 2.8944954128440368) internal successors, (631), 218 states have internal predecessors, (631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:20,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 631 transitions. [2021-07-13 19:53:20,090 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 631 transitions. Word has length 20 [2021-07-13 19:53:20,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:20,091 INFO L482 AbstractCegarLoop]: Abstraction has 219 states and 631 transitions. [2021-07-13 19:53:20,091 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:20,091 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 631 transitions. [2021-07-13 19:53:20,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:20,092 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:20,092 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:20,314 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:20,315 INFO L430 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:20,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:20,315 INFO L82 PathProgramCache]: Analyzing trace with hash 2066945939, now seen corresponding path program 3 times [2021-07-13 19:53:20,315 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:20,315 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354924533] [2021-07-13 19:53:20,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:20,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:20,413 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:20,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:20,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354924533] [2021-07-13 19:53:20,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354924533] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:20,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72291502] [2021-07-13 19:53:20,413 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:20,450 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:53:20,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:20,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:20,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:20,558 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:20,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:20,561 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:20,575 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:20,584 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:20,584 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:38 [2021-07-13 19:53:20,723 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:20,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72291502] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:20,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:20,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 13 [2021-07-13 19:53:20,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602388043] [2021-07-13 19:53:20,724 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:20,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:20,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:20,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:20,724 INFO L87 Difference]: Start difference. First operand 219 states and 631 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:21,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:21,349 INFO L93 Difference]: Finished difference Result 343 states and 998 transitions. [2021-07-13 19:53:21,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-07-13 19:53:21,349 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:21,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:21,351 INFO L225 Difference]: With dead ends: 343 [2021-07-13 19:53:21,351 INFO L226 Difference]: Without dead ends: 334 [2021-07-13 19:53:21,352 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 506.6ms TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:53:21,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-07-13 19:53:21,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 222. [2021-07-13 19:53:21,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 2.9004524886877827) internal successors, (641), 221 states have internal predecessors, (641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:21,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 641 transitions. [2021-07-13 19:53:21,359 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 641 transitions. Word has length 20 [2021-07-13 19:53:21,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:21,359 INFO L482 AbstractCegarLoop]: Abstraction has 222 states and 641 transitions. [2021-07-13 19:53:21,359 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:21,359 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 641 transitions. [2021-07-13 19:53:21,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:21,360 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:21,360 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:21,572 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:21,573 INFO L430 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:21,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:21,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1904435179, now seen corresponding path program 4 times [2021-07-13 19:53:21,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:21,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531069066] [2021-07-13 19:53:21,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:21,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:21,656 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:21,656 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:21,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531069066] [2021-07-13 19:53:21,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531069066] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:21,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362370609] [2021-07-13 19:53:21,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:21,684 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:21,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:21,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:21,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:21,766 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:21,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:21,768 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:21,775 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:21,776 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:21,776 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:21,836 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:21,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362370609] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:21,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:21,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:21,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635393925] [2021-07-13 19:53:21,836 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:21,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:21,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:21,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:21,837 INFO L87 Difference]: Start difference. First operand 222 states and 641 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:22,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:22,112 INFO L93 Difference]: Finished difference Result 318 states and 927 transitions. [2021-07-13 19:53:22,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-07-13 19:53:22,112 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:22,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:22,114 INFO L225 Difference]: With dead ends: 318 [2021-07-13 19:53:22,114 INFO L226 Difference]: Without dead ends: 307 [2021-07-13 19:53:22,114 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 217.2ms TimeCoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:53:22,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2021-07-13 19:53:22,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 224. [2021-07-13 19:53:22,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 223 states have (on average 2.905829596412556) internal successors, (648), 223 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:22,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 648 transitions. [2021-07-13 19:53:22,121 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 648 transitions. Word has length 20 [2021-07-13 19:53:22,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:22,121 INFO L482 AbstractCegarLoop]: Abstraction has 224 states and 648 transitions. [2021-07-13 19:53:22,121 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:22,121 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 648 transitions. [2021-07-13 19:53:22,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:22,122 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:22,122 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:22,322 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-07-13 19:53:22,322 INFO L430 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:22,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:22,323 INFO L82 PathProgramCache]: Analyzing trace with hash -453703043, now seen corresponding path program 5 times [2021-07-13 19:53:22,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:22,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712346300] [2021-07-13 19:53:22,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:22,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:22,403 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:22,403 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:22,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712346300] [2021-07-13 19:53:22,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712346300] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:22,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602010620] [2021-07-13 19:53:22,403 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:22,435 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:22,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:22,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:22,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:22,558 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:22,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-07-13 19:53:22,560 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:22,567 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:22,569 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:22,569 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-07-13 19:53:22,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:22,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602010620] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:22,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:22,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:22,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108390297] [2021-07-13 19:53:22,599 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:22,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:22,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:22,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:22,599 INFO L87 Difference]: Start difference. First operand 224 states and 648 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:22,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:22,857 INFO L93 Difference]: Finished difference Result 328 states and 946 transitions. [2021-07-13 19:53:22,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:22,857 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:22,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:22,859 INFO L225 Difference]: With dead ends: 328 [2021-07-13 19:53:22,859 INFO L226 Difference]: Without dead ends: 318 [2021-07-13 19:53:22,859 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 208.9ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:22,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-07-13 19:53:22,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 224. [2021-07-13 19:53:22,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 223 states have (on average 2.905829596412556) internal successors, (648), 223 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:22,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 648 transitions. [2021-07-13 19:53:22,866 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 648 transitions. Word has length 20 [2021-07-13 19:53:22,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:22,866 INFO L482 AbstractCegarLoop]: Abstraction has 224 states and 648 transitions. [2021-07-13 19:53:22,866 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:22,866 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 648 transitions. [2021-07-13 19:53:22,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:22,867 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:22,867 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:23,080 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:23,081 INFO L430 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:23,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:23,081 INFO L82 PathProgramCache]: Analyzing trace with hash -236278157, now seen corresponding path program 6 times [2021-07-13 19:53:23,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:23,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981347780] [2021-07-13 19:53:23,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:23,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:23,190 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:23,191 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:23,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981347780] [2021-07-13 19:53:23,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981347780] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:23,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300703657] [2021-07-13 19:53:23,191 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:23,225 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:53:23,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:23,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:23,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:23,302 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:23,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:23,303 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:23,313 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:23,314 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:23,314 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:26 [2021-07-13 19:53:23,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:23,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300703657] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:23,424 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:23,424 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 16 [2021-07-13 19:53:23,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752961305] [2021-07-13 19:53:23,424 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-07-13 19:53:23,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:23,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-07-13 19:53:23,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:23,426 INFO L87 Difference]: Start difference. First operand 224 states and 648 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:24,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:24,273 INFO L93 Difference]: Finished difference Result 462 states and 1347 transitions. [2021-07-13 19:53:24,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 19:53:24,274 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:24,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:24,276 INFO L225 Difference]: With dead ends: 462 [2021-07-13 19:53:24,276 INFO L226 Difference]: Without dead ends: 442 [2021-07-13 19:53:24,277 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 703.0ms TimeCoverageRelationStatistics Valid=231, Invalid=959, Unknown=0, NotChecked=0, Total=1190 [2021-07-13 19:53:24,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2021-07-13 19:53:24,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 235. [2021-07-13 19:53:24,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 234 states have (on average 2.965811965811966) internal successors, (694), 234 states have internal predecessors, (694), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:24,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 694 transitions. [2021-07-13 19:53:24,284 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 694 transitions. Word has length 20 [2021-07-13 19:53:24,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:24,284 INFO L482 AbstractCegarLoop]: Abstraction has 235 states and 694 transitions. [2021-07-13 19:53:24,285 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:24,285 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 694 transitions. [2021-07-13 19:53:24,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:24,285 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:24,285 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:24,500 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-07-13 19:53:24,501 INFO L430 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:24,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:24,501 INFO L82 PathProgramCache]: Analyzing trace with hash 188465799, now seen corresponding path program 5 times [2021-07-13 19:53:24,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:24,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070328978] [2021-07-13 19:53:24,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:24,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:24,593 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:24,594 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:24,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070328978] [2021-07-13 19:53:24,594 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070328978] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:24,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786045361] [2021-07-13 19:53:24,594 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:24,625 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:24,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:24,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:24,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:24,769 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:24,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-07-13 19:53:24,771 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:24,777 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:24,778 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:24,778 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-07-13 19:53:24,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:24,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786045361] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:24,807 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:24,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:24,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090090838] [2021-07-13 19:53:24,808 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:24,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:24,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:24,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:24,808 INFO L87 Difference]: Start difference. First operand 235 states and 694 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:25,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:25,108 INFO L93 Difference]: Finished difference Result 327 states and 955 transitions. [2021-07-13 19:53:25,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:25,108 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:25,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:25,110 INFO L225 Difference]: With dead ends: 327 [2021-07-13 19:53:25,110 INFO L226 Difference]: Without dead ends: 318 [2021-07-13 19:53:25,110 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 183.1ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:25,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-07-13 19:53:25,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 238. [2021-07-13 19:53:25,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 237 states have (on average 2.970464135021097) internal successors, (704), 237 states have internal predecessors, (704), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:25,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 704 transitions. [2021-07-13 19:53:25,118 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 704 transitions. Word has length 20 [2021-07-13 19:53:25,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:25,118 INFO L482 AbstractCegarLoop]: Abstraction has 238 states and 704 transitions. [2021-07-13 19:53:25,118 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:25,118 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 704 transitions. [2021-07-13 19:53:25,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:25,119 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:25,119 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:25,332 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:25,333 INFO L430 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:25,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:25,333 INFO L82 PathProgramCache]: Analyzing trace with hash -839684061, now seen corresponding path program 6 times [2021-07-13 19:53:25,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:25,333 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466277785] [2021-07-13 19:53:25,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:25,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:25,401 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:25,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:25,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466277785] [2021-07-13 19:53:25,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466277785] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:25,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249380084] [2021-07-13 19:53:25,403 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:25,450 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:53:25,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:25,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:25,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:25,534 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:25,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:25,535 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:25,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:25,553 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:25,553 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:38 [2021-07-13 19:53:25,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:25,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249380084] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:25,675 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:25,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 13 [2021-07-13 19:53:25,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592854124] [2021-07-13 19:53:25,676 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:25,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:25,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:25,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:25,677 INFO L87 Difference]: Start difference. First operand 238 states and 704 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:26,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:26,165 INFO L93 Difference]: Finished difference Result 341 states and 1001 transitions. [2021-07-13 19:53:26,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-07-13 19:53:26,165 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:26,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:26,166 INFO L225 Difference]: With dead ends: 341 [2021-07-13 19:53:26,167 INFO L226 Difference]: Without dead ends: 332 [2021-07-13 19:53:26,167 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 502.3ms TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:53:26,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-07-13 19:53:26,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 241. [2021-07-13 19:53:26,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 2.975) internal successors, (714), 240 states have internal predecessors, (714), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:26,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 714 transitions. [2021-07-13 19:53:26,173 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 714 transitions. Word has length 20 [2021-07-13 19:53:26,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:26,173 INFO L482 AbstractCegarLoop]: Abstraction has 241 states and 714 transitions. [2021-07-13 19:53:26,173 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:26,173 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 714 transitions. [2021-07-13 19:53:26,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:26,174 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:26,174 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:26,389 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-07-13 19:53:26,389 INFO L430 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:26,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:26,389 INFO L82 PathProgramCache]: Analyzing trace with hash -516097883, now seen corresponding path program 7 times [2021-07-13 19:53:26,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:26,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105773557] [2021-07-13 19:53:26,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:26,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:26,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:26,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:26,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105773557] [2021-07-13 19:53:26,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105773557] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:26,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991490394] [2021-07-13 19:53:26,474 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:26,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:26,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:26,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:26,588 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:26,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:26,590 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:26,598 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:26,599 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:26,599 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:26,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:26,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [991490394] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:26,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:26,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:26,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878180627] [2021-07-13 19:53:26,649 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:26,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:26,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:26,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:26,649 INFO L87 Difference]: Start difference. First operand 241 states and 714 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:26,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:26,840 INFO L93 Difference]: Finished difference Result 310 states and 911 transitions. [2021-07-13 19:53:26,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-13 19:53:26,841 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:26,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:26,845 INFO L225 Difference]: With dead ends: 310 [2021-07-13 19:53:26,845 INFO L226 Difference]: Without dead ends: 299 [2021-07-13 19:53:26,845 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 180.9ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:26,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-07-13 19:53:26,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 235. [2021-07-13 19:53:26,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 234 states have (on average 2.965811965811966) internal successors, (694), 234 states have internal predecessors, (694), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:26,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 694 transitions. [2021-07-13 19:53:26,851 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 694 transitions. Word has length 20 [2021-07-13 19:53:26,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:26,851 INFO L482 AbstractCegarLoop]: Abstraction has 235 states and 694 transitions. [2021-07-13 19:53:26,851 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:26,851 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 694 transitions. [2021-07-13 19:53:26,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:26,852 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:26,852 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:27,068 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-07-13 19:53:27,069 INFO L430 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:27,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:27,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1628624025, now seen corresponding path program 7 times [2021-07-13 19:53:27,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:27,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740859873] [2021-07-13 19:53:27,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:27,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:27,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:27,174 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:27,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740859873] [2021-07-13 19:53:27,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740859873] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:27,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12464413] [2021-07-13 19:53:27,174 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:27,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:27,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:27,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:27,258 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:27,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:27,260 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:27,267 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:27,268 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:27,268 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:27,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:27,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12464413] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:27,316 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:27,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:27,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132992284] [2021-07-13 19:53:27,317 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:27,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:27,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:27,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:27,318 INFO L87 Difference]: Start difference. First operand 235 states and 694 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:27,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:27,532 INFO L93 Difference]: Finished difference Result 350 states and 1025 transitions. [2021-07-13 19:53:27,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-07-13 19:53:27,533 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:27,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:27,534 INFO L225 Difference]: With dead ends: 350 [2021-07-13 19:53:27,534 INFO L226 Difference]: Without dead ends: 340 [2021-07-13 19:53:27,534 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 208.9ms TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:27,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-07-13 19:53:27,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 246. [2021-07-13 19:53:27,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 245 states have (on average 3.012244897959184) internal successors, (738), 245 states have internal predecessors, (738), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:27,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 738 transitions. [2021-07-13 19:53:27,542 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 738 transitions. Word has length 20 [2021-07-13 19:53:27,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:27,542 INFO L482 AbstractCegarLoop]: Abstraction has 246 states and 738 transitions. [2021-07-13 19:53:27,542 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:27,542 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 738 transitions. [2021-07-13 19:53:27,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:27,543 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:27,543 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:27,743 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-07-13 19:53:27,743 INFO L430 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:27,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:27,744 INFO L82 PathProgramCache]: Analyzing trace with hash -162237149, now seen corresponding path program 8 times [2021-07-13 19:53:27,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:27,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820331252] [2021-07-13 19:53:27,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:27,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:27,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:27,855 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:27,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820331252] [2021-07-13 19:53:27,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820331252] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:27,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96271036] [2021-07-13 19:53:27,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:27,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:27,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:27,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:27,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:27,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:27,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:27,947 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:27,954 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:27,956 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:27,956 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:27,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:28,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96271036] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:28,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:28,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:28,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100030199] [2021-07-13 19:53:28,000 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:28,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:28,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:28,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:28,001 INFO L87 Difference]: Start difference. First operand 246 states and 738 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:28,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:28,239 INFO L93 Difference]: Finished difference Result 351 states and 1041 transitions. [2021-07-13 19:53:28,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-07-13 19:53:28,239 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:28,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:28,241 INFO L225 Difference]: With dead ends: 351 [2021-07-13 19:53:28,241 INFO L226 Difference]: Without dead ends: 339 [2021-07-13 19:53:28,241 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 214.6ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:28,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2021-07-13 19:53:28,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 256. [2021-07-13 19:53:28,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 255 states have (on average 3.062745098039216) internal successors, (781), 255 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:28,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 781 transitions. [2021-07-13 19:53:28,248 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 781 transitions. Word has length 20 [2021-07-13 19:53:28,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:28,248 INFO L482 AbstractCegarLoop]: Abstraction has 256 states and 781 transitions. [2021-07-13 19:53:28,248 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:28,248 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 781 transitions. [2021-07-13 19:53:28,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:28,249 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:28,249 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:28,476 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-07-13 19:53:28,476 INFO L430 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:28,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:28,477 INFO L82 PathProgramCache]: Analyzing trace with hash -428870833, now seen corresponding path program 8 times [2021-07-13 19:53:28,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:28,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715357998] [2021-07-13 19:53:28,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:28,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:28,552 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:28,552 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:28,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715357998] [2021-07-13 19:53:28,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1715357998] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:28,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998840387] [2021-07-13 19:53:28,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:28,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:28,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:28,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:28,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:28,633 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:28,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:28,634 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:28,643 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:28,645 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:28,645 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:28,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:28,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998840387] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:28,704 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:28,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:28,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136884044] [2021-07-13 19:53:28,704 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:28,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:28,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:28,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:28,705 INFO L87 Difference]: Start difference. First operand 256 states and 781 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:28,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:28,853 INFO L93 Difference]: Finished difference Result 333 states and 1000 transitions. [2021-07-13 19:53:28,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-07-13 19:53:28,853 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:28,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:28,854 INFO L225 Difference]: With dead ends: 333 [2021-07-13 19:53:28,854 INFO L226 Difference]: Without dead ends: 324 [2021-07-13 19:53:28,855 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 167.5ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-07-13 19:53:28,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-07-13 19:53:28,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 259. [2021-07-13 19:53:28,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 258 states have (on average 3.065891472868217) internal successors, (791), 258 states have internal predecessors, (791), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:28,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 791 transitions. [2021-07-13 19:53:28,860 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 791 transitions. Word has length 20 [2021-07-13 19:53:28,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:28,861 INFO L482 AbstractCegarLoop]: Abstraction has 259 states and 791 transitions. [2021-07-13 19:53:28,861 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:28,861 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 791 transitions. [2021-07-13 19:53:28,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:28,862 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:28,862 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:29,076 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:29,077 INFO L430 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:29,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:29,077 INFO L82 PathProgramCache]: Analyzing trace with hash -105284655, now seen corresponding path program 9 times [2021-07-13 19:53:29,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:29,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031507608] [2021-07-13 19:53:29,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:29,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:29,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:29,176 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:29,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031507608] [2021-07-13 19:53:29,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2031507608] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:29,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242458721] [2021-07-13 19:53:29,177 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:29,211 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:53:29,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:29,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:29,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:29,271 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:29,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:29,272 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:29,282 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:29,283 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:29,283 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:26 [2021-07-13 19:53:29,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:29,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242458721] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:29,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:29,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 15 [2021-07-13 19:53:29,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062508308] [2021-07-13 19:53:29,435 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-07-13 19:53:29,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:29,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-07-13 19:53:29,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:29,436 INFO L87 Difference]: Start difference. First operand 259 states and 791 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:30,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:30,085 INFO L93 Difference]: Finished difference Result 353 states and 1060 transitions. [2021-07-13 19:53:30,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-07-13 19:53:30,085 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:30,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:30,087 INFO L225 Difference]: With dead ends: 353 [2021-07-13 19:53:30,087 INFO L226 Difference]: Without dead ends: 340 [2021-07-13 19:53:30,087 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 591.4ms TimeCoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-07-13 19:53:30,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-07-13 19:53:30,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 256. [2021-07-13 19:53:30,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 255 states have (on average 3.062745098039216) internal successors, (781), 255 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:30,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 781 transitions. [2021-07-13 19:53:30,093 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 781 transitions. Word has length 20 [2021-07-13 19:53:30,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:30,093 INFO L482 AbstractCegarLoop]: Abstraction has 256 states and 781 transitions. [2021-07-13 19:53:30,093 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:30,093 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 781 transitions. [2021-07-13 19:53:30,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:30,094 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:30,094 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:30,316 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-07-13 19:53:30,317 INFO L430 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:30,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:30,317 INFO L82 PathProgramCache]: Analyzing trace with hash 431638013, now seen corresponding path program 9 times [2021-07-13 19:53:30,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:30,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823132930] [2021-07-13 19:53:30,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:30,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:30,401 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:30,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:30,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823132930] [2021-07-13 19:53:30,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823132930] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:30,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962202005] [2021-07-13 19:53:30,402 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:30,429 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:53:30,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:30,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:30,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:30,527 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:30,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:30,528 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:30,539 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:30,540 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:30,540 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:23 [2021-07-13 19:53:30,659 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:30,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962202005] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:30,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:30,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 15 [2021-07-13 19:53:30,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267253613] [2021-07-13 19:53:30,659 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-07-13 19:53:30,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:30,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-07-13 19:53:30,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:30,660 INFO L87 Difference]: Start difference. First operand 256 states and 781 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:31,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:31,606 INFO L93 Difference]: Finished difference Result 485 states and 1380 transitions. [2021-07-13 19:53:31,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-13 19:53:31,606 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:31,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:31,608 INFO L225 Difference]: With dead ends: 485 [2021-07-13 19:53:31,608 INFO L226 Difference]: Without dead ends: 458 [2021-07-13 19:53:31,608 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 740.0ms TimeCoverageRelationStatistics Valid=162, Invalid=830, Unknown=0, NotChecked=0, Total=992 [2021-07-13 19:53:31,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2021-07-13 19:53:31,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 293. [2021-07-13 19:53:31,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 3.095890410958904) internal successors, (904), 292 states have internal predecessors, (904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:31,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 904 transitions. [2021-07-13 19:53:31,623 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 904 transitions. Word has length 20 [2021-07-13 19:53:31,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:31,624 INFO L482 AbstractCegarLoop]: Abstraction has 293 states and 904 transitions. [2021-07-13 19:53:31,624 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:31,624 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 904 transitions. [2021-07-13 19:53:31,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:31,626 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:31,626 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:31,849 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-07-13 19:53:31,849 INFO L430 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:31,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:31,849 INFO L82 PathProgramCache]: Analyzing trace with hash 226719879, now seen corresponding path program 10 times [2021-07-13 19:53:31,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:31,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475060135] [2021-07-13 19:53:31,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:31,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:31,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:31,943 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:31,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475060135] [2021-07-13 19:53:31,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475060135] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:31,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492901116] [2021-07-13 19:53:31,943 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:31,969 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:31,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:31,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:31,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:32,032 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:32,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:32,034 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:32,039 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:32,040 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:32,041 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:23, output treesize:10 [2021-07-13 19:53:32,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:32,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492901116] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:32,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:32,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:32,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423330543] [2021-07-13 19:53:32,098 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:32,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:32,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:32,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:32,099 INFO L87 Difference]: Start difference. First operand 293 states and 904 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:32,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:32,346 INFO L93 Difference]: Finished difference Result 371 states and 1128 transitions. [2021-07-13 19:53:32,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-07-13 19:53:32,346 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:32,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:32,348 INFO L225 Difference]: With dead ends: 371 [2021-07-13 19:53:32,348 INFO L226 Difference]: Without dead ends: 360 [2021-07-13 19:53:32,349 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 192.4ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-07-13 19:53:32,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-07-13 19:53:32,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 295. [2021-07-13 19:53:32,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 294 states have (on average 3.0884353741496597) internal successors, (908), 294 states have internal predecessors, (908), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:32,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 908 transitions. [2021-07-13 19:53:32,355 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 908 transitions. Word has length 20 [2021-07-13 19:53:32,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:32,355 INFO L482 AbstractCegarLoop]: Abstraction has 295 states and 908 transitions. [2021-07-13 19:53:32,355 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:32,355 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 908 transitions. [2021-07-13 19:53:32,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:32,356 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:32,356 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:32,557 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:32,557 INFO L430 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:32,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:32,557 INFO L82 PathProgramCache]: Analyzing trace with hash 2027400643, now seen corresponding path program 10 times [2021-07-13 19:53:32,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:32,557 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899598973] [2021-07-13 19:53:32,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:32,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:32,646 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:32,646 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:32,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899598973] [2021-07-13 19:53:32,646 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899598973] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:32,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900410619] [2021-07-13 19:53:32,646 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:32,673 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:32,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:32,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:32,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:32,765 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:32,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:32,767 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:32,774 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:32,775 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:32,775 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:23, output treesize:10 [2021-07-13 19:53:32,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:32,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900410619] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:32,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:32,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:32,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718664960] [2021-07-13 19:53:32,806 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:32,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:32,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:32,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:32,807 INFO L87 Difference]: Start difference. First operand 295 states and 908 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:32,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:32,988 INFO L93 Difference]: Finished difference Result 412 states and 1240 transitions. [2021-07-13 19:53:32,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:32,989 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:32,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:32,990 INFO L225 Difference]: With dead ends: 412 [2021-07-13 19:53:32,990 INFO L226 Difference]: Without dead ends: 402 [2021-07-13 19:53:32,990 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 206.6ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:32,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-07-13 19:53:32,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 298. [2021-07-13 19:53:32,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 297 states have (on average 3.0875420875420874) internal successors, (917), 297 states have internal predecessors, (917), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:32,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 917 transitions. [2021-07-13 19:53:32,996 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 917 transitions. Word has length 20 [2021-07-13 19:53:32,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:32,996 INFO L482 AbstractCegarLoop]: Abstraction has 298 states and 917 transitions. [2021-07-13 19:53:32,996 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:32,996 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 917 transitions. [2021-07-13 19:53:32,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:32,997 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:32,997 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:33,197 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-07-13 19:53:33,197 INFO L430 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:33,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:33,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1645911141, now seen corresponding path program 11 times [2021-07-13 19:53:33,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:33,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146432536] [2021-07-13 19:53:33,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:33,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:33,303 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:33,304 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:33,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146432536] [2021-07-13 19:53:33,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146432536] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:33,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311747585] [2021-07-13 19:53:33,304 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:33,337 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:33,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:33,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:33,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:33,435 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:33,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:33,437 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:33,446 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:33,448 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:33,448 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:28, output treesize:10 [2021-07-13 19:53:33,499 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:33,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311747585] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:33,499 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:33,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2021-07-13 19:53:33,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42495334] [2021-07-13 19:53:33,500 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-07-13 19:53:33,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:33,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-07-13 19:53:33,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:33,500 INFO L87 Difference]: Start difference. First operand 298 states and 917 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:33,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:33,893 INFO L93 Difference]: Finished difference Result 460 states and 1382 transitions. [2021-07-13 19:53:33,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-07-13 19:53:33,893 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:33,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:33,895 INFO L225 Difference]: With dead ends: 460 [2021-07-13 19:53:33,895 INFO L226 Difference]: Without dead ends: 450 [2021-07-13 19:53:33,895 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 405.2ms TimeCoverageRelationStatistics Valid=132, Invalid=518, Unknown=0, NotChecked=0, Total=650 [2021-07-13 19:53:33,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2021-07-13 19:53:33,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 298. [2021-07-13 19:53:33,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 297 states have (on average 3.0875420875420874) internal successors, (917), 297 states have internal predecessors, (917), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:33,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 917 transitions. [2021-07-13 19:53:33,902 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 917 transitions. Word has length 20 [2021-07-13 19:53:33,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:33,902 INFO L482 AbstractCegarLoop]: Abstraction has 298 states and 917 transitions. [2021-07-13 19:53:33,902 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:33,903 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 917 transitions. [2021-07-13 19:53:33,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:33,903 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:33,904 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:34,116 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:34,117 INFO L430 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:34,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:34,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1815317715, now seen corresponding path program 12 times [2021-07-13 19:53:34,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:34,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044410768] [2021-07-13 19:53:34,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:34,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:34,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-07-13 19:53:34,214 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:34,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044410768] [2021-07-13 19:53:34,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044410768] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:34,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55202047] [2021-07-13 19:53:34,214 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:34,241 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:53:34,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:34,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:34,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:34,309 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:34,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:34,310 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:34,319 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:34,324 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:34,324 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:26 [2021-07-13 19:53:34,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:34,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55202047] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:34,456 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:34,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 15 [2021-07-13 19:53:34,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931283359] [2021-07-13 19:53:34,456 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-07-13 19:53:34,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:34,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-07-13 19:53:34,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:34,457 INFO L87 Difference]: Start difference. First operand 298 states and 917 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:35,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:35,209 INFO L93 Difference]: Finished difference Result 552 states and 1617 transitions. [2021-07-13 19:53:35,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:53:35,210 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:35,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:35,212 INFO L225 Difference]: With dead ends: 552 [2021-07-13 19:53:35,212 INFO L226 Difference]: Without dead ends: 520 [2021-07-13 19:53:35,212 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 667.4ms TimeCoverageRelationStatistics Valid=215, Invalid=777, Unknown=0, NotChecked=0, Total=992 [2021-07-13 19:53:35,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-07-13 19:53:35,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 306. [2021-07-13 19:53:35,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 305 states have (on average 3.1180327868852458) internal successors, (951), 305 states have internal predecessors, (951), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:35,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 951 transitions. [2021-07-13 19:53:35,219 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 951 transitions. Word has length 20 [2021-07-13 19:53:35,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:35,219 INFO L482 AbstractCegarLoop]: Abstraction has 306 states and 951 transitions. [2021-07-13 19:53:35,219 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:35,219 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 951 transitions. [2021-07-13 19:53:35,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:35,220 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:35,220 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:35,424 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-07-13 19:53:35,424 INFO L430 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:35,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:35,424 INFO L82 PathProgramCache]: Analyzing trace with hash -1895521031, now seen corresponding path program 11 times [2021-07-13 19:53:35,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:35,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397760510] [2021-07-13 19:53:35,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:35,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:35,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:35,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:35,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397760510] [2021-07-13 19:53:35,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397760510] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:35,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224783246] [2021-07-13 19:53:35,505 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:35,544 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:35,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:35,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:35,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:35,626 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:35,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:35,628 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:35,635 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:35,636 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:35,636 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:23, output treesize:10 [2021-07-13 19:53:35,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:35,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224783246] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:35,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:35,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:35,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973313715] [2021-07-13 19:53:35,673 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:35,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:35,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:35,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:35,674 INFO L87 Difference]: Start difference. First operand 306 states and 951 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:35,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:35,921 INFO L93 Difference]: Finished difference Result 408 states and 1237 transitions. [2021-07-13 19:53:35,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:35,922 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:35,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:35,924 INFO L225 Difference]: With dead ends: 408 [2021-07-13 19:53:35,924 INFO L226 Difference]: Without dead ends: 399 [2021-07-13 19:53:35,924 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 202.3ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:35,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-07-13 19:53:35,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 309. [2021-07-13 19:53:35,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 3.1201298701298703) internal successors, (961), 308 states have internal predecessors, (961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:35,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 961 transitions. [2021-07-13 19:53:35,930 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 961 transitions. Word has length 20 [2021-07-13 19:53:35,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:35,931 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 961 transitions. [2021-07-13 19:53:35,931 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:35,931 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 961 transitions. [2021-07-13 19:53:35,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:35,932 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:35,932 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:36,136 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-07-13 19:53:36,137 INFO L430 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:36,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:36,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1371296405, now seen corresponding path program 12 times [2021-07-13 19:53:36,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:36,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707228842] [2021-07-13 19:53:36,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:36,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:36,227 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:36,227 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:36,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707228842] [2021-07-13 19:53:36,227 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707228842] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:36,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165157345] [2021-07-13 19:53:36,227 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:36,257 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:53:36,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:36,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:36,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:36,314 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:36,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:36,320 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:36,328 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:36,328 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:36,328 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:21 [2021-07-13 19:53:36,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:36,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165157345] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:36,419 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:36,419 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 14 [2021-07-13 19:53:36,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206373456] [2021-07-13 19:53:36,419 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-07-13 19:53:36,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:36,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-07-13 19:53:36,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-07-13 19:53:36,420 INFO L87 Difference]: Start difference. First operand 309 states and 961 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:36,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:36,786 INFO L93 Difference]: Finished difference Result 429 states and 1298 transitions. [2021-07-13 19:53:36,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-07-13 19:53:36,786 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:36,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:36,788 INFO L225 Difference]: With dead ends: 429 [2021-07-13 19:53:36,788 INFO L226 Difference]: Without dead ends: 420 [2021-07-13 19:53:36,788 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 359.7ms TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:53:36,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2021-07-13 19:53:36,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 312. [2021-07-13 19:53:36,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 3.122186495176849) internal successors, (971), 311 states have internal predecessors, (971), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:36,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 971 transitions. [2021-07-13 19:53:36,795 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 971 transitions. Word has length 20 [2021-07-13 19:53:36,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:36,795 INFO L482 AbstractCegarLoop]: Abstraction has 312 states and 971 transitions. [2021-07-13 19:53:36,795 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:36,795 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 971 transitions. [2021-07-13 19:53:36,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:36,796 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:36,796 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:37,018 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-07-13 19:53:37,019 INFO L430 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:37,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:37,019 INFO L82 PathProgramCache]: Analyzing trace with hash 1694882583, now seen corresponding path program 13 times [2021-07-13 19:53:37,019 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:37,019 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588341923] [2021-07-13 19:53:37,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:37,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:37,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:37,077 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:37,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588341923] [2021-07-13 19:53:37,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588341923] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:37,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589048443] [2021-07-13 19:53:37,078 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:37,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:37,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:37,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:37,159 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:37,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:37,161 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:37,169 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:37,170 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:37,170 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:37,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:37,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589048443] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:37,216 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:37,216 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:37,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323776913] [2021-07-13 19:53:37,217 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:37,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:37,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:37,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:37,217 INFO L87 Difference]: Start difference. First operand 312 states and 971 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:37,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:37,410 INFO L93 Difference]: Finished difference Result 391 states and 1193 transitions. [2021-07-13 19:53:37,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-13 19:53:37,410 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:37,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:37,412 INFO L225 Difference]: With dead ends: 391 [2021-07-13 19:53:37,412 INFO L226 Difference]: Without dead ends: 380 [2021-07-13 19:53:37,412 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 159.8ms TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:37,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2021-07-13 19:53:37,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 306. [2021-07-13 19:53:37,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 305 states have (on average 3.1180327868852458) internal successors, (951), 305 states have internal predecessors, (951), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:37,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 951 transitions. [2021-07-13 19:53:37,418 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 951 transitions. Word has length 20 [2021-07-13 19:53:37,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:37,418 INFO L482 AbstractCegarLoop]: Abstraction has 306 states and 951 transitions. [2021-07-13 19:53:37,418 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:37,418 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 951 transitions. [2021-07-13 19:53:37,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:37,419 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:37,419 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:37,621 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-07-13 19:53:37,621 INFO L430 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:37,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:37,621 INFO L82 PathProgramCache]: Analyzing trace with hash -455362805, now seen corresponding path program 13 times [2021-07-13 19:53:37,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:37,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249884045] [2021-07-13 19:53:37,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:37,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:37,717 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:37,717 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:37,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249884045] [2021-07-13 19:53:37,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249884045] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:37,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175865156] [2021-07-13 19:53:37,718 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:37,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:37,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:37,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:37,811 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:37,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:37,812 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:37,822 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:37,823 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:37,823 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:37,893 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:37,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175865156] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:37,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:37,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:37,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021385857] [2021-07-13 19:53:37,894 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:37,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:37,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:37,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:37,894 INFO L87 Difference]: Start difference. First operand 306 states and 951 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:38,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:38,129 INFO L93 Difference]: Finished difference Result 431 states and 1307 transitions. [2021-07-13 19:53:38,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-07-13 19:53:38,129 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:38,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:38,131 INFO L225 Difference]: With dead ends: 431 [2021-07-13 19:53:38,131 INFO L226 Difference]: Without dead ends: 421 [2021-07-13 19:53:38,131 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 229.7ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-07-13 19:53:38,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-07-13 19:53:38,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 309. [2021-07-13 19:53:38,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 3.1136363636363638) internal successors, (959), 308 states have internal predecessors, (959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:38,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 959 transitions. [2021-07-13 19:53:38,138 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 959 transitions. Word has length 20 [2021-07-13 19:53:38,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:38,139 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 959 transitions. [2021-07-13 19:53:38,139 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:38,139 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 959 transitions. [2021-07-13 19:53:38,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:38,140 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:38,140 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:38,365 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-07-13 19:53:38,365 INFO L430 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:38,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:38,365 INFO L82 PathProgramCache]: Analyzing trace with hash 2048743317, now seen corresponding path program 14 times [2021-07-13 19:53:38,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:38,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494290863] [2021-07-13 19:53:38,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:38,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:38,470 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:38,470 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:38,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494290863] [2021-07-13 19:53:38,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [494290863] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:38,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757084668] [2021-07-13 19:53:38,470 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:38,499 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:38,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:38,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:38,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:38,556 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:38,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:38,557 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:38,567 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:38,569 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:38,569 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:38,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:38,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [757084668] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:38,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:38,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:38,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992719160] [2021-07-13 19:53:38,619 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:38,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:38,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:38,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:38,619 INFO L87 Difference]: Start difference. First operand 309 states and 959 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:38,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:38,911 INFO L93 Difference]: Finished difference Result 424 states and 1287 transitions. [2021-07-13 19:53:38,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-07-13 19:53:38,912 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:38,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:38,913 INFO L225 Difference]: With dead ends: 424 [2021-07-13 19:53:38,913 INFO L226 Difference]: Without dead ends: 412 [2021-07-13 19:53:38,913 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 207.2ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:38,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2021-07-13 19:53:38,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 309. [2021-07-13 19:53:38,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 3.1136363636363638) internal successors, (959), 308 states have internal predecessors, (959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:38,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 959 transitions. [2021-07-13 19:53:38,922 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 959 transitions. Word has length 20 [2021-07-13 19:53:38,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:38,922 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 959 transitions. [2021-07-13 19:53:38,922 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:38,922 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 959 transitions. [2021-07-13 19:53:38,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:38,923 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:38,923 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:39,145 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:39,146 INFO L430 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:39,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:39,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1782109633, now seen corresponding path program 14 times [2021-07-13 19:53:39,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:39,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027814982] [2021-07-13 19:53:39,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:39,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:39,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:39,228 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:39,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027814982] [2021-07-13 19:53:39,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027814982] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:39,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [992679439] [2021-07-13 19:53:39,229 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:39,259 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:39,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:39,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:39,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:39,327 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:39,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:39,328 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:39,337 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:39,338 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:39,338 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:39,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:39,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [992679439] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:39,388 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:39,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:39,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45834333] [2021-07-13 19:53:39,388 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:39,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:39,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:39,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:39,389 INFO L87 Difference]: Start difference. First operand 309 states and 959 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:39,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:39,564 INFO L93 Difference]: Finished difference Result 398 states and 1210 transitions. [2021-07-13 19:53:39,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-13 19:53:39,564 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:39,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:39,565 INFO L225 Difference]: With dead ends: 398 [2021-07-13 19:53:39,565 INFO L226 Difference]: Without dead ends: 389 [2021-07-13 19:53:39,566 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 182.3ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:39,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-07-13 19:53:39,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 312. [2021-07-13 19:53:39,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 3.1157556270096465) internal successors, (969), 311 states have internal predecessors, (969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:39,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 969 transitions. [2021-07-13 19:53:39,570 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 969 transitions. Word has length 20 [2021-07-13 19:53:39,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:39,570 INFO L482 AbstractCegarLoop]: Abstraction has 312 states and 969 transitions. [2021-07-13 19:53:39,570 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:39,570 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 969 transitions. [2021-07-13 19:53:39,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:39,571 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:39,571 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:39,772 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:39,773 INFO L430 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:39,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:39,773 INFO L82 PathProgramCache]: Analyzing trace with hash 2105695811, now seen corresponding path program 15 times [2021-07-13 19:53:39,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:39,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289373897] [2021-07-13 19:53:39,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:39,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:39,851 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:39,852 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:39,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289373897] [2021-07-13 19:53:39,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289373897] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:39,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591759859] [2021-07-13 19:53:39,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:39,885 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:53:39,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:39,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:39,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:39,951 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:39,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:39,952 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:39,962 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:39,963 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:39,963 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:26 [2021-07-13 19:53:40,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:40,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591759859] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:40,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:40,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 15 [2021-07-13 19:53:40,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707495129] [2021-07-13 19:53:40,104 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-07-13 19:53:40,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:40,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-07-13 19:53:40,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:40,105 INFO L87 Difference]: Start difference. First operand 312 states and 969 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:41,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:41,018 INFO L93 Difference]: Finished difference Result 464 states and 1400 transitions. [2021-07-13 19:53:41,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:53:41,018 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:41,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:41,020 INFO L225 Difference]: With dead ends: 464 [2021-07-13 19:53:41,020 INFO L226 Difference]: Without dead ends: 451 [2021-07-13 19:53:41,020 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 770.3ms TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2021-07-13 19:53:41,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 451 states. [2021-07-13 19:53:41,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 451 to 309. [2021-07-13 19:53:41,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 3.1136363636363638) internal successors, (959), 308 states have internal predecessors, (959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:41,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 959 transitions. [2021-07-13 19:53:41,027 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 959 transitions. Word has length 20 [2021-07-13 19:53:41,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:41,027 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 959 transitions. [2021-07-13 19:53:41,027 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:41,027 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 959 transitions. [2021-07-13 19:53:41,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:41,028 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:41,028 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:41,250 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-07-13 19:53:41,250 INFO L430 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:41,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:41,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1652348817, now seen corresponding path program 15 times [2021-07-13 19:53:41,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:41,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231835487] [2021-07-13 19:53:41,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:41,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:41,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:41,344 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:41,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231835487] [2021-07-13 19:53:41,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231835487] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:41,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687164253] [2021-07-13 19:53:41,344 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:41,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:53:41,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:41,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:41,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:41,456 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:41,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:41,457 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:41,465 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:41,465 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:41,466 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:23 [2021-07-13 19:53:41,568 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:41,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687164253] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:41,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:41,569 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 15 [2021-07-13 19:53:41,569 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941584876] [2021-07-13 19:53:41,569 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-07-13 19:53:41,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:41,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-07-13 19:53:41,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:41,569 INFO L87 Difference]: Start difference. First operand 309 states and 959 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:42,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:42,835 INFO L93 Difference]: Finished difference Result 598 states and 1728 transitions. [2021-07-13 19:53:42,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-13 19:53:42,836 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:42,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:42,837 INFO L225 Difference]: With dead ends: 598 [2021-07-13 19:53:42,838 INFO L226 Difference]: Without dead ends: 571 [2021-07-13 19:53:42,838 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 972.7ms TimeCoverageRelationStatistics Valid=223, Invalid=1259, Unknown=0, NotChecked=0, Total=1482 [2021-07-13 19:53:42,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-07-13 19:53:42,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 313. [2021-07-13 19:53:42,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 312 states have (on average 3.1121794871794872) internal successors, (971), 312 states have internal predecessors, (971), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:42,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 971 transitions. [2021-07-13 19:53:42,847 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 971 transitions. Word has length 20 [2021-07-13 19:53:42,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:42,847 INFO L482 AbstractCegarLoop]: Abstraction has 313 states and 971 transitions. [2021-07-13 19:53:42,847 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:42,847 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 971 transitions. [2021-07-13 19:53:42,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:42,848 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:42,848 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:43,068 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:43,069 INFO L430 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:43,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:43,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1857266951, now seen corresponding path program 16 times [2021-07-13 19:53:43,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:43,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169565980] [2021-07-13 19:53:43,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:43,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:43,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:43,154 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:43,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169565980] [2021-07-13 19:53:43,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169565980] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:43,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431143714] [2021-07-13 19:53:43,155 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:43,180 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:43,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:43,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:43,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:43,265 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:43,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-07-13 19:53:43,267 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:43,273 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:43,274 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:43,274 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-07-13 19:53:43,308 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:43,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431143714] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:43,308 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:43,308 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:43,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502213514] [2021-07-13 19:53:43,309 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:43,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:43,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:43,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:43,309 INFO L87 Difference]: Start difference. First operand 313 states and 971 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:43,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:43,514 INFO L93 Difference]: Finished difference Result 403 states and 1227 transitions. [2021-07-13 19:53:43,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-13 19:53:43,515 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:43,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:43,516 INFO L225 Difference]: With dead ends: 403 [2021-07-13 19:53:43,516 INFO L226 Difference]: Without dead ends: 392 [2021-07-13 19:53:43,516 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 197.3ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:43,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-07-13 19:53:43,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 306. [2021-07-13 19:53:43,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 305 states have (on average 3.1180327868852458) internal successors, (951), 305 states have internal predecessors, (951), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:43,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 951 transitions. [2021-07-13 19:53:43,521 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 951 transitions. Word has length 20 [2021-07-13 19:53:43,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:43,521 INFO L482 AbstractCegarLoop]: Abstraction has 306 states and 951 transitions. [2021-07-13 19:53:43,521 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:43,521 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 951 transitions. [2021-07-13 19:53:43,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:43,522 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:43,522 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:43,736 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,35 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:43,737 INFO L430 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:43,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:43,737 INFO L82 PathProgramCache]: Analyzing trace with hash -76255857, now seen corresponding path program 16 times [2021-07-13 19:53:43,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:43,737 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292885943] [2021-07-13 19:53:43,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:43,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:43,851 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:43,851 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:43,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292885943] [2021-07-13 19:53:43,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292885943] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:43,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845212501] [2021-07-13 19:53:43,851 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:43,877 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:43,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:43,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:43,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:43,934 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:43,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:43,935 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:43,942 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:43,943 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:43,943 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:43,993 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:43,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845212501] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:43,993 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:43,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:43,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535581585] [2021-07-13 19:53:43,994 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:43,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:43,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:43,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:43,994 INFO L87 Difference]: Start difference. First operand 306 states and 951 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:44,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:44,263 INFO L93 Difference]: Finished difference Result 448 states and 1357 transitions. [2021-07-13 19:53:44,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:44,263 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:44,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:44,265 INFO L225 Difference]: With dead ends: 448 [2021-07-13 19:53:44,265 INFO L226 Difference]: Without dead ends: 438 [2021-07-13 19:53:44,265 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 286.9ms TimeCoverageRelationStatistics Valid=78, Invalid=302, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:53:44,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-07-13 19:53:44,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 312. [2021-07-13 19:53:44,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 3.112540192926045) internal successors, (968), 311 states have internal predecessors, (968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:44,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 968 transitions. [2021-07-13 19:53:44,272 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 968 transitions. Word has length 20 [2021-07-13 19:53:44,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:44,272 INFO L482 AbstractCegarLoop]: Abstraction has 312 states and 968 transitions. [2021-07-13 19:53:44,272 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:44,272 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 968 transitions. [2021-07-13 19:53:44,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:44,273 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:44,273 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:44,490 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:44,491 INFO L430 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:44,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:44,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1438435337, now seen corresponding path program 17 times [2021-07-13 19:53:44,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:44,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827342560] [2021-07-13 19:53:44,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:44,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:44,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:44,618 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:44,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827342560] [2021-07-13 19:53:44,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827342560] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:44,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893759835] [2021-07-13 19:53:44,618 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:44,655 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:53:44,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:44,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:44,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:44,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:44,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:44,722 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:44,730 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:44,731 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:44,731 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:44,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:44,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893759835] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:44,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:44,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:44,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535998938] [2021-07-13 19:53:44,790 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:44,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:44,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:44,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:44,791 INFO L87 Difference]: Start difference. First operand 312 states and 968 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:45,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:45,264 INFO L93 Difference]: Finished difference Result 497 states and 1504 transitions. [2021-07-13 19:53:45,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-07-13 19:53:45,264 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:45,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:45,267 INFO L225 Difference]: With dead ends: 497 [2021-07-13 19:53:45,267 INFO L226 Difference]: Without dead ends: 485 [2021-07-13 19:53:45,267 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 365.5ms TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:53:45,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2021-07-13 19:53:45,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 312. [2021-07-13 19:53:45,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 3.112540192926045) internal successors, (968), 311 states have internal predecessors, (968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:45,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 968 transitions. [2021-07-13 19:53:45,274 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 968 transitions. Word has length 20 [2021-07-13 19:53:45,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:45,274 INFO L482 AbstractCegarLoop]: Abstraction has 312 states and 968 transitions. [2021-07-13 19:53:45,274 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:45,274 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 968 transitions. [2021-07-13 19:53:45,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:45,275 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:45,275 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:45,484 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,37 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:45,485 INFO L430 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:45,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:45,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1865369703, now seen corresponding path program 17 times [2021-07-13 19:53:45,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:45,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680992384] [2021-07-13 19:53:45,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:45,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:45,558 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:45,558 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:45,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680992384] [2021-07-13 19:53:45,558 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680992384] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:45,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705230316] [2021-07-13 19:53:45,558 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:45,587 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:53:45,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:45,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:45,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:45,652 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:45,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:45,653 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:45,660 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:45,661 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:45,661 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:45,719 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:45,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705230316] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:45,720 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:45,720 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:45,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644113555] [2021-07-13 19:53:45,720 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:45,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:45,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:45,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:45,721 INFO L87 Difference]: Start difference. First operand 312 states and 968 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:45,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:45,910 INFO L93 Difference]: Finished difference Result 435 states and 1319 transitions. [2021-07-13 19:53:45,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-07-13 19:53:45,910 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:45,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:45,912 INFO L225 Difference]: With dead ends: 435 [2021-07-13 19:53:45,912 INFO L226 Difference]: Without dead ends: 426 [2021-07-13 19:53:45,912 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 191.5ms TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-07-13 19:53:45,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2021-07-13 19:53:45,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 315. [2021-07-13 19:53:45,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 3.1146496815286624) internal successors, (978), 314 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:45,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 978 transitions. [2021-07-13 19:53:45,920 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 978 transitions. Word has length 20 [2021-07-13 19:53:45,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:45,920 INFO L482 AbstractCegarLoop]: Abstraction has 315 states and 978 transitions. [2021-07-13 19:53:45,920 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:45,920 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 978 transitions. [2021-07-13 19:53:45,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:45,921 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:45,921 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:46,125 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable73 [2021-07-13 19:53:46,126 INFO L430 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:46,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:46,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1541783525, now seen corresponding path program 18 times [2021-07-13 19:53:46,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:46,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553159537] [2021-07-13 19:53:46,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:46,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:46,203 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:46,203 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:46,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553159537] [2021-07-13 19:53:46,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553159537] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:46,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386771661] [2021-07-13 19:53:46,203 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:46,230 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:53:46,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:46,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:46,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:46,310 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:46,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-07-13 19:53:46,312 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:46,322 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:46,323 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:46,323 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:13 [2021-07-13 19:53:46,370 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:46,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386771661] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:46,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:46,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:46,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459858125] [2021-07-13 19:53:46,370 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:46,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:46,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:46,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:46,371 INFO L87 Difference]: Start difference. First operand 315 states and 978 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:46,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:46,614 INFO L93 Difference]: Finished difference Result 432 states and 1315 transitions. [2021-07-13 19:53:46,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-07-13 19:53:46,614 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:46,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:46,616 INFO L225 Difference]: With dead ends: 432 [2021-07-13 19:53:46,616 INFO L226 Difference]: Without dead ends: 421 [2021-07-13 19:53:46,616 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 190.6ms TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:46,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-07-13 19:53:46,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 312. [2021-07-13 19:53:46,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 3.112540192926045) internal successors, (968), 311 states have internal predecessors, (968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:46,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 968 transitions. [2021-07-13 19:53:46,620 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 968 transitions. Word has length 20 [2021-07-13 19:53:46,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:46,621 INFO L482 AbstractCegarLoop]: Abstraction has 312 states and 968 transitions. [2021-07-13 19:53:46,621 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:46,621 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 968 transitions. [2021-07-13 19:53:46,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:46,622 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:46,622 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:46,825 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:46,825 INFO L430 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:46,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:46,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1004860857, now seen corresponding path program 18 times [2021-07-13 19:53:46,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:46,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [385355302] [2021-07-13 19:53:46,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:46,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:46,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:46,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:46,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [385355302] [2021-07-13 19:53:46,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [385355302] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:46,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955513816] [2021-07-13 19:53:46,929 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:46,956 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:53:46,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:46,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:53:46,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:47,035 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:47,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2021-07-13 19:53:47,037 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:47,048 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:47,052 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:47,052 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:29 [2021-07-13 19:53:47,118 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:47,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955513816] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:47,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:47,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2021-07-13 19:53:47,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935555117] [2021-07-13 19:53:47,118 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-07-13 19:53:47,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:47,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-07-13 19:53:47,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:47,119 INFO L87 Difference]: Start difference. First operand 312 states and 968 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:48,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:48,100 INFO L93 Difference]: Finished difference Result 644 states and 1918 transitions. [2021-07-13 19:53:48,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:53:48,101 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:48,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:48,102 INFO L225 Difference]: With dead ends: 644 [2021-07-13 19:53:48,102 INFO L226 Difference]: Without dead ends: 622 [2021-07-13 19:53:48,102 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 720.0ms TimeCoverageRelationStatistics Valid=160, Invalid=832, Unknown=0, NotChecked=0, Total=992 [2021-07-13 19:53:48,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2021-07-13 19:53:48,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 316. [2021-07-13 19:53:48,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 315 states have (on average 3.111111111111111) internal successors, (980), 315 states have internal predecessors, (980), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:48,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 980 transitions. [2021-07-13 19:53:48,108 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 980 transitions. Word has length 20 [2021-07-13 19:53:48,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:48,108 INFO L482 AbstractCegarLoop]: Abstraction has 316 states and 980 transitions. [2021-07-13 19:53:48,108 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:48,108 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 980 transitions. [2021-07-13 19:53:48,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:48,109 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:48,109 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:48,309 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:48,309 INFO L430 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:48,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:48,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1209778991, now seen corresponding path program 19 times [2021-07-13 19:53:48,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:48,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974817426] [2021-07-13 19:53:48,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:48,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:48,399 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:48,399 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:48,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974817426] [2021-07-13 19:53:48,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974817426] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:48,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984169585] [2021-07-13 19:53:48,399 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:48,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:48,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:48,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:48,530 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:48,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-07-13 19:53:48,532 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:48,540 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:48,541 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:48,541 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-07-13 19:53:48,583 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:48,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984169585] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:48,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:48,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-07-13 19:53:48,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021964741] [2021-07-13 19:53:48,584 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-07-13 19:53:48,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:48,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-07-13 19:53:48,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:48,584 INFO L87 Difference]: Start difference. First operand 316 states and 980 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:48,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:48,828 INFO L93 Difference]: Finished difference Result 437 states and 1326 transitions. [2021-07-13 19:53:48,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-13 19:53:48,829 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:48,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:48,830 INFO L225 Difference]: With dead ends: 437 [2021-07-13 19:53:48,830 INFO L226 Difference]: Without dead ends: 426 [2021-07-13 19:53:48,830 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 216.6ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:48,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2021-07-13 19:53:48,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 315. [2021-07-13 19:53:48,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 3.1178343949044587) internal successors, (979), 314 states have internal predecessors, (979), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:48,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 979 transitions. [2021-07-13 19:53:48,834 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 979 transitions. Word has length 20 [2021-07-13 19:53:48,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:48,835 INFO L482 AbstractCegarLoop]: Abstraction has 315 states and 979 transitions. [2021-07-13 19:53:48,835 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:48,835 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 979 transitions. [2021-07-13 19:53:48,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:48,835 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:48,835 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:49,038 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:49,038 INFO L430 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:49,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:49,039 INFO L82 PathProgramCache]: Analyzing trace with hash -1625404767, now seen corresponding path program 19 times [2021-07-13 19:53:49,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:49,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817421857] [2021-07-13 19:53:49,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:49,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:49,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:49,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:49,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817421857] [2021-07-13 19:53:49,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817421857] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:49,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075411780] [2021-07-13 19:53:49,141 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:49,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:49,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-13 19:53:49,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:49,262 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:53:49,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 10 [2021-07-13 19:53:49,264 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:53:49,271 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:49,272 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:49,272 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-07-13 19:53:49,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:49,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075411780] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:49,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:49,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2021-07-13 19:53:49,318 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149814362] [2021-07-13 19:53:49,318 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:49,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:49,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:49,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:49,318 INFO L87 Difference]: Start difference. First operand 315 states and 979 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:49,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:49,810 INFO L93 Difference]: Finished difference Result 577 states and 1769 transitions. [2021-07-13 19:53:49,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-13 19:53:49,810 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:49,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:49,811 INFO L225 Difference]: With dead ends: 577 [2021-07-13 19:53:49,811 INFO L226 Difference]: Without dead ends: 566 [2021-07-13 19:53:49,811 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 330.7ms TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:53:49,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 566 states. [2021-07-13 19:53:49,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 566 to 323. [2021-07-13 19:53:49,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 3.1180124223602483) internal successors, (1004), 322 states have internal predecessors, (1004), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:49,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 1004 transitions. [2021-07-13 19:53:49,817 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 1004 transitions. Word has length 20 [2021-07-13 19:53:49,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:49,817 INFO L482 AbstractCegarLoop]: Abstraction has 323 states and 1004 transitions. [2021-07-13 19:53:49,817 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:49,817 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 1004 transitions. [2021-07-13 19:53:49,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-07-13 19:53:49,818 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:49,818 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:50,023 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-07-13 19:53:50,023 INFO L430 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:50,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:50,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1821665449, now seen corresponding path program 20 times [2021-07-13 19:53:50,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:50,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783058990] [2021-07-13 19:53:50,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:50,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:50,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:50,103 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:50,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783058990] [2021-07-13 19:53:50,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783058990] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:50,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003312305] [2021-07-13 19:53:50,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:50,136 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:50,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:50,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 22 conjunts are in the unsatisfiable core [2021-07-13 19:53:50,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:50,208 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:50,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2021-07-13 19:53:50,214 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:53:50,223 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:53:50,224 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:53:50,224 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:22 [2021-07-13 19:53:50,291 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:50,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003312305] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:50,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:50,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 13 [2021-07-13 19:53:50,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174274232] [2021-07-13 19:53:50,292 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:53:50,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:50,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:53:50,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:53:50,293 INFO L87 Difference]: Start difference. First operand 323 states and 1004 transitions. Second operand has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 13 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:50,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:50,803 INFO L93 Difference]: Finished difference Result 516 states and 1586 transitions. [2021-07-13 19:53:50,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:50,804 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 13 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-07-13 19:53:50,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:50,805 INFO L225 Difference]: With dead ends: 516 [2021-07-13 19:53:50,805 INFO L226 Difference]: Without dead ends: 505 [2021-07-13 19:53:50,805 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 350.7ms TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:53:50,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-07-13 19:53:50,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 322. [2021-07-13 19:53:50,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 321 states have (on average 3.1246105919003115) internal successors, (1003), 321 states have internal predecessors, (1003), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:50,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 1003 transitions. [2021-07-13 19:53:50,810 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 1003 transitions. Word has length 20 [2021-07-13 19:53:50,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:50,810 INFO L482 AbstractCegarLoop]: Abstraction has 322 states and 1003 transitions. [2021-07-13 19:53:50,810 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 13 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:50,810 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 1003 transitions. [2021-07-13 19:53:50,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:50,811 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:50,811 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:51,011 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:51,011 INFO L430 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:51,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:51,012 INFO L82 PathProgramCache]: Analyzing trace with hash -827696633, now seen corresponding path program 20 times [2021-07-13 19:53:51,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:51,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829761816] [2021-07-13 19:53:51,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:51,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:51,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:51,037 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:51,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829761816] [2021-07-13 19:53:51,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829761816] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:51,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56154560] [2021-07-13 19:53:51,038 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:51,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:51,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:51,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:51,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:51,123 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:51,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56154560] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:51,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:51,123 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-07-13 19:53:51,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977098103] [2021-07-13 19:53:51,124 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-13 19:53:51,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:51,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-13 19:53:51,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:53:51,125 INFO L87 Difference]: Start difference. First operand 322 states and 1003 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:51,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:51,190 INFO L93 Difference]: Finished difference Result 489 states and 1527 transitions. [2021-07-13 19:53:51,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-07-13 19:53:51,191 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:51,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:51,192 INFO L225 Difference]: With dead ends: 489 [2021-07-13 19:53:51,192 INFO L226 Difference]: Without dead ends: 489 [2021-07-13 19:53:51,192 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 50.3ms TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:53:51,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-07-13 19:53:51,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 311. [2021-07-13 19:53:51,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 3.203225806451613) internal successors, (993), 310 states have internal predecessors, (993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:51,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 993 transitions. [2021-07-13 19:53:51,196 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 993 transitions. Word has length 22 [2021-07-13 19:53:51,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:51,197 INFO L482 AbstractCegarLoop]: Abstraction has 311 states and 993 transitions. [2021-07-13 19:53:51,197 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:51,197 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 993 transitions. [2021-07-13 19:53:51,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:51,197 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:51,197 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:51,398 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:51,398 INFO L430 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:51,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:51,398 INFO L82 PathProgramCache]: Analyzing trace with hash 196643718, now seen corresponding path program 21 times [2021-07-13 19:53:51,398 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:51,398 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016516841] [2021-07-13 19:53:51,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:51,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:51,427 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:51,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:51,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016516841] [2021-07-13 19:53:51,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016516841] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:51,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484693658] [2021-07-13 19:53:51,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:51,477 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:53:51,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:51,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:51,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:51,519 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:51,520 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484693658] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:51,520 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:51,520 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-07-13 19:53:51,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891336437] [2021-07-13 19:53:51,520 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-13 19:53:51,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:51,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-13 19:53:51,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:53:51,521 INFO L87 Difference]: Start difference. First operand 311 states and 993 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:51,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:51,608 INFO L93 Difference]: Finished difference Result 498 states and 1529 transitions. [2021-07-13 19:53:51,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-13 19:53:51,608 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:51,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:51,609 INFO L225 Difference]: With dead ends: 498 [2021-07-13 19:53:51,610 INFO L226 Difference]: Without dead ends: 439 [2021-07-13 19:53:51,610 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 67.6ms TimeCoverageRelationStatistics Valid=66, Invalid=144, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:51,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2021-07-13 19:53:51,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 311. [2021-07-13 19:53:51,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 3.170967741935484) internal successors, (983), 310 states have internal predecessors, (983), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:51,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 983 transitions. [2021-07-13 19:53:51,614 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 983 transitions. Word has length 22 [2021-07-13 19:53:51,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:51,614 INFO L482 AbstractCegarLoop]: Abstraction has 311 states and 983 transitions. [2021-07-13 19:53:51,615 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:51,615 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 983 transitions. [2021-07-13 19:53:51,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:51,615 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:51,615 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:51,819 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2021-07-13 19:53:51,820 INFO L430 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:51,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:51,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1724048449, now seen corresponding path program 22 times [2021-07-13 19:53:51,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:51,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095076373] [2021-07-13 19:53:51,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:51,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:51,844 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:51,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:51,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095076373] [2021-07-13 19:53:51,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095076373] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:51,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106302444] [2021-07-13 19:53:51,845 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:51,872 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:51,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:51,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:51,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:51,949 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:51,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106302444] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:51,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:51,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:53:51,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314746914] [2021-07-13 19:53:51,950 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:51,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:51,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:51,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:51,950 INFO L87 Difference]: Start difference. First operand 311 states and 983 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:52,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:52,096 INFO L93 Difference]: Finished difference Result 640 states and 1919 transitions. [2021-07-13 19:53:52,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-13 19:53:52,096 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:52,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:52,098 INFO L225 Difference]: With dead ends: 640 [2021-07-13 19:53:52,098 INFO L226 Difference]: Without dead ends: 640 [2021-07-13 19:53:52,098 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 87.6ms TimeCoverageRelationStatistics Valid=82, Invalid=158, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:52,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2021-07-13 19:53:52,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 368. [2021-07-13 19:53:52,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 368 states, 367 states have (on average 3.231607629427793) internal successors, (1186), 367 states have internal predecessors, (1186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:52,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 1186 transitions. [2021-07-13 19:53:52,104 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 1186 transitions. Word has length 22 [2021-07-13 19:53:52,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:52,104 INFO L482 AbstractCegarLoop]: Abstraction has 368 states and 1186 transitions. [2021-07-13 19:53:52,104 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:52,104 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 1186 transitions. [2021-07-13 19:53:52,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:52,105 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:52,105 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:52,316 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:52,316 INFO L430 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:52,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:52,316 INFO L82 PathProgramCache]: Analyzing trace with hash 40343294, now seen corresponding path program 23 times [2021-07-13 19:53:52,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:52,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390927767] [2021-07-13 19:53:52,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:52,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:52,341 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:52,341 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:52,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390927767] [2021-07-13 19:53:52,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390927767] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:52,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262483864] [2021-07-13 19:53:52,342 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:52,389 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:53:52,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:52,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:52,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:52,449 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:52,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262483864] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:52,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:52,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:53:52,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208246127] [2021-07-13 19:53:52,449 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:52,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:52,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:52,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:52,450 INFO L87 Difference]: Start difference. First operand 368 states and 1186 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:52,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:52,637 INFO L93 Difference]: Finished difference Result 772 states and 2287 transitions. [2021-07-13 19:53:52,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-07-13 19:53:52,638 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:52,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:52,639 INFO L225 Difference]: With dead ends: 772 [2021-07-13 19:53:52,640 INFO L226 Difference]: Without dead ends: 728 [2021-07-13 19:53:52,640 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 123.3ms TimeCoverageRelationStatistics Valid=115, Invalid=265, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:53:52,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 728 states. [2021-07-13 19:53:52,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 728 to 506. [2021-07-13 19:53:52,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 505 states have (on average 3.235643564356436) internal successors, (1634), 505 states have internal predecessors, (1634), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:52,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 1634 transitions. [2021-07-13 19:53:52,648 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 1634 transitions. Word has length 22 [2021-07-13 19:53:52,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:52,648 INFO L482 AbstractCegarLoop]: Abstraction has 506 states and 1634 transitions. [2021-07-13 19:53:52,648 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:52,648 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 1634 transitions. [2021-07-13 19:53:52,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:52,649 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:52,649 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:52,849 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2021-07-13 19:53:52,850 INFO L430 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:52,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:52,850 INFO L82 PathProgramCache]: Analyzing trace with hash 358278619, now seen corresponding path program 24 times [2021-07-13 19:53:52,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:52,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106870968] [2021-07-13 19:53:52,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:52,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:52,878 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:52,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:52,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106870968] [2021-07-13 19:53:52,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106870968] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:52,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373504157] [2021-07-13 19:53:52,879 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:52,907 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:53:52,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:52,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:52,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:52,958 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:52,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373504157] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:52,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:52,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:53:52,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905384771] [2021-07-13 19:53:52,958 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:52,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:52,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:52,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:52,959 INFO L87 Difference]: Start difference. First operand 506 states and 1634 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:53,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:53,078 INFO L93 Difference]: Finished difference Result 972 states and 2907 transitions. [2021-07-13 19:53:53,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:53,078 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:53,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:53,080 INFO L225 Difference]: With dead ends: 972 [2021-07-13 19:53:53,080 INFO L226 Difference]: Without dead ends: 972 [2021-07-13 19:53:53,080 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 81.7ms TimeCoverageRelationStatistics Valid=89, Invalid=151, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:53,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 972 states. [2021-07-13 19:53:53,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 972 to 557. [2021-07-13 19:53:53,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 557 states, 556 states have (on average 3.318345323741007) internal successors, (1845), 556 states have internal predecessors, (1845), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:53,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 557 states to 557 states and 1845 transitions. [2021-07-13 19:53:53,089 INFO L78 Accepts]: Start accepts. Automaton has 557 states and 1845 transitions. Word has length 22 [2021-07-13 19:53:53,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:53,089 INFO L482 AbstractCegarLoop]: Abstraction has 557 states and 1845 transitions. [2021-07-13 19:53:53,089 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:53,089 INFO L276 IsEmpty]: Start isEmpty. Operand 557 states and 1845 transitions. [2021-07-13 19:53:53,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:53,090 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:53,090 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:53,290 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:53,291 INFO L430 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:53,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:53,291 INFO L82 PathProgramCache]: Analyzing trace with hash -527046306, now seen corresponding path program 25 times [2021-07-13 19:53:53,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:53,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958291674] [2021-07-13 19:53:53,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:53,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:53,315 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:53,315 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:53,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958291674] [2021-07-13 19:53:53,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958291674] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:53,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627060284] [2021-07-13 19:53:53,316 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:53,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:53,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:53,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:53,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:53,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627060284] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:53,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:53,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:53:53,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510780072] [2021-07-13 19:53:53,413 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:53,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:53,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:53,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:53,414 INFO L87 Difference]: Start difference. First operand 557 states and 1845 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:53,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:53,584 INFO L93 Difference]: Finished difference Result 964 states and 2972 transitions. [2021-07-13 19:53:53,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-07-13 19:53:53,584 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:53,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:53,586 INFO L225 Difference]: With dead ends: 964 [2021-07-13 19:53:53,586 INFO L226 Difference]: Without dead ends: 916 [2021-07-13 19:53:53,586 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 111.6ms TimeCoverageRelationStatistics Valid=114, Invalid=266, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:53:53,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 916 states. [2021-07-13 19:53:53,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 916 to 606. [2021-07-13 19:53:53,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 606 states, 605 states have (on average 3.3338842975206613) internal successors, (2017), 605 states have internal predecessors, (2017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:53,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 606 states to 606 states and 2017 transitions. [2021-07-13 19:53:53,598 INFO L78 Accepts]: Start accepts. Automaton has 606 states and 2017 transitions. Word has length 22 [2021-07-13 19:53:53,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:53,598 INFO L482 AbstractCegarLoop]: Abstraction has 606 states and 2017 transitions. [2021-07-13 19:53:53,598 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:53,599 INFO L276 IsEmpty]: Start isEmpty. Operand 606 states and 2017 transitions. [2021-07-13 19:53:53,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:53,600 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:53,600 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:53,812 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87 [2021-07-13 19:53:53,813 INFO L430 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:53,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:53,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1135425701, now seen corresponding path program 26 times [2021-07-13 19:53:53,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:53,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251176083] [2021-07-13 19:53:53,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:53,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:53,838 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:53,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:53,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251176083] [2021-07-13 19:53:53,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251176083] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:53,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553234728] [2021-07-13 19:53:53,838 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:53,871 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:53,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:53,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:53,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:53,924 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:53,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553234728] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:53,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:53,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:53:53,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582191762] [2021-07-13 19:53:53,925 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:53,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:53,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:53,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:53,925 INFO L87 Difference]: Start difference. First operand 606 states and 2017 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:54,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:54,104 INFO L93 Difference]: Finished difference Result 881 states and 2727 transitions. [2021-07-13 19:53:54,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-13 19:53:54,104 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:54,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:54,107 INFO L225 Difference]: With dead ends: 881 [2021-07-13 19:53:54,107 INFO L226 Difference]: Without dead ends: 871 [2021-07-13 19:53:54,107 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 119.4ms TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:53:54,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2021-07-13 19:53:54,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 612. [2021-07-13 19:53:54,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 611 states have (on average 3.3060556464811786) internal successors, (2020), 611 states have internal predecessors, (2020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:54,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 2020 transitions. [2021-07-13 19:53:54,118 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 2020 transitions. Word has length 22 [2021-07-13 19:53:54,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:54,119 INFO L482 AbstractCegarLoop]: Abstraction has 612 states and 2020 transitions. [2021-07-13 19:53:54,119 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:54,119 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 2020 transitions. [2021-07-13 19:53:54,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:54,120 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:54,120 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:54,333 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2021-07-13 19:53:54,333 INFO L430 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:54,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:54,334 INFO L82 PathProgramCache]: Analyzing trace with hash -1507852130, now seen corresponding path program 27 times [2021-07-13 19:53:54,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:54,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179555839] [2021-07-13 19:53:54,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:54,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:54,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:54,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:54,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179555839] [2021-07-13 19:53:54,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179555839] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:54,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358489965] [2021-07-13 19:53:54,358 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:54,392 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:53:54,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:54,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:54,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:54,445 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:54,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358489965] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:54,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:54,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:53:54,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167930086] [2021-07-13 19:53:54,446 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:54,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:54,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:54,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:54,448 INFO L87 Difference]: Start difference. First operand 612 states and 2020 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:54,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:54,607 INFO L93 Difference]: Finished difference Result 917 states and 2822 transitions. [2021-07-13 19:53:54,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-07-13 19:53:54,607 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:54,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:54,609 INFO L225 Difference]: With dead ends: 917 [2021-07-13 19:53:54,610 INFO L226 Difference]: Without dead ends: 893 [2021-07-13 19:53:54,610 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 89.5ms TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:53:54,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 893 states. [2021-07-13 19:53:54,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 893 to 606. [2021-07-13 19:53:54,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 606 states, 605 states have (on average 3.3239669421487603) internal successors, (2011), 605 states have internal predecessors, (2011), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:54,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 606 states to 606 states and 2011 transitions. [2021-07-13 19:53:54,622 INFO L78 Accepts]: Start accepts. Automaton has 606 states and 2011 transitions. Word has length 22 [2021-07-13 19:53:54,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:54,623 INFO L482 AbstractCegarLoop]: Abstraction has 606 states and 2011 transitions. [2021-07-13 19:53:54,623 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:54,623 INFO L276 IsEmpty]: Start isEmpty. Operand 606 states and 2011 transitions. [2021-07-13 19:53:54,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:54,624 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:54,624 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:54,848 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:54,848 INFO L430 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:54,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:54,848 INFO L82 PathProgramCache]: Analyzing trace with hash 326583295, now seen corresponding path program 28 times [2021-07-13 19:53:54,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:54,848 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807218964] [2021-07-13 19:53:54,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:54,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:54,875 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:54,875 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:54,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807218964] [2021-07-13 19:53:54,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807218964] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:54,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207322604] [2021-07-13 19:53:54,876 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:54,915 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:54,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:54,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:54,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:54,983 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:54,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207322604] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:54,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:54,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2021-07-13 19:53:54,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111666904] [2021-07-13 19:53:54,984 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-07-13 19:53:54,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:54,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-07-13 19:53:54,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:53:54,984 INFO L87 Difference]: Start difference. First operand 606 states and 2011 transitions. Second operand has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:55,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:55,181 INFO L93 Difference]: Finished difference Result 1221 states and 3751 transitions. [2021-07-13 19:53:55,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-07-13 19:53:55,182 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:55,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:55,185 INFO L225 Difference]: With dead ends: 1221 [2021-07-13 19:53:55,186 INFO L226 Difference]: Without dead ends: 1221 [2021-07-13 19:53:55,186 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 127.1ms TimeCoverageRelationStatistics Valid=124, Invalid=256, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:53:55,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1221 states. [2021-07-13 19:53:55,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1221 to 650. [2021-07-13 19:53:55,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 650 states, 649 states have (on average 3.362095531587057) internal successors, (2182), 649 states have internal predecessors, (2182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:55,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 650 states to 650 states and 2182 transitions. [2021-07-13 19:53:55,200 INFO L78 Accepts]: Start accepts. Automaton has 650 states and 2182 transitions. Word has length 22 [2021-07-13 19:53:55,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:55,200 INFO L482 AbstractCegarLoop]: Abstraction has 650 states and 2182 transitions. [2021-07-13 19:53:55,200 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:55,200 INFO L276 IsEmpty]: Start isEmpty. Operand 650 states and 2182 transitions. [2021-07-13 19:53:55,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:55,201 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:55,201 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:55,402 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,52 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:55,402 INFO L430 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:55,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:55,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1657114921, now seen corresponding path program 29 times [2021-07-13 19:53:55,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:55,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735454026] [2021-07-13 19:53:55,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:55,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:55,421 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:55,421 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:55,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735454026] [2021-07-13 19:53:55,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [735454026] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:55,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734052797] [2021-07-13 19:53:55,421 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:55,448 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-07-13 19:53:55,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:55,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:55,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:55,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:55,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734052797] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:55,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:55,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-07-13 19:53:55,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594755398] [2021-07-13 19:53:55,506 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:55,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:55,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:55,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:55,507 INFO L87 Difference]: Start difference. First operand 650 states and 2182 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:55,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:55,632 INFO L93 Difference]: Finished difference Result 1386 states and 4279 transitions. [2021-07-13 19:53:55,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:55,632 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:55,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:55,635 INFO L225 Difference]: With dead ends: 1386 [2021-07-13 19:53:55,635 INFO L226 Difference]: Without dead ends: 1386 [2021-07-13 19:53:55,635 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 81.6ms TimeCoverageRelationStatistics Valid=91, Invalid=149, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:55,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1386 states. [2021-07-13 19:53:55,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1386 to 762. [2021-07-13 19:53:55,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 762 states, 761 states have (on average 3.4480946123521683) internal successors, (2624), 761 states have internal predecessors, (2624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:55,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 762 states to 762 states and 2624 transitions. [2021-07-13 19:53:55,654 INFO L78 Accepts]: Start accepts. Automaton has 762 states and 2624 transitions. Word has length 22 [2021-07-13 19:53:55,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:55,654 INFO L482 AbstractCegarLoop]: Abstraction has 762 states and 2624 transitions. [2021-07-13 19:53:55,654 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:55,654 INFO L276 IsEmpty]: Start isEmpty. Operand 762 states and 2624 transitions. [2021-07-13 19:53:55,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:55,656 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:55,656 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:55,875 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:55,875 INFO L430 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:55,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:55,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1144148055, now seen corresponding path program 30 times [2021-07-13 19:53:55,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:55,876 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085423754] [2021-07-13 19:53:55,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:55,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:55,896 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-07-13 19:53:55,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:55,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085423754] [2021-07-13 19:53:55,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085423754] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:55,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288598453] [2021-07-13 19:53:55,896 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:55,930 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:53:55,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:55,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:55,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:55,992 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:55,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288598453] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:55,992 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:55,992 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-07-13 19:53:55,992 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517638065] [2021-07-13 19:53:55,992 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:55,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:55,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:55,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:55,993 INFO L87 Difference]: Start difference. First operand 762 states and 2624 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 10 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:56,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:56,202 INFO L93 Difference]: Finished difference Result 1253 states and 3889 transitions. [2021-07-13 19:53:56,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-07-13 19:53:56,202 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 10 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:56,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:56,207 INFO L225 Difference]: With dead ends: 1253 [2021-07-13 19:53:56,207 INFO L226 Difference]: Without dead ends: 1244 [2021-07-13 19:53:56,208 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 151.3ms TimeCoverageRelationStatistics Valid=165, Invalid=297, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:53:56,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1244 states. [2021-07-13 19:53:56,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1244 to 762. [2021-07-13 19:53:56,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 762 states, 761 states have (on average 3.4191852825229962) internal successors, (2602), 761 states have internal predecessors, (2602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:56,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 762 states to 762 states and 2602 transitions. [2021-07-13 19:53:56,226 INFO L78 Accepts]: Start accepts. Automaton has 762 states and 2602 transitions. Word has length 22 [2021-07-13 19:53:56,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:56,226 INFO L482 AbstractCegarLoop]: Abstraction has 762 states and 2602 transitions. [2021-07-13 19:53:56,226 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 10 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:56,227 INFO L276 IsEmpty]: Start isEmpty. Operand 762 states and 2602 transitions. [2021-07-13 19:53:56,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:56,228 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:56,228 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:56,444 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,54 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:56,445 INFO L430 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:56,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:56,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1294632791, now seen corresponding path program 31 times [2021-07-13 19:53:56,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:56,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964411793] [2021-07-13 19:53:56,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:56,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:56,466 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:56,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:56,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964411793] [2021-07-13 19:53:56,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964411793] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:56,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291319386] [2021-07-13 19:53:56,467 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:56,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:56,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:56,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:56,551 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:56,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291319386] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:56,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:56,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2021-07-13 19:53:56,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124529528] [2021-07-13 19:53:56,551 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-07-13 19:53:56,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:56,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-07-13 19:53:56,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:53:56,552 INFO L87 Difference]: Start difference. First operand 762 states and 2602 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:56,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:56,735 INFO L93 Difference]: Finished difference Result 1263 states and 4021 transitions. [2021-07-13 19:53:56,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-13 19:53:56,736 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:56,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:56,739 INFO L225 Difference]: With dead ends: 1263 [2021-07-13 19:53:56,739 INFO L226 Difference]: Without dead ends: 1251 [2021-07-13 19:53:56,739 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 136.1ms TimeCoverageRelationStatistics Valid=162, Invalid=344, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:53:56,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1251 states. [2021-07-13 19:53:56,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1251 to 847. [2021-07-13 19:53:56,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 847 states, 846 states have (on average 3.4539007092198584) internal successors, (2922), 846 states have internal predecessors, (2922), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:56,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 847 states to 847 states and 2922 transitions. [2021-07-13 19:53:56,759 INFO L78 Accepts]: Start accepts. Automaton has 847 states and 2922 transitions. Word has length 22 [2021-07-13 19:53:56,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:56,759 INFO L482 AbstractCegarLoop]: Abstraction has 847 states and 2922 transitions. [2021-07-13 19:53:56,760 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:56,760 INFO L276 IsEmpty]: Start isEmpty. Operand 847 states and 2922 transitions. [2021-07-13 19:53:56,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:56,761 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:56,761 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:56,983 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,55 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:56,984 INFO L430 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:56,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:56,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1456964799, now seen corresponding path program 32 times [2021-07-13 19:53:56,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:56,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528044428] [2021-07-13 19:53:56,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:56,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:57,009 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:57,010 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:57,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528044428] [2021-07-13 19:53:57,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528044428] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:57,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246243131] [2021-07-13 19:53:57,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:57,048 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:53:57,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:57,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:57,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:57,114 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:57,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246243131] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:57,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:57,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2021-07-13 19:53:57,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432184301] [2021-07-13 19:53:57,115 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-07-13 19:53:57,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:57,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-07-13 19:53:57,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:53:57,115 INFO L87 Difference]: Start difference. First operand 847 states and 2922 transitions. Second operand has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 11 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:57,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:57,265 INFO L93 Difference]: Finished difference Result 1246 states and 3991 transitions. [2021-07-13 19:53:57,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-07-13 19:53:57,279 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 11 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:57,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:57,282 INFO L225 Difference]: With dead ends: 1246 [2021-07-13 19:53:57,282 INFO L226 Difference]: Without dead ends: 1246 [2021-07-13 19:53:57,282 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 100.4ms TimeCoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2021-07-13 19:53:57,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1246 states. [2021-07-13 19:53:57,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1246 to 888. [2021-07-13 19:53:57,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 888 states, 887 states have (on average 3.47576099210823) internal successors, (3083), 887 states have internal predecessors, (3083), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:57,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 3083 transitions. [2021-07-13 19:53:57,298 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 3083 transitions. Word has length 22 [2021-07-13 19:53:57,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:57,298 INFO L482 AbstractCegarLoop]: Abstraction has 888 states and 3083 transitions. [2021-07-13 19:53:57,298 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 11 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:57,299 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 3083 transitions. [2021-07-13 19:53:57,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:57,300 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:57,300 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:57,500 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:57,501 INFO L430 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:57,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:57,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1570199292, now seen corresponding path program 33 times [2021-07-13 19:53:57,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:57,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893364140] [2021-07-13 19:53:57,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:57,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:57,526 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:57,526 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:57,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893364140] [2021-07-13 19:53:57,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893364140] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:57,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754621030] [2021-07-13 19:53:57,527 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:57,574 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:53:57,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:57,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:57,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:57,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:57,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754621030] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:57,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:57,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2021-07-13 19:53:57,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186312053] [2021-07-13 19:53:57,636 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-07-13 19:53:57,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:57,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-07-13 19:53:57,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:53:57,636 INFO L87 Difference]: Start difference. First operand 888 states and 3083 transitions. Second operand has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:57,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:57,848 INFO L93 Difference]: Finished difference Result 1362 states and 4328 transitions. [2021-07-13 19:53:57,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-07-13 19:53:57,848 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:57,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:57,866 INFO L225 Difference]: With dead ends: 1362 [2021-07-13 19:53:57,866 INFO L226 Difference]: Without dead ends: 1275 [2021-07-13 19:53:57,866 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 151.9ms TimeCoverageRelationStatistics Valid=198, Invalid=402, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:53:57,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1275 states. [2021-07-13 19:53:57,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1275 to 976. [2021-07-13 19:53:57,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 976 states, 975 states have (on average 3.4574358974358974) internal successors, (3371), 975 states have internal predecessors, (3371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:57,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 976 states to 976 states and 3371 transitions. [2021-07-13 19:53:57,889 INFO L78 Accepts]: Start accepts. Automaton has 976 states and 3371 transitions. Word has length 22 [2021-07-13 19:53:57,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:57,889 INFO L482 AbstractCegarLoop]: Abstraction has 976 states and 3371 transitions. [2021-07-13 19:53:57,889 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:57,889 INFO L276 IsEmpty]: Start isEmpty. Operand 976 states and 3371 transitions. [2021-07-13 19:53:57,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:57,891 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:57,891 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:58,113 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:58,113 INFO L430 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:58,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:58,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1138465271, now seen corresponding path program 34 times [2021-07-13 19:53:58,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:58,113 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022507340] [2021-07-13 19:53:58,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:58,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:58,134 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:58,134 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:58,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022507340] [2021-07-13 19:53:58,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022507340] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:58,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377378340] [2021-07-13 19:53:58,134 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:58,162 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:53:58,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:58,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:58,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:58,217 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:58,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377378340] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:58,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:58,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-07-13 19:53:58,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082192875] [2021-07-13 19:53:58,218 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:58,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:58,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:58,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:58,218 INFO L87 Difference]: Start difference. First operand 976 states and 3371 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:58,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:58,371 INFO L93 Difference]: Finished difference Result 1340 states and 4319 transitions. [2021-07-13 19:53:58,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-13 19:53:58,372 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:58,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:58,374 INFO L225 Difference]: With dead ends: 1340 [2021-07-13 19:53:58,374 INFO L226 Difference]: Without dead ends: 1331 [2021-07-13 19:53:58,374 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 90.2ms TimeCoverageRelationStatistics Valid=86, Invalid=220, Unknown=0, NotChecked=0, Total=306 [2021-07-13 19:53:58,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1331 states. [2021-07-13 19:53:58,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1331 to 928. [2021-07-13 19:53:58,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 928 states, 927 states have (on average 3.4217907227615965) internal successors, (3172), 927 states have internal predecessors, (3172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:58,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 928 states to 928 states and 3172 transitions. [2021-07-13 19:53:58,387 INFO L78 Accepts]: Start accepts. Automaton has 928 states and 3172 transitions. Word has length 22 [2021-07-13 19:53:58,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:58,387 INFO L482 AbstractCegarLoop]: Abstraction has 928 states and 3172 transitions. [2021-07-13 19:53:58,387 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:58,387 INFO L276 IsEmpty]: Start isEmpty. Operand 928 states and 3172 transitions. [2021-07-13 19:53:58,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:58,389 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:58,389 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:58,589 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:58,589 INFO L430 AbstractCegarLoop]: === Iteration 70 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:58,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:58,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1510891700, now seen corresponding path program 35 times [2021-07-13 19:53:58,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:58,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896924670] [2021-07-13 19:53:58,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:58,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:58,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:58,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:58,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896924670] [2021-07-13 19:53:58,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896924670] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:58,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839029114] [2021-07-13 19:53:58,609 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:58,638 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:53:58,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:58,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:58,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:58,693 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:58,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839029114] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:58,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:58,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-07-13 19:53:58,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563754475] [2021-07-13 19:53:58,694 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:58,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:58,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:58,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:58,694 INFO L87 Difference]: Start difference. First operand 928 states and 3172 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:58,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:58,819 INFO L93 Difference]: Finished difference Result 1477 states and 4669 transitions. [2021-07-13 19:53:58,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:58,819 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:58,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:58,822 INFO L225 Difference]: With dead ends: 1477 [2021-07-13 19:53:58,822 INFO L226 Difference]: Without dead ends: 1435 [2021-07-13 19:53:58,822 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 82.7ms TimeCoverageRelationStatistics Valid=91, Invalid=149, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:53:58,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1435 states. [2021-07-13 19:53:58,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1435 to 1075. [2021-07-13 19:53:58,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1075 states, 1074 states have (on average 3.4320297951582868) internal successors, (3686), 1074 states have internal predecessors, (3686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:58,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1075 states to 1075 states and 3686 transitions. [2021-07-13 19:53:58,840 INFO L78 Accepts]: Start accepts. Automaton has 1075 states and 3686 transitions. Word has length 22 [2021-07-13 19:53:58,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:58,840 INFO L482 AbstractCegarLoop]: Abstraction has 1075 states and 3686 transitions. [2021-07-13 19:53:58,840 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:58,840 INFO L276 IsEmpty]: Start isEmpty. Operand 1075 states and 3686 transitions. [2021-07-13 19:53:58,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:58,842 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:58,842 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:59,043 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2021-07-13 19:53:59,043 INFO L430 AbstractCegarLoop]: === Iteration 71 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:59,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:59,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1381268681, now seen corresponding path program 36 times [2021-07-13 19:53:59,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:59,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830604827] [2021-07-13 19:53:59,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:59,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:59,080 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:59,080 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:59,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830604827] [2021-07-13 19:53:59,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830604827] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:59,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519205530] [2021-07-13 19:53:59,080 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:59,129 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-07-13 19:53:59,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:53:59,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:59,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:59,194 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:59,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519205530] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:59,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:59,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-07-13 19:53:59,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630663668] [2021-07-13 19:53:59,195 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:59,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:59,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:59,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:59,196 INFO L87 Difference]: Start difference. First operand 1075 states and 3686 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:59,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:59,349 INFO L93 Difference]: Finished difference Result 1825 states and 5875 transitions. [2021-07-13 19:53:59,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:53:59,350 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:59,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:59,353 INFO L225 Difference]: With dead ends: 1825 [2021-07-13 19:53:59,353 INFO L226 Difference]: Without dead ends: 1825 [2021-07-13 19:53:59,354 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 78.9ms TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2021-07-13 19:53:59,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1825 states. [2021-07-13 19:53:59,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1825 to 1237. [2021-07-13 19:53:59,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1237 states, 1236 states have (on average 3.5032362459546924) internal successors, (4330), 1236 states have internal predecessors, (4330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:59,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1237 states to 1237 states and 4330 transitions. [2021-07-13 19:53:59,382 INFO L78 Accepts]: Start accepts. Automaton has 1237 states and 4330 transitions. Word has length 22 [2021-07-13 19:53:59,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:59,382 INFO L482 AbstractCegarLoop]: Abstraction has 1237 states and 4330 transitions. [2021-07-13 19:53:59,382 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:59,382 INFO L276 IsEmpty]: Start isEmpty. Operand 1237 states and 4330 transitions. [2021-07-13 19:53:59,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:59,385 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:59,385 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:53:59,607 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:59,608 INFO L430 AbstractCegarLoop]: === Iteration 72 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:53:59,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:53:59,608 INFO L82 PathProgramCache]: Analyzing trace with hash 495943756, now seen corresponding path program 37 times [2021-07-13 19:53:59,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:53:59,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526604311] [2021-07-13 19:53:59,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:53:59,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:59,626 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:59,627 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:53:59,627 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526604311] [2021-07-13 19:53:59,627 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526604311] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:59,627 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25327762] [2021-07-13 19:53:59,627 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:53:59,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:53:59,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:53:59,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:53:59,713 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:53:59,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25327762] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:53:59,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:53:59,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-07-13 19:53:59,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857171779] [2021-07-13 19:53:59,713 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:53:59,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:53:59,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:53:59,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:53:59,714 INFO L87 Difference]: Start difference. First operand 1237 states and 4330 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:59,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:53:59,892 INFO L93 Difference]: Finished difference Result 1507 states and 5030 transitions. [2021-07-13 19:53:59,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-13 19:53:59,892 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:53:59,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:53:59,895 INFO L225 Difference]: With dead ends: 1507 [2021-07-13 19:53:59,895 INFO L226 Difference]: Without dead ends: 1464 [2021-07-13 19:53:59,895 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 117.7ms TimeCoverageRelationStatistics Valid=135, Invalid=285, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:53:59,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1464 states. [2021-07-13 19:53:59,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1464 to 1278. [2021-07-13 19:53:59,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1278 states, 1277 states have (on average 3.534064212999217) internal successors, (4513), 1277 states have internal predecessors, (4513), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:59,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1278 states to 1278 states and 4513 transitions. [2021-07-13 19:53:59,915 INFO L78 Accepts]: Start accepts. Automaton has 1278 states and 4513 transitions. Word has length 22 [2021-07-13 19:53:59,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:53:59,915 INFO L482 AbstractCegarLoop]: Abstraction has 1278 states and 4513 transitions. [2021-07-13 19:53:59,915 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:53:59,915 INFO L276 IsEmpty]: Start isEmpty. Operand 1278 states and 4513 transitions. [2021-07-13 19:53:59,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:53:59,918 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:53:59,918 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:00,121 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99 [2021-07-13 19:54:00,121 INFO L430 AbstractCegarLoop]: === Iteration 73 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:00,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:00,122 INFO L82 PathProgramCache]: Analyzing trace with hash -112435639, now seen corresponding path program 38 times [2021-07-13 19:54:00,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:00,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954854948] [2021-07-13 19:54:00,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:00,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:00,139 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-07-13 19:54:00,139 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:00,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954854948] [2021-07-13 19:54:00,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954854948] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:00,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982715907] [2021-07-13 19:54:00,139 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:00,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:54:00,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:00,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:00,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:00,219 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:00,219 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982715907] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:00,219 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:00,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-07-13 19:54:00,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199925790] [2021-07-13 19:54:00,220 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:54:00,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:00,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:54:00,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:54:00,220 INFO L87 Difference]: Start difference. First operand 1278 states and 4513 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:00,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:00,378 INFO L93 Difference]: Finished difference Result 1841 states and 5998 transitions. [2021-07-13 19:54:00,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-07-13 19:54:00,378 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:00,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:00,381 INFO L225 Difference]: With dead ends: 1841 [2021-07-13 19:54:00,381 INFO L226 Difference]: Without dead ends: 1832 [2021-07-13 19:54:00,381 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 90.8ms TimeCoverageRelationStatistics Valid=83, Invalid=189, Unknown=0, NotChecked=0, Total=272 [2021-07-13 19:54:00,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1832 states. [2021-07-13 19:54:00,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1832 to 1224. [2021-07-13 19:54:00,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1224 states, 1223 states have (on average 3.493049877350777) internal successors, (4272), 1223 states have internal predecessors, (4272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:00,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1224 states to 1224 states and 4272 transitions. [2021-07-13 19:54:00,401 INFO L78 Accepts]: Start accepts. Automaton has 1224 states and 4272 transitions. Word has length 22 [2021-07-13 19:54:00,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:00,401 INFO L482 AbstractCegarLoop]: Abstraction has 1224 states and 4272 transitions. [2021-07-13 19:54:00,401 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:00,401 INFO L276 IsEmpty]: Start isEmpty. Operand 1224 states and 4272 transitions. [2021-07-13 19:54:00,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:54:00,403 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:00,403 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:00,603 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:00,604 INFO L430 AbstractCegarLoop]: === Iteration 74 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:00,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:00,604 INFO L82 PathProgramCache]: Analyzing trace with hash 38049097, now seen corresponding path program 39 times [2021-07-13 19:54:00,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:00,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681251965] [2021-07-13 19:54:00,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:00,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:00,629 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:00,629 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:00,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681251965] [2021-07-13 19:54:00,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681251965] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:00,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023797136] [2021-07-13 19:54:00,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:00,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:54:00,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:00,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:00,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:00,736 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:00,736 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023797136] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:00,736 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:00,736 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2021-07-13 19:54:00,736 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043212516] [2021-07-13 19:54:00,737 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-07-13 19:54:00,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:00,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-07-13 19:54:00,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:54:00,737 INFO L87 Difference]: Start difference. First operand 1224 states and 4272 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:00,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:00,938 INFO L93 Difference]: Finished difference Result 1811 states and 5904 transitions. [2021-07-13 19:54:00,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-07-13 19:54:00,938 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:00,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:00,942 INFO L225 Difference]: With dead ends: 1811 [2021-07-13 19:54:00,942 INFO L226 Difference]: Without dead ends: 1799 [2021-07-13 19:54:00,942 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 129.1ms TimeCoverageRelationStatistics Valid=118, Invalid=302, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:54:00,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1799 states. [2021-07-13 19:54:00,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1799 to 1222. [2021-07-13 19:54:00,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1222 states, 1221 states have (on average 3.493038493038493) internal successors, (4265), 1221 states have internal predecessors, (4265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:00,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1222 states to 1222 states and 4265 transitions. [2021-07-13 19:54:00,961 INFO L78 Accepts]: Start accepts. Automaton has 1222 states and 4265 transitions. Word has length 22 [2021-07-13 19:54:00,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:00,961 INFO L482 AbstractCegarLoop]: Abstraction has 1222 states and 4265 transitions. [2021-07-13 19:54:00,962 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:00,962 INFO L276 IsEmpty]: Start isEmpty. Operand 1222 states and 4265 transitions. [2021-07-13 19:54:00,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:54:00,963 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:00,963 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:01,164 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2021-07-13 19:54:01,164 INFO L430 AbstractCegarLoop]: === Iteration 75 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:01,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:01,164 INFO L82 PathProgramCache]: Analyzing trace with hash 414299473, now seen corresponding path program 40 times [2021-07-13 19:54:01,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:01,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842546466] [2021-07-13 19:54:01,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:01,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:01,189 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:01,190 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:01,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842546466] [2021-07-13 19:54:01,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842546466] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:01,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921762332] [2021-07-13 19:54:01,190 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:01,224 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:54:01,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:01,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:01,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:01,286 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:01,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921762332] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:01,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:01,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:54:01,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667981288] [2021-07-13 19:54:01,287 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:54:01,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:01,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:54:01,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:54:01,287 INFO L87 Difference]: Start difference. First operand 1222 states and 4265 transitions. Second operand has 10 states, 10 states have (on average 3.7) internal successors, (37), 10 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:01,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:01,436 INFO L93 Difference]: Finished difference Result 2184 states and 7117 transitions. [2021-07-13 19:54:01,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-07-13 19:54:01,436 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 10 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:01,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:01,440 INFO L225 Difference]: With dead ends: 2184 [2021-07-13 19:54:01,440 INFO L226 Difference]: Without dead ends: 2184 [2021-07-13 19:54:01,440 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 87.5ms TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:54:01,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2184 states. [2021-07-13 19:54:01,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2184 to 1282. [2021-07-13 19:54:01,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1282 states, 1281 states have (on average 3.527712724434036) internal successors, (4519), 1281 states have internal predecessors, (4519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:01,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1282 states to 1282 states and 4519 transitions. [2021-07-13 19:54:01,462 INFO L78 Accepts]: Start accepts. Automaton has 1282 states and 4519 transitions. Word has length 22 [2021-07-13 19:54:01,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:01,462 INFO L482 AbstractCegarLoop]: Abstraction has 1282 states and 4519 transitions. [2021-07-13 19:54:01,462 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 10 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:01,462 INFO L276 IsEmpty]: Start isEmpty. Operand 1282 states and 4519 transitions. [2021-07-13 19:54:01,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:54:01,464 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:01,464 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:01,664 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:01,665 INFO L430 AbstractCegarLoop]: === Iteration 76 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:01,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:01,665 INFO L82 PathProgramCache]: Analyzing trace with hash -254499376, now seen corresponding path program 41 times [2021-07-13 19:54:01,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:01,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507260220] [2021-07-13 19:54:01,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:01,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:01,699 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:01,699 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:01,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507260220] [2021-07-13 19:54:01,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507260220] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:01,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748538024] [2021-07-13 19:54:01,699 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:01,744 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:54:01,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:01,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:01,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:01,799 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:01,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748538024] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:01,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:01,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:54:01,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522174284] [2021-07-13 19:54:01,801 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:54:01,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:01,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:54:01,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:54:01,801 INFO L87 Difference]: Start difference. First operand 1282 states and 4519 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:02,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:02,018 INFO L93 Difference]: Finished difference Result 1724 states and 5684 transitions. [2021-07-13 19:54:02,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-07-13 19:54:02,019 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:02,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:02,023 INFO L225 Difference]: With dead ends: 1724 [2021-07-13 19:54:02,023 INFO L226 Difference]: Without dead ends: 1690 [2021-07-13 19:54:02,023 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 138.0ms TimeCoverageRelationStatistics Valid=168, Invalid=294, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:54:02,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1690 states. [2021-07-13 19:54:02,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1690 to 1281. [2021-07-13 19:54:02,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1281 states, 1280 states have (on average 3.51484375) internal successors, (4499), 1280 states have internal predecessors, (4499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:02,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1281 states to 1281 states and 4499 transitions. [2021-07-13 19:54:02,051 INFO L78 Accepts]: Start accepts. Automaton has 1281 states and 4499 transitions. Word has length 22 [2021-07-13 19:54:02,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:02,051 INFO L482 AbstractCegarLoop]: Abstraction has 1281 states and 4499 transitions. [2021-07-13 19:54:02,051 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:02,051 INFO L276 IsEmpty]: Start isEmpty. Operand 1281 states and 4499 transitions. [2021-07-13 19:54:02,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:54:02,054 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:02,054 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:02,275 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2021-07-13 19:54:02,275 INFO L430 AbstractCegarLoop]: === Iteration 77 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:02,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:02,275 INFO L82 PathProgramCache]: Analyzing trace with hash -811023835, now seen corresponding path program 42 times [2021-07-13 19:54:02,275 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:02,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616360271] [2021-07-13 19:54:02,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:02,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:02,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:02,299 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:02,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616360271] [2021-07-13 19:54:02,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616360271] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:02,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116803675] [2021-07-13 19:54:02,300 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:02,334 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:54:02,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:02,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:02,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:02,391 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:02,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116803675] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:02,392 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:02,392 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:54:02,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691814024] [2021-07-13 19:54:02,392 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:54:02,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:02,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:54:02,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:54:02,393 INFO L87 Difference]: Start difference. First operand 1281 states and 4499 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:02,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:02,579 INFO L93 Difference]: Finished difference Result 2125 states and 6947 transitions. [2021-07-13 19:54:02,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-07-13 19:54:02,580 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:02,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:02,583 INFO L225 Difference]: With dead ends: 2125 [2021-07-13 19:54:02,583 INFO L226 Difference]: Without dead ends: 2116 [2021-07-13 19:54:02,583 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 109.9ms TimeCoverageRelationStatistics Valid=114, Invalid=266, Unknown=0, NotChecked=0, Total=380 [2021-07-13 19:54:02,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2116 states. [2021-07-13 19:54:02,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2116 to 1245. [2021-07-13 19:54:02,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1245 states, 1244 states have (on average 3.485530546623794) internal successors, (4336), 1244 states have internal predecessors, (4336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:02,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1245 states to 1245 states and 4336 transitions. [2021-07-13 19:54:02,615 INFO L78 Accepts]: Start accepts. Automaton has 1245 states and 4336 transitions. Word has length 22 [2021-07-13 19:54:02,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:02,616 INFO L482 AbstractCegarLoop]: Abstraction has 1245 states and 4336 transitions. [2021-07-13 19:54:02,616 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:02,616 INFO L276 IsEmpty]: Start isEmpty. Operand 1245 states and 4336 transitions. [2021-07-13 19:54:02,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:54:02,618 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:02,618 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:02,838 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable104 [2021-07-13 19:54:02,839 INFO L430 AbstractCegarLoop]: === Iteration 78 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:02,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:02,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1183450264, now seen corresponding path program 43 times [2021-07-13 19:54:02,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:02,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558103439] [2021-07-13 19:54:02,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:02,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:02,862 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:02,862 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:02,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558103439] [2021-07-13 19:54:02,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558103439] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:02,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445817236] [2021-07-13 19:54:02,862 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:02,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:02,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:02,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:02,946 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:02,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445817236] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:02,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:02,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:54:02,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96408436] [2021-07-13 19:54:02,947 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:54:02,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:02,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:54:02,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:54:02,947 INFO L87 Difference]: Start difference. First operand 1245 states and 4336 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:03,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:03,097 INFO L93 Difference]: Finished difference Result 1497 states and 4889 transitions. [2021-07-13 19:54:03,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:54:03,097 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:03,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:03,099 INFO L225 Difference]: With dead ends: 1497 [2021-07-13 19:54:03,099 INFO L226 Difference]: Without dead ends: 1497 [2021-07-13 19:54:03,100 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 90.6ms TimeCoverageRelationStatistics Valid=89, Invalid=151, Unknown=0, NotChecked=0, Total=240 [2021-07-13 19:54:03,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1497 states. [2021-07-13 19:54:03,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1497 to 1200. [2021-07-13 19:54:03,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1200 states, 1199 states have (on average 3.433694745621351) internal successors, (4117), 1199 states have internal predecessors, (4117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:03,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1200 states to 1200 states and 4117 transitions. [2021-07-13 19:54:03,117 INFO L78 Accepts]: Start accepts. Automaton has 1200 states and 4117 transitions. Word has length 22 [2021-07-13 19:54:03,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:03,117 INFO L482 AbstractCegarLoop]: Abstraction has 1200 states and 4117 transitions. [2021-07-13 19:54:03,117 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:03,117 INFO L276 IsEmpty]: Start isEmpty. Operand 1200 states and 4117 transitions. [2021-07-13 19:54:03,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:54:03,119 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:03,119 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:03,320 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-07-13 19:54:03,320 INFO L430 AbstractCegarLoop]: === Iteration 79 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:03,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:03,320 INFO L82 PathProgramCache]: Analyzing trace with hash -496279263, now seen corresponding path program 44 times [2021-07-13 19:54:03,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:03,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280064117] [2021-07-13 19:54:03,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:03,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:03,342 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:03,342 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:03,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280064117] [2021-07-13 19:54:03,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280064117] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:03,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031169931] [2021-07-13 19:54:03,343 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:03,458 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:54:03,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:03,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:03,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:03,507 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:03,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031169931] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:03,508 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:03,508 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-07-13 19:54:03,508 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92610397] [2021-07-13 19:54:03,508 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-07-13 19:54:03,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:03,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-07-13 19:54:03,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:54:03,508 INFO L87 Difference]: Start difference. First operand 1200 states and 4117 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:03,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:03,650 INFO L93 Difference]: Finished difference Result 1698 states and 5519 transitions. [2021-07-13 19:54:03,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-07-13 19:54:03,651 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:03,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:03,654 INFO L225 Difference]: With dead ends: 1698 [2021-07-13 19:54:03,654 INFO L226 Difference]: Without dead ends: 1690 [2021-07-13 19:54:03,654 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 97.8ms TimeCoverageRelationStatistics Valid=101, Invalid=241, Unknown=0, NotChecked=0, Total=342 [2021-07-13 19:54:03,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1690 states. [2021-07-13 19:54:03,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1690 to 1200. [2021-07-13 19:54:03,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1200 states, 1199 states have (on average 3.4286905754795662) internal successors, (4111), 1199 states have internal predecessors, (4111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:03,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1200 states to 1200 states and 4111 transitions. [2021-07-13 19:54:03,680 INFO L78 Accepts]: Start accepts. Automaton has 1200 states and 4111 transitions. Word has length 22 [2021-07-13 19:54:03,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:03,680 INFO L482 AbstractCegarLoop]: Abstraction has 1200 states and 4111 transitions. [2021-07-13 19:54:03,680 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:03,680 INFO L276 IsEmpty]: Start isEmpty. Operand 1200 states and 4111 transitions. [2021-07-13 19:54:03,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:54:03,682 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:03,683 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:03,904 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:03,905 INFO L430 AbstractCegarLoop]: === Iteration 80 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:03,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:03,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1029973939, now seen corresponding path program 45 times [2021-07-13 19:54:03,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:03,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683756667] [2021-07-13 19:54:03,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:03,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:03,929 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:03,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:03,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683756667] [2021-07-13 19:54:03,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683756667] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:03,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510080177] [2021-07-13 19:54:03,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:03,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:54:03,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:03,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:03,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:04,018 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:04,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510080177] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:04,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:04,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-07-13 19:54:04,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647777160] [2021-07-13 19:54:04,020 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-13 19:54:04,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:04,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-13 19:54:04,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:54:04,021 INFO L87 Difference]: Start difference. First operand 1200 states and 4111 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:04,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:04,097 INFO L93 Difference]: Finished difference Result 1428 states and 4807 transitions. [2021-07-13 19:54:04,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-07-13 19:54:04,098 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:04,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:04,101 INFO L225 Difference]: With dead ends: 1428 [2021-07-13 19:54:04,101 INFO L226 Difference]: Without dead ends: 1419 [2021-07-13 19:54:04,101 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 62.5ms TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2021-07-13 19:54:04,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1419 states. [2021-07-13 19:54:04,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1419 to 1199. [2021-07-13 19:54:04,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1199 states, 1198 states have (on average 3.4298831385642736) internal successors, (4109), 1198 states have internal predecessors, (4109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:04,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1199 states to 1199 states and 4109 transitions. [2021-07-13 19:54:04,124 INFO L78 Accepts]: Start accepts. Automaton has 1199 states and 4109 transitions. Word has length 22 [2021-07-13 19:54:04,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:04,124 INFO L482 AbstractCegarLoop]: Abstraction has 1199 states and 4109 transitions. [2021-07-13 19:54:04,124 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:04,124 INFO L276 IsEmpty]: Start isEmpty. Operand 1199 states and 4109 transitions. [2021-07-13 19:54:04,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-07-13 19:54:04,127 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:04,127 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:04,340 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2021-07-13 19:54:04,340 INFO L430 AbstractCegarLoop]: === Iteration 81 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:04,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:04,340 INFO L82 PathProgramCache]: Analyzing trace with hash -736606674, now seen corresponding path program 46 times [2021-07-13 19:54:04,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:04,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815195393] [2021-07-13 19:54:04,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:04,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:04,363 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:04,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:04,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815195393] [2021-07-13 19:54:04,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815195393] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:04,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265310347] [2021-07-13 19:54:04,364 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:04,398 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:54:04,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:04,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:54:04,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:04,452 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:04,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265310347] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:04,453 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:04,453 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-07-13 19:54:04,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970373895] [2021-07-13 19:54:04,453 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-13 19:54:04,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:04,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-13 19:54:04,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:54:04,453 INFO L87 Difference]: Start difference. First operand 1199 states and 4109 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:04,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:04,527 INFO L93 Difference]: Finished difference Result 1470 states and 4948 transitions. [2021-07-13 19:54:04,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-07-13 19:54:04,527 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-07-13 19:54:04,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:04,530 INFO L225 Difference]: With dead ends: 1470 [2021-07-13 19:54:04,530 INFO L226 Difference]: Without dead ends: 1470 [2021-07-13 19:54:04,530 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 54.8ms TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:54:04,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1470 states. [2021-07-13 19:54:04,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1470 to 1208. [2021-07-13 19:54:04,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1208 states, 1207 states have (on average 3.432477216238608) internal successors, (4143), 1207 states have internal predecessors, (4143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:04,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1208 states to 1208 states and 4143 transitions. [2021-07-13 19:54:04,545 INFO L78 Accepts]: Start accepts. Automaton has 1208 states and 4143 transitions. Word has length 22 [2021-07-13 19:54:04,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:04,545 INFO L482 AbstractCegarLoop]: Abstraction has 1208 states and 4143 transitions. [2021-07-13 19:54:04,545 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:04,546 INFO L276 IsEmpty]: Start isEmpty. Operand 1208 states and 4143 transitions. [2021-07-13 19:54:04,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:04,547 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:04,547 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:04,748 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108,70 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:04,748 INFO L430 AbstractCegarLoop]: === Iteration 82 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:04,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:04,748 INFO L82 PathProgramCache]: Analyzing trace with hash -834579384, now seen corresponding path program 47 times [2021-07-13 19:54:04,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:04,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81261017] [2021-07-13 19:54:04,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:04,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:04,959 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:04,959 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:04,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81261017] [2021-07-13 19:54:04,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81261017] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:04,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700505108] [2021-07-13 19:54:04,960 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:04,988 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:54:04,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:04,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:04,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:05,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:05,145 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:05,146 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:05,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:05,147 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 19:54:05,177 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:05,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700505108] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:05,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:05,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:05,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363622914] [2021-07-13 19:54:05,178 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:05,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:05,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:05,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:05,179 INFO L87 Difference]: Start difference. First operand 1208 states and 4143 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:08,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:08,952 INFO L93 Difference]: Finished difference Result 4448 states and 15165 transitions. [2021-07-13 19:54:08,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-07-13 19:54:08,952 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:08,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:08,960 INFO L225 Difference]: With dead ends: 4448 [2021-07-13 19:54:08,960 INFO L226 Difference]: Without dead ends: 4426 [2021-07-13 19:54:08,960 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2192 ImplicationChecksByTransitivity, 2984.8ms TimeCoverageRelationStatistics Valid=1022, Invalid=5620, Unknown=0, NotChecked=0, Total=6642 [2021-07-13 19:54:08,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4426 states. [2021-07-13 19:54:08,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4426 to 1303. [2021-07-13 19:54:08,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1303 states, 1302 states have (on average 3.4400921658986174) internal successors, (4479), 1302 states have internal predecessors, (4479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:09,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1303 states to 1303 states and 4479 transitions. [2021-07-13 19:54:09,012 INFO L78 Accepts]: Start accepts. Automaton has 1303 states and 4479 transitions. Word has length 24 [2021-07-13 19:54:09,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:09,012 INFO L482 AbstractCegarLoop]: Abstraction has 1303 states and 4479 transitions. [2021-07-13 19:54:09,012 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:09,012 INFO L276 IsEmpty]: Start isEmpty. Operand 1303 states and 4479 transitions. [2021-07-13 19:54:09,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:09,014 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:09,015 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:09,215 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable109 [2021-07-13 19:54:09,215 INFO L430 AbstractCegarLoop]: === Iteration 83 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:09,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:09,215 INFO L82 PathProgramCache]: Analyzing trace with hash 965720304, now seen corresponding path program 48 times [2021-07-13 19:54:09,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:09,216 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653911097] [2021-07-13 19:54:09,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:09,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:09,430 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:09,430 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:09,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653911097] [2021-07-13 19:54:09,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653911097] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:09,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230987557] [2021-07-13 19:54:09,430 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:09,458 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:54:09,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:09,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 19:54:09,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:09,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:09,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:09,684 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:09,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 33 treesize of output 53 [2021-07-13 19:54:09,712 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:09,757 INFO L628 ElimStorePlain]: treesize reduction 37, result has 49.3 percent of original size [2021-07-13 19:54:09,760 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:09,761 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:44, output treesize:41 [2021-07-13 19:54:09,873 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:09,873 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230987557] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:09,873 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:09,873 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 21 [2021-07-13 19:54:09,873 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427924069] [2021-07-13 19:54:09,874 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:54:09,874 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:09,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:54:09,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:54:09,874 INFO L87 Difference]: Start difference. First operand 1303 states and 4479 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:12,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:12,896 INFO L93 Difference]: Finished difference Result 2829 states and 9372 transitions. [2021-07-13 19:54:12,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-07-13 19:54:12,896 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:12,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:12,901 INFO L225 Difference]: With dead ends: 2829 [2021-07-13 19:54:12,901 INFO L226 Difference]: Without dead ends: 2799 [2021-07-13 19:54:12,901 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1118 ImplicationChecksByTransitivity, 2424.9ms TimeCoverageRelationStatistics Valid=661, Invalid=3121, Unknown=0, NotChecked=0, Total=3782 [2021-07-13 19:54:12,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2799 states. [2021-07-13 19:54:12,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2799 to 1316. [2021-07-13 19:54:12,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1316 states, 1315 states have (on average 3.4403041825095055) internal successors, (4524), 1315 states have internal predecessors, (4524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:12,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1316 states to 1316 states and 4524 transitions. [2021-07-13 19:54:12,925 INFO L78 Accepts]: Start accepts. Automaton has 1316 states and 4524 transitions. Word has length 24 [2021-07-13 19:54:12,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:12,925 INFO L482 AbstractCegarLoop]: Abstraction has 1316 states and 4524 transitions. [2021-07-13 19:54:12,925 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:12,925 INFO L276 IsEmpty]: Start isEmpty. Operand 1316 states and 4524 transitions. [2021-07-13 19:54:12,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:12,927 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:12,927 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:13,128 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,72 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:13,128 INFO L430 AbstractCegarLoop]: === Iteration 84 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:13,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:13,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1186871304, now seen corresponding path program 49 times [2021-07-13 19:54:13,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:13,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526810596] [2021-07-13 19:54:13,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:13,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:13,385 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:13,386 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:13,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526810596] [2021-07-13 19:54:13,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526810596] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:13,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029661414] [2021-07-13 19:54:13,386 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:13,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:13,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:13,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:13,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:13,609 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:13,610 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:13,611 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:13,611 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:54:13,655 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:13,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029661414] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:13,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:13,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:13,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766914059] [2021-07-13 19:54:13,656 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:13,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:13,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:13,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:13,656 INFO L87 Difference]: Start difference. First operand 1316 states and 4524 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:15,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:15,522 INFO L93 Difference]: Finished difference Result 2754 states and 9152 transitions. [2021-07-13 19:54:15,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-07-13 19:54:15,523 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:15,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:15,528 INFO L225 Difference]: With dead ends: 2754 [2021-07-13 19:54:15,528 INFO L226 Difference]: Without dead ends: 2720 [2021-07-13 19:54:15,528 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 621 ImplicationChecksByTransitivity, 1439.7ms TimeCoverageRelationStatistics Valid=379, Invalid=2171, Unknown=0, NotChecked=0, Total=2550 [2021-07-13 19:54:15,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2720 states. [2021-07-13 19:54:15,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2720 to 1330. [2021-07-13 19:54:15,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1330 states, 1329 states have (on average 3.443190368698269) internal successors, (4576), 1329 states have internal predecessors, (4576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:15,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1330 states to 1330 states and 4576 transitions. [2021-07-13 19:54:15,552 INFO L78 Accepts]: Start accepts. Automaton has 1330 states and 4576 transitions. Word has length 24 [2021-07-13 19:54:15,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:15,552 INFO L482 AbstractCegarLoop]: Abstraction has 1330 states and 4576 transitions. [2021-07-13 19:54:15,552 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:15,552 INFO L276 IsEmpty]: Start isEmpty. Operand 1330 states and 4576 transitions. [2021-07-13 19:54:15,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:15,554 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:15,554 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:15,766 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119,73 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:15,767 INFO L430 AbstractCegarLoop]: === Iteration 85 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:15,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:15,767 INFO L82 PathProgramCache]: Analyzing trace with hash 749372208, now seen corresponding path program 50 times [2021-07-13 19:54:15,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:15,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053029352] [2021-07-13 19:54:15,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:15,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:15,985 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:15,985 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:15,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053029352] [2021-07-13 19:54:15,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053029352] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:15,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87721795] [2021-07-13 19:54:15,985 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:16,014 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:54:16,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:16,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 37 conjunts are in the unsatisfiable core [2021-07-13 19:54:16,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:16,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:16,205 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:16,219 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:16,220 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:16,220 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:29, output treesize:15 [2021-07-13 19:54:16,275 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:16,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87721795] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:16,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:16,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:54:16,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905451780] [2021-07-13 19:54:16,275 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:54:16,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:16,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:54:16,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=501, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:54:16,276 INFO L87 Difference]: Start difference. First operand 1330 states and 4576 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:17,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:17,481 INFO L93 Difference]: Finished difference Result 2450 states and 8194 transitions. [2021-07-13 19:54:17,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-07-13 19:54:17,482 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:17,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:17,486 INFO L225 Difference]: With dead ends: 2450 [2021-07-13 19:54:17,486 INFO L226 Difference]: Without dead ends: 2391 [2021-07-13 19:54:17,487 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 931.9ms TimeCoverageRelationStatistics Valid=289, Invalid=1517, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:54:17,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2391 states. [2021-07-13 19:54:17,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2391 to 1349. [2021-07-13 19:54:17,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1349 states, 1348 states have (on average 3.438427299703264) internal successors, (4635), 1348 states have internal predecessors, (4635), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:17,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1349 states to 1349 states and 4635 transitions. [2021-07-13 19:54:17,510 INFO L78 Accepts]: Start accepts. Automaton has 1349 states and 4635 transitions. Word has length 24 [2021-07-13 19:54:17,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:17,510 INFO L482 AbstractCegarLoop]: Abstraction has 1349 states and 4635 transitions. [2021-07-13 19:54:17,510 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:17,510 INFO L276 IsEmpty]: Start isEmpty. Operand 1349 states and 4635 transitions. [2021-07-13 19:54:17,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:17,512 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:17,512 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:17,713 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:17,713 INFO L430 AbstractCegarLoop]: === Iteration 86 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:17,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:17,713 INFO L82 PathProgramCache]: Analyzing trace with hash 572830776, now seen corresponding path program 51 times [2021-07-13 19:54:17,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:17,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511869595] [2021-07-13 19:54:17,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:17,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:17,916 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:17,916 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:17,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511869595] [2021-07-13 19:54:17,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511869595] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:17,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699550510] [2021-07-13 19:54:17,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:17,944 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-13 19:54:17,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:17,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:17,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:18,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:18,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:18,130 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:18,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 25 treesize of output 53 [2021-07-13 19:54:18,132 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:18,149 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:18,150 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:18,150 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:38, output treesize:50 [2021-07-13 19:54:18,361 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:18,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699550510] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:18,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:18,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:54:18,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756466158] [2021-07-13 19:54:18,362 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:54:18,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:18,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:54:18,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:54:18,363 INFO L87 Difference]: Start difference. First operand 1349 states and 4635 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:20,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:20,249 INFO L93 Difference]: Finished difference Result 2472 states and 8251 transitions. [2021-07-13 19:54:20,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 19:54:20,250 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:20,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:20,255 INFO L225 Difference]: With dead ends: 2472 [2021-07-13 19:54:20,255 INFO L226 Difference]: Without dead ends: 2452 [2021-07-13 19:54:20,255 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 882 ImplicationChecksByTransitivity, 1672.8ms TimeCoverageRelationStatistics Valid=478, Invalid=2602, Unknown=0, NotChecked=0, Total=3080 [2021-07-13 19:54:20,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2452 states. [2021-07-13 19:54:20,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2452 to 1352. [2021-07-13 19:54:20,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1352 states, 1351 states have (on average 3.4374537379718726) internal successors, (4644), 1351 states have internal predecessors, (4644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:20,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1352 states to 1352 states and 4644 transitions. [2021-07-13 19:54:20,279 INFO L78 Accepts]: Start accepts. Automaton has 1352 states and 4644 transitions. Word has length 24 [2021-07-13 19:54:20,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:20,279 INFO L482 AbstractCegarLoop]: Abstraction has 1352 states and 4644 transitions. [2021-07-13 19:54:20,279 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:20,279 INFO L276 IsEmpty]: Start isEmpty. Operand 1352 states and 4644 transitions. [2021-07-13 19:54:20,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:20,281 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:20,281 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:20,482 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,75 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:20,482 INFO L430 AbstractCegarLoop]: === Iteration 87 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:20,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:20,483 INFO L82 PathProgramCache]: Analyzing trace with hash -260907664, now seen corresponding path program 52 times [2021-07-13 19:54:20,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:20,483 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406304389] [2021-07-13 19:54:20,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:20,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:20,705 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:20,705 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:20,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406304389] [2021-07-13 19:54:20,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406304389] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:20,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198055860] [2021-07-13 19:54:20,706 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:20,743 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:54:20,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:20,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:20,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:20,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:54:20,864 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:20,867 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:20,867 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:20,867 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:54:20,928 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:20,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198055860] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:20,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:20,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:54:20,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822865431] [2021-07-13 19:54:20,929 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:54:20,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:20,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:54:20,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:54:20,929 INFO L87 Difference]: Start difference. First operand 1352 states and 4644 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:21,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:21,945 INFO L93 Difference]: Finished difference Result 2456 states and 8262 transitions. [2021-07-13 19:54:21,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 19:54:21,946 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:21,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:21,950 INFO L225 Difference]: With dead ends: 2456 [2021-07-13 19:54:21,950 INFO L226 Difference]: Without dead ends: 2445 [2021-07-13 19:54:21,950 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 874.4ms TimeCoverageRelationStatistics Valid=271, Invalid=1451, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:54:21,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2445 states. [2021-07-13 19:54:21,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2445 to 1353. [2021-07-13 19:54:21,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1353 states, 1352 states have (on average 3.44008875739645) internal successors, (4651), 1352 states have internal predecessors, (4651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:21,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1353 states to 1353 states and 4651 transitions. [2021-07-13 19:54:21,972 INFO L78 Accepts]: Start accepts. Automaton has 1353 states and 4651 transitions. Word has length 24 [2021-07-13 19:54:21,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:21,972 INFO L482 AbstractCegarLoop]: Abstraction has 1353 states and 4651 transitions. [2021-07-13 19:54:21,972 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:21,972 INFO L276 IsEmpty]: Start isEmpty. Operand 1353 states and 4651 transitions. [2021-07-13 19:54:21,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:21,974 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:21,975 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:22,175 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126,76 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:22,175 INFO L430 AbstractCegarLoop]: === Iteration 88 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:22,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:22,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1760921938, now seen corresponding path program 1 times [2021-07-13 19:54:22,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:22,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936963195] [2021-07-13 19:54:22,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:22,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:22,408 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:22,408 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:22,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936963195] [2021-07-13 19:54:22,408 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936963195] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:22,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323047434] [2021-07-13 19:54:22,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:22,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:22,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:22,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:22,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:22,598 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:22,599 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:22,600 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:22,600 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 19:54:22,633 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:22,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323047434] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:22,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:22,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:22,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953416867] [2021-07-13 19:54:22,633 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:22,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:22,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:22,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:22,634 INFO L87 Difference]: Start difference. First operand 1353 states and 4651 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:25,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:25,787 INFO L93 Difference]: Finished difference Result 3805 states and 13021 transitions. [2021-07-13 19:54:25,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-07-13 19:54:25,787 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:25,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:25,794 INFO L225 Difference]: With dead ends: 3805 [2021-07-13 19:54:25,794 INFO L226 Difference]: Without dead ends: 3786 [2021-07-13 19:54:25,795 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1512 ImplicationChecksByTransitivity, 2549.1ms TimeCoverageRelationStatistics Valid=761, Invalid=4351, Unknown=0, NotChecked=0, Total=5112 [2021-07-13 19:54:25,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3786 states. [2021-07-13 19:54:25,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3786 to 1388. [2021-07-13 19:54:25,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1388 states, 1387 states have (on average 3.4491708723864454) internal successors, (4784), 1387 states have internal predecessors, (4784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:25,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1388 states to 1388 states and 4784 transitions. [2021-07-13 19:54:25,826 INFO L78 Accepts]: Start accepts. Automaton has 1388 states and 4784 transitions. Word has length 24 [2021-07-13 19:54:25,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:25,826 INFO L482 AbstractCegarLoop]: Abstraction has 1388 states and 4784 transitions. [2021-07-13 19:54:25,826 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:25,826 INFO L276 IsEmpty]: Start isEmpty. Operand 1388 states and 4784 transitions. [2021-07-13 19:54:25,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:25,828 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:25,829 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:26,030 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127,77 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:26,030 INFO L430 AbstractCegarLoop]: === Iteration 89 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:26,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:26,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1251406074, now seen corresponding path program 2 times [2021-07-13 19:54:26,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:26,031 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79814361] [2021-07-13 19:54:26,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:26,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:26,247 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:26,247 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:26,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79814361] [2021-07-13 19:54:26,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79814361] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:26,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590331702] [2021-07-13 19:54:26,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:26,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:54:26,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:26,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:54:26,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:26,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:26,561 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:54:26,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:26,562 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:26,568 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:26,569 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:26,569 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:54:26,604 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:26,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590331702] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:26,604 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:26,604 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:54:26,605 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954104912] [2021-07-13 19:54:26,605 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:54:26,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:26,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:54:26,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:54:26,605 INFO L87 Difference]: Start difference. First operand 1388 states and 4784 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:28,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:28,195 INFO L93 Difference]: Finished difference Result 2357 states and 8002 transitions. [2021-07-13 19:54:28,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-07-13 19:54:28,196 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:28,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:28,200 INFO L225 Difference]: With dead ends: 2357 [2021-07-13 19:54:28,200 INFO L226 Difference]: Without dead ends: 2348 [2021-07-13 19:54:28,200 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 1376.5ms TimeCoverageRelationStatistics Valid=376, Invalid=2276, Unknown=0, NotChecked=0, Total=2652 [2021-07-13 19:54:28,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2348 states. [2021-07-13 19:54:28,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2348 to 1398. [2021-07-13 19:54:28,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1398 states, 1397 states have (on average 3.45025053686471) internal successors, (4820), 1397 states have internal predecessors, (4820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:28,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1398 states to 1398 states and 4820 transitions. [2021-07-13 19:54:28,221 INFO L78 Accepts]: Start accepts. Automaton has 1398 states and 4820 transitions. Word has length 24 [2021-07-13 19:54:28,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:28,222 INFO L482 AbstractCegarLoop]: Abstraction has 1398 states and 4820 transitions. [2021-07-13 19:54:28,222 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:28,222 INFO L276 IsEmpty]: Start isEmpty. Operand 1398 states and 4820 transitions. [2021-07-13 19:54:28,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:28,224 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:28,224 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:28,424 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable128 [2021-07-13 19:54:28,425 INFO L430 AbstractCegarLoop]: === Iteration 90 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:28,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:28,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1041868694, now seen corresponding path program 3 times [2021-07-13 19:54:28,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:28,426 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822211604] [2021-07-13 19:54:28,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:28,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:28,659 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:28,660 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:28,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822211604] [2021-07-13 19:54:28,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822211604] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:28,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132475407] [2021-07-13 19:54:28,660 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:28,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:54:28,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:28,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:28,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:28,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:28,840 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:28,841 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:28,842 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:28,842 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 19:54:28,871 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:28,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132475407] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:28,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:28,872 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:28,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893019952] [2021-07-13 19:54:28,872 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:28,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:28,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:28,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:28,872 INFO L87 Difference]: Start difference. First operand 1398 states and 4820 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:30,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:30,577 INFO L93 Difference]: Finished difference Result 2538 states and 8518 transitions. [2021-07-13 19:54:30,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 19:54:30,578 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:30,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:30,582 INFO L225 Difference]: With dead ends: 2538 [2021-07-13 19:54:30,582 INFO L226 Difference]: Without dead ends: 2509 [2021-07-13 19:54:30,583 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 1263.3ms TimeCoverageRelationStatistics Valid=348, Invalid=2004, Unknown=0, NotChecked=0, Total=2352 [2021-07-13 19:54:30,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2509 states. [2021-07-13 19:54:30,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2509 to 1408. [2021-07-13 19:54:30,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1408 states, 1407 states have (on average 3.4534470504619756) internal successors, (4859), 1407 states have internal predecessors, (4859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:30,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1408 states to 1408 states and 4859 transitions. [2021-07-13 19:54:30,608 INFO L78 Accepts]: Start accepts. Automaton has 1408 states and 4859 transitions. Word has length 24 [2021-07-13 19:54:30,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:30,608 INFO L482 AbstractCegarLoop]: Abstraction has 1408 states and 4859 transitions. [2021-07-13 19:54:30,608 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:30,608 INFO L276 IsEmpty]: Start isEmpty. Operand 1408 states and 4859 transitions. [2021-07-13 19:54:30,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:30,610 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:30,610 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:30,824 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable129 [2021-07-13 19:54:30,825 INFO L430 AbstractCegarLoop]: === Iteration 91 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:30,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:30,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1524426856, now seen corresponding path program 4 times [2021-07-13 19:54:30,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:30,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591669481] [2021-07-13 19:54:30,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:30,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:31,054 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:31,055 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:31,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591669481] [2021-07-13 19:54:31,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591669481] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:31,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056543760] [2021-07-13 19:54:31,055 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:31,082 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:54:31,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:31,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:31,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:31,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:31,234 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:31,235 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:31,236 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:31,236 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:54:31,265 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:31,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056543760] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:31,266 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:31,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:31,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575861971] [2021-07-13 19:54:31,266 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:31,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:31,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:31,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:31,266 INFO L87 Difference]: Start difference. First operand 1408 states and 4859 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:32,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:32,754 INFO L93 Difference]: Finished difference Result 2473 states and 8324 transitions. [2021-07-13 19:54:32,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:54:32,754 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:32,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:32,758 INFO L225 Difference]: With dead ends: 2473 [2021-07-13 19:54:32,758 INFO L226 Difference]: Without dead ends: 2444 [2021-07-13 19:54:32,759 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 1182.2ms TimeCoverageRelationStatistics Valid=348, Invalid=1908, Unknown=0, NotChecked=0, Total=2256 [2021-07-13 19:54:32,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2444 states. [2021-07-13 19:54:32,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2444 to 1402. [2021-07-13 19:54:32,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1402 states, 1401 states have (on average 3.457530335474661) internal successors, (4844), 1401 states have internal predecessors, (4844), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:32,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1402 states to 1402 states and 4844 transitions. [2021-07-13 19:54:32,783 INFO L78 Accepts]: Start accepts. Automaton has 1402 states and 4844 transitions. Word has length 24 [2021-07-13 19:54:32,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:32,784 INFO L482 AbstractCegarLoop]: Abstraction has 1402 states and 4844 transitions. [2021-07-13 19:54:32,784 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:32,784 INFO L276 IsEmpty]: Start isEmpty. Operand 1402 states and 4844 transitions. [2021-07-13 19:54:32,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:32,786 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:32,786 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:32,986 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130,80 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:32,986 INFO L430 AbstractCegarLoop]: === Iteration 92 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:32,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:32,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1742390580, now seen corresponding path program 5 times [2021-07-13 19:54:32,987 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:32,987 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045339773] [2021-07-13 19:54:32,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:32,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:33,190 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:33,191 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:33,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045339773] [2021-07-13 19:54:33,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045339773] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:33,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582801238] [2021-07-13 19:54:33,191 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:33,233 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:54:33,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:33,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:33,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:33,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:54:33,362 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:33,365 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:33,366 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:33,366 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:54:33,413 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:33,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582801238] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:33,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:33,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:54:33,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334286892] [2021-07-13 19:54:33,413 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:54:33,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:33,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:54:33,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:54:33,414 INFO L87 Difference]: Start difference. First operand 1402 states and 4844 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:34,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:34,173 INFO L93 Difference]: Finished difference Result 2298 states and 7819 transitions. [2021-07-13 19:54:34,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:54:34,173 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:34,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:34,177 INFO L225 Difference]: With dead ends: 2298 [2021-07-13 19:54:34,177 INFO L226 Difference]: Without dead ends: 2289 [2021-07-13 19:54:34,177 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 686.7ms TimeCoverageRelationStatistics Valid=210, Invalid=1050, Unknown=0, NotChecked=0, Total=1260 [2021-07-13 19:54:34,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2289 states. [2021-07-13 19:54:34,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2289 to 1415. [2021-07-13 19:54:34,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1415 states, 1414 states have (on average 3.454031117397454) internal successors, (4884), 1414 states have internal predecessors, (4884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:34,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1415 states to 1415 states and 4884 transitions. [2021-07-13 19:54:34,198 INFO L78 Accepts]: Start accepts. Automaton has 1415 states and 4884 transitions. Word has length 24 [2021-07-13 19:54:34,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:34,198 INFO L482 AbstractCegarLoop]: Abstraction has 1415 states and 4884 transitions. [2021-07-13 19:54:34,198 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:34,198 INFO L276 IsEmpty]: Start isEmpty. Operand 1415 states and 4884 transitions. [2021-07-13 19:54:34,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:34,200 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:34,200 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:34,400 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131,81 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:34,401 INFO L430 AbstractCegarLoop]: === Iteration 93 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:34,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:34,401 INFO L82 PathProgramCache]: Analyzing trace with hash 2065976758, now seen corresponding path program 6 times [2021-07-13 19:54:34,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:34,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264283459] [2021-07-13 19:54:34,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:34,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:34,604 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:34,604 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:34,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264283459] [2021-07-13 19:54:34,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264283459] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:34,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722272568] [2021-07-13 19:54:34,604 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:34,649 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:54:34,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:34,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 29 conjunts are in the unsatisfiable core [2021-07-13 19:54:34,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:34,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:34,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:34,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:34,855 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:34,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 43 [2021-07-13 19:54:34,857 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:34,874 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:34,887 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:34,887 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:88 [2021-07-13 19:54:35,005 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:35,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722272568] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:35,006 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:35,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:54:35,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482876153] [2021-07-13 19:54:35,006 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:54:35,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:35,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:54:35,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:54:35,006 INFO L87 Difference]: Start difference. First operand 1415 states and 4884 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:36,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:36,920 INFO L93 Difference]: Finished difference Result 2286 states and 7759 transitions. [2021-07-13 19:54:36,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-07-13 19:54:36,920 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:36,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:36,924 INFO L225 Difference]: With dead ends: 2286 [2021-07-13 19:54:36,924 INFO L226 Difference]: Without dead ends: 2277 [2021-07-13 19:54:36,924 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 737 ImplicationChecksByTransitivity, 1768.4ms TimeCoverageRelationStatistics Valid=540, Invalid=2322, Unknown=0, NotChecked=0, Total=2862 [2021-07-13 19:54:36,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2277 states. [2021-07-13 19:54:36,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2277 to 1418. [2021-07-13 19:54:36,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1418 states, 1417 states have (on average 3.455892731122089) internal successors, (4897), 1417 states have internal predecessors, (4897), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:36,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1418 states to 1418 states and 4897 transitions. [2021-07-13 19:54:36,946 INFO L78 Accepts]: Start accepts. Automaton has 1418 states and 4897 transitions. Word has length 24 [2021-07-13 19:54:36,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:36,946 INFO L482 AbstractCegarLoop]: Abstraction has 1418 states and 4897 transitions. [2021-07-13 19:54:36,946 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:36,946 INFO L276 IsEmpty]: Start isEmpty. Operand 1418 states and 4897 transitions. [2021-07-13 19:54:36,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:36,948 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:36,948 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:37,149 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132,82 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:37,149 INFO L430 AbstractCegarLoop]: === Iteration 94 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:37,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:37,149 INFO L82 PathProgramCache]: Analyzing trace with hash -543246416, now seen corresponding path program 7 times [2021-07-13 19:54:37,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:37,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203881609] [2021-07-13 19:54:37,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:37,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:37,338 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:37,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:37,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203881609] [2021-07-13 19:54:37,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203881609] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:37,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231392] [2021-07-13 19:54:37,338 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:37,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:37,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:37,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:37,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:54:37,515 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:37,518 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:37,518 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:37,518 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:54:37,563 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:37,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231392] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:37,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:37,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:54:37,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738231137] [2021-07-13 19:54:37,563 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:54:37,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:37,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:54:37,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:54:37,570 INFO L87 Difference]: Start difference. First operand 1418 states and 4897 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:38,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:38,425 INFO L93 Difference]: Finished difference Result 2241 states and 7629 transitions. [2021-07-13 19:54:38,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-07-13 19:54:38,425 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:38,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:38,429 INFO L225 Difference]: With dead ends: 2241 [2021-07-13 19:54:38,429 INFO L226 Difference]: Without dead ends: 2230 [2021-07-13 19:54:38,429 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 679.8ms TimeCoverageRelationStatistics Valid=178, Invalid=1012, Unknown=0, NotChecked=0, Total=1190 [2021-07-13 19:54:38,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2230 states. [2021-07-13 19:54:38,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2230 to 1410. [2021-07-13 19:54:38,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1410 states, 1409 states have (on average 3.4570617459190918) internal successors, (4871), 1409 states have internal predecessors, (4871), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:38,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1410 states to 1410 states and 4871 transitions. [2021-07-13 19:54:38,451 INFO L78 Accepts]: Start accepts. Automaton has 1410 states and 4871 transitions. Word has length 24 [2021-07-13 19:54:38,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:38,451 INFO L482 AbstractCegarLoop]: Abstraction has 1410 states and 4871 transitions. [2021-07-13 19:54:38,451 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:38,451 INFO L276 IsEmpty]: Start isEmpty. Operand 1410 states and 4871 transitions. [2021-07-13 19:54:38,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:38,454 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:38,454 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:38,676 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable138 [2021-07-13 19:54:38,677 INFO L430 AbstractCegarLoop]: === Iteration 95 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:38,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:38,677 INFO L82 PathProgramCache]: Analyzing trace with hash 1059751936, now seen corresponding path program 53 times [2021-07-13 19:54:38,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:38,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761431232] [2021-07-13 19:54:38,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:38,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:38,883 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:38,883 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:38,883 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761431232] [2021-07-13 19:54:38,883 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761431232] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:38,883 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550556424] [2021-07-13 19:54:38,883 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:38,914 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:54:38,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:38,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:38,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:39,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:39,085 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:39,086 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:39,087 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:39,087 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:54:39,118 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:39,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550556424] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:39,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:39,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:39,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758323170] [2021-07-13 19:54:39,118 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:39,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:39,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:39,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:39,119 INFO L87 Difference]: Start difference. First operand 1410 states and 4871 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:40,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:40,308 INFO L93 Difference]: Finished difference Result 2280 states and 7676 transitions. [2021-07-13 19:54:40,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-07-13 19:54:40,308 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:40,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:40,312 INFO L225 Difference]: With dead ends: 2280 [2021-07-13 19:54:40,312 INFO L226 Difference]: Without dead ends: 2270 [2021-07-13 19:54:40,312 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 799.8ms TimeCoverageRelationStatistics Valid=245, Invalid=1647, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 19:54:40,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2270 states. [2021-07-13 19:54:40,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2270 to 1412. [2021-07-13 19:54:40,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1412 states, 1411 states have (on average 3.4564138908575477) internal successors, (4877), 1411 states have internal predecessors, (4877), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:40,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1412 states to 1412 states and 4877 transitions. [2021-07-13 19:54:40,333 INFO L78 Accepts]: Start accepts. Automaton has 1412 states and 4877 transitions. Word has length 24 [2021-07-13 19:54:40,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:40,334 INFO L482 AbstractCegarLoop]: Abstraction has 1412 states and 4877 transitions. [2021-07-13 19:54:40,334 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:40,334 INFO L276 IsEmpty]: Start isEmpty. Operand 1412 states and 4877 transitions. [2021-07-13 19:54:40,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:40,336 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:40,336 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:40,536 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable139 [2021-07-13 19:54:40,536 INFO L430 AbstractCegarLoop]: === Iteration 96 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:40,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:40,537 INFO L82 PathProgramCache]: Analyzing trace with hash -448330122, now seen corresponding path program 54 times [2021-07-13 19:54:40,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:40,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308639724] [2021-07-13 19:54:40,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:40,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:40,721 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:40,721 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:40,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308639724] [2021-07-13 19:54:40,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308639724] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:40,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586908785] [2021-07-13 19:54:40,721 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:40,750 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:54:40,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:40,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 19:54:40,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:41,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:41,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:41,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:41,045 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:41,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 38 [2021-07-13 19:54:41,054 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:54:41,081 INFO L628 ElimStorePlain]: treesize reduction 29, result has 52.5 percent of original size [2021-07-13 19:54:41,084 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:41,084 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:21 [2021-07-13 19:54:41,152 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:41,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586908785] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:41,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:41,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:54:41,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953124603] [2021-07-13 19:54:41,153 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:54:41,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:41,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:54:41,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:54:41,154 INFO L87 Difference]: Start difference. First operand 1412 states and 4877 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:42,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:42,210 INFO L93 Difference]: Finished difference Result 2222 states and 7429 transitions. [2021-07-13 19:54:42,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-13 19:54:42,211 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:42,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:42,215 INFO L225 Difference]: With dead ends: 2222 [2021-07-13 19:54:42,215 INFO L226 Difference]: Without dead ends: 2190 [2021-07-13 19:54:42,215 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 766.7ms TimeCoverageRelationStatistics Valid=167, Invalid=1165, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:54:42,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2190 states. [2021-07-13 19:54:42,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2190 to 1424. [2021-07-13 19:54:42,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1424 states, 1423 states have (on average 3.456078706957133) internal successors, (4918), 1423 states have internal predecessors, (4918), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:42,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1424 states to 1424 states and 4918 transitions. [2021-07-13 19:54:42,248 INFO L78 Accepts]: Start accepts. Automaton has 1424 states and 4918 transitions. Word has length 24 [2021-07-13 19:54:42,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:42,248 INFO L482 AbstractCegarLoop]: Abstraction has 1424 states and 4918 transitions. [2021-07-13 19:54:42,248 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:42,248 INFO L276 IsEmpty]: Start isEmpty. Operand 1424 states and 4918 transitions. [2021-07-13 19:54:42,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:42,251 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:42,251 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:42,464 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140,85 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:42,465 INFO L430 AbstractCegarLoop]: === Iteration 97 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:42,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:42,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1487913390, now seen corresponding path program 55 times [2021-07-13 19:54:42,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:42,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923008283] [2021-07-13 19:54:42,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:42,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:42,650 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:42,650 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:42,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923008283] [2021-07-13 19:54:42,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923008283] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:42,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375369716] [2021-07-13 19:54:42,650 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:42,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:42,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:42,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:42,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:42,834 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:42,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:42,836 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:42,836 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:54:42,866 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:42,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375369716] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:42,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:42,867 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:42,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097826645] [2021-07-13 19:54:42,867 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:42,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:42,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:42,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:42,868 INFO L87 Difference]: Start difference. First operand 1424 states and 4918 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:44,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:44,030 INFO L93 Difference]: Finished difference Result 2213 states and 7447 transitions. [2021-07-13 19:54:44,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:54:44,030 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:44,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:44,034 INFO L225 Difference]: With dead ends: 2213 [2021-07-13 19:54:44,034 INFO L226 Difference]: Without dead ends: 2191 [2021-07-13 19:54:44,034 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 821.1ms TimeCoverageRelationStatistics Valid=235, Invalid=1487, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:54:44,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2191 states. [2021-07-13 19:54:44,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2191 to 1426. [2021-07-13 19:54:44,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1426 states, 1425 states have (on average 3.4596491228070176) internal successors, (4930), 1425 states have internal predecessors, (4930), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:44,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1426 states to 1426 states and 4930 transitions. [2021-07-13 19:54:44,058 INFO L78 Accepts]: Start accepts. Automaton has 1426 states and 4930 transitions. Word has length 24 [2021-07-13 19:54:44,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:44,058 INFO L482 AbstractCegarLoop]: Abstraction has 1426 states and 4930 transitions. [2021-07-13 19:54:44,058 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:44,058 INFO L276 IsEmpty]: Start isEmpty. Operand 1426 states and 4930 transitions. [2021-07-13 19:54:44,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:44,060 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:44,060 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:44,260 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable144 [2021-07-13 19:54:44,261 INFO L430 AbstractCegarLoop]: === Iteration 98 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:44,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:44,261 INFO L82 PathProgramCache]: Analyzing trace with hash 1311371958, now seen corresponding path program 56 times [2021-07-13 19:54:44,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:44,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733120230] [2021-07-13 19:54:44,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:44,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:44,455 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:44,455 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:44,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733120230] [2021-07-13 19:54:44,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733120230] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:44,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976205894] [2021-07-13 19:54:44,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:44,482 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:54:44,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:44,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:54:44,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:44,619 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:44,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:54:44,620 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:44,630 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:44,631 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:44,631 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:54:44,722 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:44,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976205894] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:44,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:44,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:54:44,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005097896] [2021-07-13 19:54:44,723 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:44,723 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:44,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:44,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:44,723 INFO L87 Difference]: Start difference. First operand 1426 states and 4930 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:45,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:45,830 INFO L93 Difference]: Finished difference Result 2144 states and 7220 transitions. [2021-07-13 19:54:45,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 19:54:45,830 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:45,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:45,834 INFO L225 Difference]: With dead ends: 2144 [2021-07-13 19:54:45,834 INFO L226 Difference]: Without dead ends: 2134 [2021-07-13 19:54:45,834 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 832.6ms TimeCoverageRelationStatistics Valid=251, Invalid=1555, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:54:45,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2134 states. [2021-07-13 19:54:45,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2134 to 1432. [2021-07-13 19:54:45,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1432 states, 1431 states have (on average 3.4556254367575123) internal successors, (4945), 1431 states have internal predecessors, (4945), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:45,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1432 states to 1432 states and 4945 transitions. [2021-07-13 19:54:45,856 INFO L78 Accepts]: Start accepts. Automaton has 1432 states and 4945 transitions. Word has length 24 [2021-07-13 19:54:45,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:45,856 INFO L482 AbstractCegarLoop]: Abstraction has 1432 states and 4945 transitions. [2021-07-13 19:54:45,856 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:45,856 INFO L276 IsEmpty]: Start isEmpty. Operand 1432 states and 4945 transitions. [2021-07-13 19:54:45,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:45,859 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:45,859 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:46,072 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable145 [2021-07-13 19:54:46,072 INFO L430 AbstractCegarLoop]: === Iteration 99 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:46,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:46,073 INFO L82 PathProgramCache]: Analyzing trace with hash 477633518, now seen corresponding path program 57 times [2021-07-13 19:54:46,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:46,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627638030] [2021-07-13 19:54:46,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:46,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:46,252 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:46,252 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:46,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627638030] [2021-07-13 19:54:46,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627638030] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:46,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023106433] [2021-07-13 19:54:46,252 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:46,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-13 19:54:46,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:46,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:46,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:46,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:46,419 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:46,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 23 treesize of output 49 [2021-07-13 19:54:46,422 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:46,438 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:46,439 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:46,439 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:46 [2021-07-13 19:54:46,659 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:46,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023106433] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:46,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:46,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:54:46,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973410351] [2021-07-13 19:54:46,660 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:54:46,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:46,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:54:46,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:54:46,660 INFO L87 Difference]: Start difference. First operand 1432 states and 4945 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:48,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:48,364 INFO L93 Difference]: Finished difference Result 2174 states and 7260 transitions. [2021-07-13 19:54:48,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-07-13 19:54:48,364 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:48,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:48,369 INFO L225 Difference]: With dead ends: 2174 [2021-07-13 19:54:48,369 INFO L226 Difference]: Without dead ends: 2163 [2021-07-13 19:54:48,369 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 673 ImplicationChecksByTransitivity, 1488.6ms TimeCoverageRelationStatistics Valid=384, Invalid=2268, Unknown=0, NotChecked=0, Total=2652 [2021-07-13 19:54:48,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2163 states. [2021-07-13 19:54:48,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2163 to 1456. [2021-07-13 19:54:48,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1456 states, 1455 states have (on average 3.454982817869416) internal successors, (5027), 1455 states have internal predecessors, (5027), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:48,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1456 states to 1456 states and 5027 transitions. [2021-07-13 19:54:48,402 INFO L78 Accepts]: Start accepts. Automaton has 1456 states and 5027 transitions. Word has length 24 [2021-07-13 19:54:48,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:48,402 INFO L482 AbstractCegarLoop]: Abstraction has 1456 states and 5027 transitions. [2021-07-13 19:54:48,402 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:48,403 INFO L276 IsEmpty]: Start isEmpty. Operand 1456 states and 5027 transitions. [2021-07-13 19:54:48,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:48,406 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:48,406 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:48,625 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable147 [2021-07-13 19:54:48,626 INFO L430 AbstractCegarLoop]: === Iteration 100 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:48,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:48,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1259467318, now seen corresponding path program 58 times [2021-07-13 19:54:48,626 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:48,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185685003] [2021-07-13 19:54:48,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:48,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:48,811 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:48,811 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:48,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185685003] [2021-07-13 19:54:48,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185685003] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:48,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464112288] [2021-07-13 19:54:48,811 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:48,838 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:54:48,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:48,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:48,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:48,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:54:48,963 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:48,967 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:48,968 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:48,968 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:54:49,030 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:49,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464112288] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:49,030 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:49,030 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:54:49,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250622166] [2021-07-13 19:54:49,031 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:54:49,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:49,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:54:49,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:54:49,031 INFO L87 Difference]: Start difference. First operand 1456 states and 5027 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:49,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:49,898 INFO L93 Difference]: Finished difference Result 2091 states and 7062 transitions. [2021-07-13 19:54:49,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:54:49,898 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:49,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:49,902 INFO L225 Difference]: With dead ends: 2091 [2021-07-13 19:54:49,902 INFO L226 Difference]: Without dead ends: 2080 [2021-07-13 19:54:49,902 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 678.6ms TimeCoverageRelationStatistics Valid=149, Invalid=907, Unknown=0, NotChecked=0, Total=1056 [2021-07-13 19:54:49,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2080 states. [2021-07-13 19:54:49,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2080 to 1453. [2021-07-13 19:54:49,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1453 states, 1452 states have (on average 3.4579889807162534) internal successors, (5021), 1452 states have internal predecessors, (5021), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:49,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1453 states to 1453 states and 5021 transitions. [2021-07-13 19:54:49,926 INFO L78 Accepts]: Start accepts. Automaton has 1453 states and 5021 transitions. Word has length 24 [2021-07-13 19:54:49,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:49,926 INFO L482 AbstractCegarLoop]: Abstraction has 1453 states and 5021 transitions. [2021-07-13 19:54:49,926 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:49,926 INFO L276 IsEmpty]: Start isEmpty. Operand 1453 states and 5021 transitions. [2021-07-13 19:54:49,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:49,928 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:49,928 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:50,128 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152,89 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:50,128 INFO L430 AbstractCegarLoop]: === Iteration 101 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:50,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:50,129 INFO L82 PathProgramCache]: Analyzing trace with hash -291281526, now seen corresponding path program 8 times [2021-07-13 19:54:50,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:50,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256147713] [2021-07-13 19:54:50,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:50,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:50,304 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:50,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:50,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256147713] [2021-07-13 19:54:50,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256147713] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:50,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581786477] [2021-07-13 19:54:50,305 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:50,333 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:54:50,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:50,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:54:50,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:50,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:50,571 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:54:50,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:50,573 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:50,578 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:50,579 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:50,579 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:54:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:50,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581786477] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:50,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:50,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:54:50,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366068581] [2021-07-13 19:54:50,623 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:54:50,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:50,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:54:50,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:54:50,624 INFO L87 Difference]: Start difference. First operand 1453 states and 5021 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:51,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:51,855 INFO L93 Difference]: Finished difference Result 2199 states and 7401 transitions. [2021-07-13 19:54:51,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 19:54:51,856 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:51,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:51,859 INFO L225 Difference]: With dead ends: 2199 [2021-07-13 19:54:51,860 INFO L226 Difference]: Without dead ends: 2190 [2021-07-13 19:54:51,860 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 792.2ms TimeCoverageRelationStatistics Valid=206, Invalid=1434, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 19:54:51,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2190 states. [2021-07-13 19:54:51,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2190 to 1453. [2021-07-13 19:54:51,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1453 states, 1452 states have (on average 3.4579889807162534) internal successors, (5021), 1452 states have internal predecessors, (5021), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:51,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1453 states to 1453 states and 5021 transitions. [2021-07-13 19:54:51,885 INFO L78 Accepts]: Start accepts. Automaton has 1453 states and 5021 transitions. Word has length 24 [2021-07-13 19:54:51,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:51,885 INFO L482 AbstractCegarLoop]: Abstraction has 1453 states and 5021 transitions. [2021-07-13 19:54:51,885 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:51,885 INFO L276 IsEmpty]: Start isEmpty. Operand 1453 states and 5021 transitions. [2021-07-13 19:54:51,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:51,887 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:51,887 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:52,088 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,90 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:52,088 INFO L430 AbstractCegarLoop]: === Iteration 102 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:52,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:52,088 INFO L82 PathProgramCache]: Analyzing trace with hash -500818906, now seen corresponding path program 9 times [2021-07-13 19:54:52,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:52,088 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136535865] [2021-07-13 19:54:52,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:52,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:52,322 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:52,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:52,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136535865] [2021-07-13 19:54:52,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136535865] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:52,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902648969] [2021-07-13 19:54:52,324 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:52,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:54:52,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:52,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:52,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:52,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:52,555 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:52,557 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:52,557 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:52,557 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:54:52,593 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:52,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902648969] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:52,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:52,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:52,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984930919] [2021-07-13 19:54:52,594 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:52,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:52,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:52,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:52,594 INFO L87 Difference]: Start difference. First operand 1453 states and 5021 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:53,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:53,870 INFO L93 Difference]: Finished difference Result 2243 states and 7546 transitions. [2021-07-13 19:54:53,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 19:54:53,870 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:53,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:53,874 INFO L225 Difference]: With dead ends: 2243 [2021-07-13 19:54:53,874 INFO L226 Difference]: Without dead ends: 2224 [2021-07-13 19:54:53,875 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 947.5ms TimeCoverageRelationStatistics Valid=241, Invalid=1565, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:54:53,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2224 states. [2021-07-13 19:54:53,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2224 to 1462. [2021-07-13 19:54:53,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1462 states, 1461 states have (on average 3.45927446954141) internal successors, (5054), 1461 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:53,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1462 states to 1462 states and 5054 transitions. [2021-07-13 19:54:53,896 INFO L78 Accepts]: Start accepts. Automaton has 1462 states and 5054 transitions. Word has length 24 [2021-07-13 19:54:53,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:53,896 INFO L482 AbstractCegarLoop]: Abstraction has 1462 states and 5054 transitions. [2021-07-13 19:54:53,896 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:53,896 INFO L276 IsEmpty]: Start isEmpty. Operand 1462 states and 5054 transitions. [2021-07-13 19:54:53,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:53,898 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:53,898 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:54,099 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154,91 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:54,099 INFO L430 AbstractCegarLoop]: === Iteration 103 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:54,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:54,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1227852840, now seen corresponding path program 10 times [2021-07-13 19:54:54,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:54,100 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282428795] [2021-07-13 19:54:54,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:54,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:54,314 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:54,314 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:54,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282428795] [2021-07-13 19:54:54,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282428795] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:54,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499577746] [2021-07-13 19:54:54,315 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:54,341 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:54:54,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:54,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:54,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:54,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:54:54,511 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:54,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:54,513 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:54,513 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 19:54:54,546 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:54,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499577746] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:54,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:54,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:54:54,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094517659] [2021-07-13 19:54:54,547 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:54:54,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:54,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:54:54,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:54:54,547 INFO L87 Difference]: Start difference. First operand 1462 states and 5054 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:55,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:55,734 INFO L93 Difference]: Finished difference Result 2195 states and 7404 transitions. [2021-07-13 19:54:55,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:54:55,734 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:55,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:55,738 INFO L225 Difference]: With dead ends: 2195 [2021-07-13 19:54:55,738 INFO L226 Difference]: Without dead ends: 2176 [2021-07-13 19:54:55,738 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 843.3ms TimeCoverageRelationStatistics Valid=235, Invalid=1487, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:54:55,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2176 states. [2021-07-13 19:54:55,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2176 to 1460. [2021-07-13 19:54:55,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1460 states, 1459 states have (on average 3.4619602467443453) internal successors, (5051), 1459 states have internal predecessors, (5051), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:55,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1460 states to 1460 states and 5051 transitions. [2021-07-13 19:54:55,760 INFO L78 Accepts]: Start accepts. Automaton has 1460 states and 5051 transitions. Word has length 24 [2021-07-13 19:54:55,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:55,760 INFO L482 AbstractCegarLoop]: Abstraction has 1460 states and 5051 transitions. [2021-07-13 19:54:55,760 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:55,760 INFO L276 IsEmpty]: Start isEmpty. Operand 1460 states and 5051 transitions. [2021-07-13 19:54:55,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:55,762 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:55,762 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:55,962 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable155 [2021-07-13 19:54:55,962 INFO L430 AbstractCegarLoop]: === Iteration 104 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:55,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:55,964 INFO L82 PathProgramCache]: Analyzing trace with hash 199702980, now seen corresponding path program 11 times [2021-07-13 19:54:55,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:55,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432978726] [2021-07-13 19:54:55,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:55,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:56,139 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:56,139 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:56,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432978726] [2021-07-13 19:54:56,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432978726] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:56,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637986945] [2021-07-13 19:54:56,139 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:56,180 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:54:56,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:56,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:56,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:56,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:54:56,321 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:56,324 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:56,324 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:56,324 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:54:56,372 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:56,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637986945] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:56,372 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:56,372 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:54:56,372 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739840791] [2021-07-13 19:54:56,372 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:54:56,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:56,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:54:56,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:54:56,373 INFO L87 Difference]: Start difference. First operand 1460 states and 5051 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:57,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:57,239 INFO L93 Difference]: Finished difference Result 2165 states and 7322 transitions. [2021-07-13 19:54:57,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:54:57,240 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:57,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:57,243 INFO L225 Difference]: With dead ends: 2165 [2021-07-13 19:54:57,243 INFO L226 Difference]: Without dead ends: 2156 [2021-07-13 19:54:57,243 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 637.7ms TimeCoverageRelationStatistics Valid=199, Invalid=1133, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:54:57,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2156 states. [2021-07-13 19:54:57,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2156 to 1469. [2021-07-13 19:54:57,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1469 states, 1468 states have (on average 3.459809264305177) internal successors, (5079), 1468 states have internal predecessors, (5079), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:57,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1469 states to 1469 states and 5079 transitions. [2021-07-13 19:54:57,265 INFO L78 Accepts]: Start accepts. Automaton has 1469 states and 5079 transitions. Word has length 24 [2021-07-13 19:54:57,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:57,265 INFO L482 AbstractCegarLoop]: Abstraction has 1469 states and 5079 transitions. [2021-07-13 19:54:57,265 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:57,265 INFO L276 IsEmpty]: Start isEmpty. Operand 1469 states and 5079 transitions. [2021-07-13 19:54:57,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:57,267 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:57,267 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:57,468 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 93 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable156 [2021-07-13 19:54:57,468 INFO L430 AbstractCegarLoop]: === Iteration 105 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:57,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:57,468 INFO L82 PathProgramCache]: Analyzing trace with hash 523289158, now seen corresponding path program 12 times [2021-07-13 19:54:57,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:57,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188822876] [2021-07-13 19:54:57,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:57,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:57,631 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:57,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:57,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188822876] [2021-07-13 19:54:57,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188822876] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:57,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603034422] [2021-07-13 19:54:57,631 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:57,659 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:54:57,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:54:57,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 29 conjunts are in the unsatisfiable core [2021-07-13 19:54:57,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:57,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:57,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:57,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:54:57,826 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:57,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 43 [2021-07-13 19:54:57,828 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:57,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:57,855 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:57,855 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:88 [2021-07-13 19:54:57,981 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:57,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603034422] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:57,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:57,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:54:57,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817279945] [2021-07-13 19:54:57,981 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:54:57,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:57,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:54:57,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=474, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:54:57,982 INFO L87 Difference]: Start difference. First operand 1469 states and 5079 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:59,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:54:59,116 INFO L93 Difference]: Finished difference Result 2142 states and 7233 transitions. [2021-07-13 19:54:59,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 19:54:59,116 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:54:59,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:54:59,120 INFO L225 Difference]: With dead ends: 2142 [2021-07-13 19:54:59,120 INFO L226 Difference]: Without dead ends: 2133 [2021-07-13 19:54:59,120 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 915.8ms TimeCoverageRelationStatistics Valid=284, Invalid=1522, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:54:59,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2133 states. [2021-07-13 19:54:59,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2133 to 1481. [2021-07-13 19:54:59,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1481 states, 1480 states have (on average 3.4594594594594597) internal successors, (5120), 1480 states have internal predecessors, (5120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:59,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1481 states to 1481 states and 5120 transitions. [2021-07-13 19:54:59,141 INFO L78 Accepts]: Start accepts. Automaton has 1481 states and 5120 transitions. Word has length 24 [2021-07-13 19:54:59,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:54:59,141 INFO L482 AbstractCegarLoop]: Abstraction has 1481 states and 5120 transitions. [2021-07-13 19:54:59,141 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:54:59,141 INFO L276 IsEmpty]: Start isEmpty. Operand 1481 states and 5120 transitions. [2021-07-13 19:54:59,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:54:59,143 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:54:59,143 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:54:59,344 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable157 [2021-07-13 19:54:59,344 INFO L430 AbstractCegarLoop]: === Iteration 106 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:54:59,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:54:59,344 INFO L82 PathProgramCache]: Analyzing trace with hash -2085934016, now seen corresponding path program 13 times [2021-07-13 19:54:59,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:54:59,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240721801] [2021-07-13 19:54:59,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:54:59,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:59,506 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:59,506 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:54:59,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240721801] [2021-07-13 19:54:59,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240721801] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:59,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876632425] [2021-07-13 19:54:59,506 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:54:59,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:54:59,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:54:59,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:54:59,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:54:59,660 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:54:59,662 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:54:59,663 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:54:59,663 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:54:59,708 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:54:59,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876632425] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:54:59,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:54:59,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:54:59,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494838937] [2021-07-13 19:54:59,709 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:54:59,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:54:59,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:54:59,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:54:59,709 INFO L87 Difference]: Start difference. First operand 1481 states and 5120 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:00,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:00,514 INFO L93 Difference]: Finished difference Result 2094 states and 7096 transitions. [2021-07-13 19:55:00,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-13 19:55:00,514 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:00,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:00,519 INFO L225 Difference]: With dead ends: 2094 [2021-07-13 19:55:00,519 INFO L226 Difference]: Without dead ends: 2083 [2021-07-13 19:55:00,519 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 580.2ms TimeCoverageRelationStatistics Valid=149, Invalid=907, Unknown=0, NotChecked=0, Total=1056 [2021-07-13 19:55:00,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-07-13 19:55:00,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 1473. [2021-07-13 19:55:00,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1473 states, 1472 states have (on average 3.4619565217391304) internal successors, (5096), 1472 states have internal predecessors, (5096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:00,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1473 states to 1473 states and 5096 transitions. [2021-07-13 19:55:00,551 INFO L78 Accepts]: Start accepts. Automaton has 1473 states and 5096 transitions. Word has length 24 [2021-07-13 19:55:00,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:00,551 INFO L482 AbstractCegarLoop]: Abstraction has 1473 states and 5096 transitions. [2021-07-13 19:55:00,552 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:00,552 INFO L276 IsEmpty]: Start isEmpty. Operand 1473 states and 5096 transitions. [2021-07-13 19:55:00,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:00,555 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:00,555 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:00,772 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable163,95 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:00,773 INFO L430 AbstractCegarLoop]: === Iteration 107 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:00,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:00,773 INFO L82 PathProgramCache]: Analyzing trace with hash 721304348, now seen corresponding path program 59 times [2021-07-13 19:55:00,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:00,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842887414] [2021-07-13 19:55:00,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:00,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:00,964 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:00,965 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:00,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842887414] [2021-07-13 19:55:00,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842887414] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:00,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540564642] [2021-07-13 19:55:00,965 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:00,991 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:55:00,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:00,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:00,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:01,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:55:01,164 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:01,166 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:01,166 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:01,167 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:55:01,206 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:01,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540564642] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:01,206 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:01,206 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:55:01,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805518424] [2021-07-13 19:55:01,207 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:55:01,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:01,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:55:01,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:55:01,207 INFO L87 Difference]: Start difference. First operand 1473 states and 5096 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:03,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:03,320 INFO L93 Difference]: Finished difference Result 2359 states and 7859 transitions. [2021-07-13 19:55:03,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-07-13 19:55:03,320 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:03,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:03,325 INFO L225 Difference]: With dead ends: 2359 [2021-07-13 19:55:03,325 INFO L226 Difference]: Without dead ends: 2317 [2021-07-13 19:55:03,325 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1658.9ms TimeCoverageRelationStatistics Valid=405, Invalid=2675, Unknown=0, NotChecked=0, Total=3080 [2021-07-13 19:55:03,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2317 states. [2021-07-13 19:55:03,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2317 to 1490. [2021-07-13 19:55:03,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1490 states, 1489 states have (on average 3.455339153794493) internal successors, (5145), 1489 states have internal predecessors, (5145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:03,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1490 states to 1490 states and 5145 transitions. [2021-07-13 19:55:03,347 INFO L78 Accepts]: Start accepts. Automaton has 1490 states and 5145 transitions. Word has length 24 [2021-07-13 19:55:03,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:03,347 INFO L482 AbstractCegarLoop]: Abstraction has 1490 states and 5145 transitions. [2021-07-13 19:55:03,347 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:03,348 INFO L276 IsEmpty]: Start isEmpty. Operand 1490 states and 5145 transitions. [2021-07-13 19:55:03,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:03,349 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:03,350 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:03,550 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164,96 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:03,550 INFO L430 AbstractCegarLoop]: === Iteration 108 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:03,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:03,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1985601830, now seen corresponding path program 60 times [2021-07-13 19:55:03,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:03,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786236006] [2021-07-13 19:55:03,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:03,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:03,773 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:03,773 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:03,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786236006] [2021-07-13 19:55:03,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [786236006] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:03,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140098135] [2021-07-13 19:55:03,773 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:03,807 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:55:03,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:03,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:03,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:04,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:55:04,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:55:04,084 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:04,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 40 [2021-07-13 19:55:04,089 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:55:04,119 INFO L628 ElimStorePlain]: treesize reduction 31, result has 44.6 percent of original size [2021-07-13 19:55:04,122 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:04,123 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:19 [2021-07-13 19:55:04,213 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:04,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140098135] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:04,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:04,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:55:04,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254176111] [2021-07-13 19:55:04,214 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:55:04,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:04,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:55:04,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:55:04,215 INFO L87 Difference]: Start difference. First operand 1490 states and 5145 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:05,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:05,890 INFO L93 Difference]: Finished difference Result 2233 states and 7485 transitions. [2021-07-13 19:55:05,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 19:55:05,890 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:05,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:05,894 INFO L225 Difference]: With dead ends: 2233 [2021-07-13 19:55:05,894 INFO L226 Difference]: Without dead ends: 2187 [2021-07-13 19:55:05,895 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 1242.2ms TimeCoverageRelationStatistics Valid=237, Invalid=1743, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 19:55:05,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2187 states. [2021-07-13 19:55:05,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2187 to 1495. [2021-07-13 19:55:05,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1495 states, 1494 states have (on average 3.4558232931726907) internal successors, (5163), 1494 states have internal predecessors, (5163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:05,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1495 states to 1495 states and 5163 transitions. [2021-07-13 19:55:05,916 INFO L78 Accepts]: Start accepts. Automaton has 1495 states and 5163 transitions. Word has length 24 [2021-07-13 19:55:05,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:05,916 INFO L482 AbstractCegarLoop]: Abstraction has 1495 states and 5163 transitions. [2021-07-13 19:55:05,916 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:05,916 INFO L276 IsEmpty]: Start isEmpty. Operand 1495 states and 5163 transitions. [2021-07-13 19:55:05,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:05,918 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:05,918 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:06,118 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable165 [2021-07-13 19:55:06,119 INFO L430 AbstractCegarLoop]: === Iteration 109 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:06,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:06,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1809060398, now seen corresponding path program 61 times [2021-07-13 19:55:06,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:06,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748579446] [2021-07-13 19:55:06,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:06,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:06,301 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:06,301 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:06,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748579446] [2021-07-13 19:55:06,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748579446] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:06,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72878056] [2021-07-13 19:55:06,301 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:06,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:06,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:06,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:06,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:06,478 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:06,481 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:06,482 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:06,482 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:06,545 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:06,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72878056] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:06,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:06,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:55:06,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045614454] [2021-07-13 19:55:06,546 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:55:06,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:06,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:55:06,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:55:06,547 INFO L87 Difference]: Start difference. First operand 1495 states and 5163 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:07,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:07,929 INFO L93 Difference]: Finished difference Result 2155 states and 7270 transitions. [2021-07-13 19:55:07,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-07-13 19:55:07,929 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:07,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:07,933 INFO L225 Difference]: With dead ends: 2155 [2021-07-13 19:55:07,933 INFO L226 Difference]: Without dead ends: 2125 [2021-07-13 19:55:07,933 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 1137.2ms TimeCoverageRelationStatistics Valid=336, Invalid=1920, Unknown=0, NotChecked=0, Total=2256 [2021-07-13 19:55:07,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2125 states. [2021-07-13 19:55:07,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2125 to 1497. [2021-07-13 19:55:07,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1497 states, 1496 states have (on average 3.4558823529411766) internal successors, (5170), 1496 states have internal predecessors, (5170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:07,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1497 states to 1497 states and 5170 transitions. [2021-07-13 19:55:07,953 INFO L78 Accepts]: Start accepts. Automaton has 1497 states and 5170 transitions. Word has length 24 [2021-07-13 19:55:07,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:07,953 INFO L482 AbstractCegarLoop]: Abstraction has 1497 states and 5170 transitions. [2021-07-13 19:55:07,953 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:07,954 INFO L276 IsEmpty]: Start isEmpty. Operand 1497 states and 5170 transitions. [2021-07-13 19:55:07,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:07,956 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:07,956 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:08,156 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable169 [2021-07-13 19:55:08,156 INFO L430 AbstractCegarLoop]: === Iteration 110 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:08,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:08,157 INFO L82 PathProgramCache]: Analyzing trace with hash 975321958, now seen corresponding path program 62 times [2021-07-13 19:55:08,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:08,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993344625] [2021-07-13 19:55:08,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:08,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:08,333 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:08,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:08,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993344625] [2021-07-13 19:55:08,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993344625] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:08,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780626911] [2021-07-13 19:55:08,334 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:08,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:55:08,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:08,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:55:08,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:08,500 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:08,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:55:08,501 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:08,511 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:08,512 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:08,512 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:55:08,623 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:08,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780626911] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:08,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:08,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:55:08,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192657283] [2021-07-13 19:55:08,623 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:55:08,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:08,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:55:08,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:55:08,624 INFO L87 Difference]: Start difference. First operand 1497 states and 5170 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:10,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:10,026 INFO L93 Difference]: Finished difference Result 2128 states and 7174 transitions. [2021-07-13 19:55:10,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-07-13 19:55:10,027 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:10,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:10,030 INFO L225 Difference]: With dead ends: 2128 [2021-07-13 19:55:10,030 INFO L226 Difference]: Without dead ends: 2097 [2021-07-13 19:55:10,031 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 1158.9ms TimeCoverageRelationStatistics Valid=297, Invalid=2055, Unknown=0, NotChecked=0, Total=2352 [2021-07-13 19:55:10,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2097 states. [2021-07-13 19:55:10,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2097 to 1499. [2021-07-13 19:55:10,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1499 states, 1498 states have (on average 3.4539385847797064) internal successors, (5174), 1498 states have internal predecessors, (5174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:10,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1499 states to 1499 states and 5174 transitions. [2021-07-13 19:55:10,050 INFO L78 Accepts]: Start accepts. Automaton has 1499 states and 5174 transitions. Word has length 24 [2021-07-13 19:55:10,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:10,050 INFO L482 AbstractCegarLoop]: Abstraction has 1499 states and 5174 transitions. [2021-07-13 19:55:10,050 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:10,050 INFO L276 IsEmpty]: Start isEmpty. Operand 1499 states and 5174 transitions. [2021-07-13 19:55:10,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:10,052 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:10,052 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:10,261 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170,99 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:10,261 INFO L430 AbstractCegarLoop]: === Iteration 111 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:10,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:10,262 INFO L82 PathProgramCache]: Analyzing trace with hash -846298030, now seen corresponding path program 14 times [2021-07-13 19:55:10,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:10,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091859264] [2021-07-13 19:55:10,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:10,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:10,465 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:10,466 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:10,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091859264] [2021-07-13 19:55:10,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091859264] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:10,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788727864] [2021-07-13 19:55:10,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:10,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:55:10,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:10,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:55:10,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:10,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:55:10,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:55:10,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:55:10,721 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:10,726 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:10,727 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:10,728 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:55:10,772 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:10,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788727864] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:10,772 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:10,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:55:10,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341219396] [2021-07-13 19:55:10,773 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:55:10,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:10,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:55:10,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:55:10,773 INFO L87 Difference]: Start difference. First operand 1499 states and 5174 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:12,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:12,398 INFO L93 Difference]: Finished difference Result 2335 states and 7758 transitions. [2021-07-13 19:55:12,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 19:55:12,399 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:12,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:12,403 INFO L225 Difference]: With dead ends: 2335 [2021-07-13 19:55:12,403 INFO L226 Difference]: Without dead ends: 2285 [2021-07-13 19:55:12,403 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 762 ImplicationChecksByTransitivity, 1345.5ms TimeCoverageRelationStatistics Valid=381, Invalid=2589, Unknown=0, NotChecked=0, Total=2970 [2021-07-13 19:55:12,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2285 states. [2021-07-13 19:55:12,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2285 to 1503. [2021-07-13 19:55:12,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1503 states, 1502 states have (on average 3.454727030625832) internal successors, (5189), 1502 states have internal predecessors, (5189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:12,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1503 states to 1503 states and 5189 transitions. [2021-07-13 19:55:12,424 INFO L78 Accepts]: Start accepts. Automaton has 1503 states and 5189 transitions. Word has length 24 [2021-07-13 19:55:12,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:12,424 INFO L482 AbstractCegarLoop]: Abstraction has 1503 states and 5189 transitions. [2021-07-13 19:55:12,424 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:12,424 INFO L276 IsEmpty]: Start isEmpty. Operand 1503 states and 5189 transitions. [2021-07-13 19:55:12,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:12,426 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:12,426 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:12,627 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable172 [2021-07-13 19:55:12,627 INFO L430 AbstractCegarLoop]: === Iteration 112 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:12,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:12,627 INFO L82 PathProgramCache]: Analyzing trace with hash 882373716, now seen corresponding path program 15 times [2021-07-13 19:55:12,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:12,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002484112] [2021-07-13 19:55:12,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:12,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:12,838 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:12,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:12,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002484112] [2021-07-13 19:55:12,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002484112] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:12,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922353063] [2021-07-13 19:55:12,838 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:12,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:55:12,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:12,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:55:12,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:13,038 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:13,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:55:13,040 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:13,049 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:13,049 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:13,050 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 19:55:13,119 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:13,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922353063] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:13,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:13,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:55:13,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402742092] [2021-07-13 19:55:13,119 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:55:13,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:13,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:55:13,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:55:13,120 INFO L87 Difference]: Start difference. First operand 1503 states and 5189 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:13,400 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 57 [2021-07-13 19:55:15,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:15,771 INFO L93 Difference]: Finished difference Result 2316 states and 7730 transitions. [2021-07-13 19:55:15,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-07-13 19:55:15,771 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:15,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:15,775 INFO L225 Difference]: With dead ends: 2316 [2021-07-13 19:55:15,775 INFO L226 Difference]: Without dead ends: 2277 [2021-07-13 19:55:15,776 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1198 ImplicationChecksByTransitivity, 2272.0ms TimeCoverageRelationStatistics Valid=572, Invalid=3588, Unknown=0, NotChecked=0, Total=4160 [2021-07-13 19:55:15,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2277 states. [2021-07-13 19:55:15,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2277 to 1507. [2021-07-13 19:55:15,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1507 states, 1506 states have (on average 3.455511288180611) internal successors, (5204), 1506 states have internal predecessors, (5204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:15,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1507 states to 1507 states and 5204 transitions. [2021-07-13 19:55:15,797 INFO L78 Accepts]: Start accepts. Automaton has 1507 states and 5204 transitions. Word has length 24 [2021-07-13 19:55:15,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:15,798 INFO L482 AbstractCegarLoop]: Abstraction has 1507 states and 5204 transitions. [2021-07-13 19:55:15,798 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:15,798 INFO L276 IsEmpty]: Start isEmpty. Operand 1507 states and 5204 transitions. [2021-07-13 19:55:15,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:15,799 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:15,800 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:16,000 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173,101 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:16,000 INFO L430 AbstractCegarLoop]: === Iteration 113 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:16,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:16,000 INFO L82 PathProgramCache]: Analyzing trace with hash -145776144, now seen corresponding path program 16 times [2021-07-13 19:55:16,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:16,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686518980] [2021-07-13 19:55:16,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:16,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:16,183 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:16,183 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:16,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686518980] [2021-07-13 19:55:16,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [686518980] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:16,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365741017] [2021-07-13 19:55:16,184 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:16,211 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:55:16,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:16,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:16,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:16,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:16,346 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:16,349 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:16,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:16,350 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:16,397 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:16,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365741017] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:16,397 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:16,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:55:16,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105218578] [2021-07-13 19:55:16,398 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:55:16,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:16,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:55:16,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:55:16,398 INFO L87 Difference]: Start difference. First operand 1507 states and 5204 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:17,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:17,737 INFO L93 Difference]: Finished difference Result 2152 states and 7265 transitions. [2021-07-13 19:55:17,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-07-13 19:55:17,738 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:17,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:17,741 INFO L225 Difference]: With dead ends: 2152 [2021-07-13 19:55:17,741 INFO L226 Difference]: Without dead ends: 2126 [2021-07-13 19:55:17,742 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 1086.2ms TimeCoverageRelationStatistics Valid=350, Invalid=2002, Unknown=0, NotChecked=0, Total=2352 [2021-07-13 19:55:17,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2126 states. [2021-07-13 19:55:17,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2126 to 1510. [2021-07-13 19:55:17,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1510 states, 1509 states have (on average 3.453943008614977) internal successors, (5212), 1509 states have internal predecessors, (5212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:17,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1510 states to 1510 states and 5212 transitions. [2021-07-13 19:55:17,763 INFO L78 Accepts]: Start accepts. Automaton has 1510 states and 5212 transitions. Word has length 24 [2021-07-13 19:55:17,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:17,763 INFO L482 AbstractCegarLoop]: Abstraction has 1510 states and 5212 transitions. [2021-07-13 19:55:17,763 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:17,763 INFO L276 IsEmpty]: Start isEmpty. Operand 1510 states and 5212 transitions. [2021-07-13 19:55:17,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:17,765 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:17,765 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:17,967 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176,102 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:17,967 INFO L430 AbstractCegarLoop]: === Iteration 114 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:17,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:17,967 INFO L82 PathProgramCache]: Analyzing trace with hash 177810034, now seen corresponding path program 17 times [2021-07-13 19:55:17,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:17,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603358285] [2021-07-13 19:55:17,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:17,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:18,147 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:18,147 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:18,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603358285] [2021-07-13 19:55:18,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603358285] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:18,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251458988] [2021-07-13 19:55:18,147 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:18,177 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:55:18,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:18,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:18,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:18,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:18,305 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:18,308 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:18,308 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:18,308 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:18,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:18,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251458988] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:18,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:18,359 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:55:18,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922074858] [2021-07-13 19:55:18,359 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:55:18,359 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:18,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:55:18,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:55:18,360 INFO L87 Difference]: Start difference. First operand 1510 states and 5212 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:19,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:19,500 INFO L93 Difference]: Finished difference Result 2129 states and 7196 transitions. [2021-07-13 19:55:19,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 19:55:19,500 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:19,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:19,504 INFO L225 Difference]: With dead ends: 2129 [2021-07-13 19:55:19,504 INFO L226 Difference]: Without dead ends: 2104 [2021-07-13 19:55:19,504 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 905.6ms TimeCoverageRelationStatistics Valid=255, Invalid=1551, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:55:19,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2104 states. [2021-07-13 19:55:19,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2104 to 1507. [2021-07-13 19:55:19,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1507 states, 1506 states have (on average 3.454183266932271) internal successors, (5202), 1506 states have internal predecessors, (5202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:19,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1507 states to 1507 states and 5202 transitions. [2021-07-13 19:55:19,527 INFO L78 Accepts]: Start accepts. Automaton has 1507 states and 5202 transitions. Word has length 24 [2021-07-13 19:55:19,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:19,527 INFO L482 AbstractCegarLoop]: Abstraction has 1507 states and 5202 transitions. [2021-07-13 19:55:19,527 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:19,527 INFO L276 IsEmpty]: Start isEmpty. Operand 1507 states and 5202 transitions. [2021-07-13 19:55:19,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:19,529 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:19,529 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:19,730 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable177,103 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:19,730 INFO L430 AbstractCegarLoop]: === Iteration 115 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:19,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:19,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1468982144, now seen corresponding path program 63 times [2021-07-13 19:55:19,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:19,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364702091] [2021-07-13 19:55:19,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:19,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:19,962 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:19,962 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:19,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364702091] [2021-07-13 19:55:19,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364702091] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:19,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105738328] [2021-07-13 19:55:19,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:19,997 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:55:19,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:19,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:19,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:20,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:55:20,191 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:20,193 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:20,193 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:20,193 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:55:20,231 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:20,232 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105738328] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:20,232 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:20,232 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:55:20,232 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795079411] [2021-07-13 19:55:20,232 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:55:20,232 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:20,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:55:20,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:55:20,233 INFO L87 Difference]: Start difference. First operand 1507 states and 5202 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:22,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:22,835 INFO L93 Difference]: Finished difference Result 2395 states and 7988 transitions. [2021-07-13 19:55:22,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-07-13 19:55:22,835 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:22,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:22,839 INFO L225 Difference]: With dead ends: 2395 [2021-07-13 19:55:22,839 INFO L226 Difference]: Without dead ends: 2353 [2021-07-13 19:55:22,840 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1425 ImplicationChecksByTransitivity, 2100.2ms TimeCoverageRelationStatistics Valid=583, Invalid=3973, Unknown=0, NotChecked=0, Total=4556 [2021-07-13 19:55:22,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2353 states. [2021-07-13 19:55:22,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2353 to 1512. [2021-07-13 19:55:22,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1512 states, 1511 states have (on average 3.452680344142952) internal successors, (5217), 1511 states have internal predecessors, (5217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:22,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 5217 transitions. [2021-07-13 19:55:22,863 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 5217 transitions. Word has length 24 [2021-07-13 19:55:22,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:22,863 INFO L482 AbstractCegarLoop]: Abstraction has 1512 states and 5217 transitions. [2021-07-13 19:55:22,863 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:22,863 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 5217 transitions. [2021-07-13 19:55:22,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:22,865 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:22,865 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:23,065 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable178 [2021-07-13 19:55:23,066 INFO L430 AbstractCegarLoop]: === Iteration 116 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:23,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:23,066 INFO L82 PathProgramCache]: Analyzing trace with hash 1686407030, now seen corresponding path program 64 times [2021-07-13 19:55:23,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:23,066 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022932050] [2021-07-13 19:55:23,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:23,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:23,234 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:23,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:23,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022932050] [2021-07-13 19:55:23,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022932050] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:23,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388227014] [2021-07-13 19:55:23,234 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:23,262 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:55:23,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:23,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:23,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:23,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:23,392 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:23,395 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:23,395 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:23,396 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:23,443 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:23,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388227014] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:23,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:23,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:55:23,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966941133] [2021-07-13 19:55:23,443 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:55:23,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:23,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:55:23,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:55:23,444 INFO L87 Difference]: Start difference. First operand 1512 states and 5217 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:25,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:25,197 INFO L93 Difference]: Finished difference Result 2231 states and 7499 transitions. [2021-07-13 19:55:25,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-07-13 19:55:25,197 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:25,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:25,201 INFO L225 Difference]: With dead ends: 2231 [2021-07-13 19:55:25,201 INFO L226 Difference]: Without dead ends: 2201 [2021-07-13 19:55:25,201 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 1513.3ms TimeCoverageRelationStatistics Valid=477, Invalid=2829, Unknown=0, NotChecked=0, Total=3306 [2021-07-13 19:55:25,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2201 states. [2021-07-13 19:55:25,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2201 to 1514. [2021-07-13 19:55:25,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1514 states, 1513 states have (on average 3.4527428949107732) internal successors, (5224), 1513 states have internal predecessors, (5224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:25,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1514 states to 1514 states and 5224 transitions. [2021-07-13 19:55:25,222 INFO L78 Accepts]: Start accepts. Automaton has 1514 states and 5224 transitions. Word has length 24 [2021-07-13 19:55:25,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:25,222 INFO L482 AbstractCegarLoop]: Abstraction has 1514 states and 5224 transitions. [2021-07-13 19:55:25,222 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:25,222 INFO L276 IsEmpty]: Start isEmpty. Operand 1514 states and 5224 transitions. [2021-07-13 19:55:25,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:25,224 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:25,224 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:25,425 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable179 [2021-07-13 19:55:25,425 INFO L430 AbstractCegarLoop]: === Iteration 117 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:25,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:25,427 INFO L82 PathProgramCache]: Analyzing trace with hash 852668590, now seen corresponding path program 65 times [2021-07-13 19:55:25,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:25,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035344225] [2021-07-13 19:55:25,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:25,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:25,605 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:25,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:25,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035344225] [2021-07-13 19:55:25,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035344225] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:25,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255600215] [2021-07-13 19:55:25,606 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:25,633 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-07-13 19:55:25,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:25,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:25,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:25,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:55:25,828 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:55:25,829 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:55:25,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 13 [2021-07-13 19:55:25,831 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:25,837 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:25,839 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:25,839 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:7 [2021-07-13 19:55:25,906 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:25,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1255600215] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:25,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:25,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:55:25,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434050169] [2021-07-13 19:55:25,907 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:55:25,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:25,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:55:25,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:55:25,908 INFO L87 Difference]: Start difference. First operand 1514 states and 5224 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:28,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:28,127 INFO L93 Difference]: Finished difference Result 2184 states and 7332 transitions. [2021-07-13 19:55:28,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-07-13 19:55:28,127 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:28,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:28,131 INFO L225 Difference]: With dead ends: 2184 [2021-07-13 19:55:28,131 INFO L226 Difference]: Without dead ends: 2150 [2021-07-13 19:55:28,132 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1203 ImplicationChecksByTransitivity, 1880.8ms TimeCoverageRelationStatistics Valid=513, Invalid=3777, Unknown=0, NotChecked=0, Total=4290 [2021-07-13 19:55:28,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2150 states. [2021-07-13 19:55:28,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2150 to 1509. [2021-07-13 19:55:28,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1509 states, 1508 states have (on average 3.453580901856764) internal successors, (5208), 1508 states have internal predecessors, (5208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:28,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1509 states to 1509 states and 5208 transitions. [2021-07-13 19:55:28,152 INFO L78 Accepts]: Start accepts. Automaton has 1509 states and 5208 transitions. Word has length 24 [2021-07-13 19:55:28,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:28,152 INFO L482 AbstractCegarLoop]: Abstraction has 1509 states and 5208 transitions. [2021-07-13 19:55:28,152 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:28,152 INFO L276 IsEmpty]: Start isEmpty. Operand 1509 states and 5208 transitions. [2021-07-13 19:55:28,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:28,154 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:28,154 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:28,354 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable180,106 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:28,355 INFO L430 AbstractCegarLoop]: === Iteration 118 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:28,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:28,355 INFO L82 PathProgramCache]: Analyzing trace with hash 2111150986, now seen corresponding path program 18 times [2021-07-13 19:55:28,355 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:28,355 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233606020] [2021-07-13 19:55:28,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:28,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:28,575 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:28,575 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:28,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233606020] [2021-07-13 19:55:28,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233606020] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:28,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035052804] [2021-07-13 19:55:28,575 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:28,605 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:55:28,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:28,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:55:28,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:28,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:55:28,818 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:55:28,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:55:28,819 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:28,823 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:28,824 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:28,824 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:55:28,858 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:28,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035052804] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:28,858 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:28,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:55:28,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969189940] [2021-07-13 19:55:28,859 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:55:28,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:28,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:55:28,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:55:28,859 INFO L87 Difference]: Start difference. First operand 1509 states and 5208 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:31,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:31,149 INFO L93 Difference]: Finished difference Result 2330 states and 7756 transitions. [2021-07-13 19:55:31,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-07-13 19:55:31,150 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:31,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:31,154 INFO L225 Difference]: With dead ends: 2330 [2021-07-13 19:55:31,154 INFO L226 Difference]: Without dead ends: 2272 [2021-07-13 19:55:31,154 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1214 ImplicationChecksByTransitivity, 1967.3ms TimeCoverageRelationStatistics Valid=553, Invalid=3479, Unknown=0, NotChecked=0, Total=4032 [2021-07-13 19:55:31,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2272 states. [2021-07-13 19:55:31,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2272 to 1512. [2021-07-13 19:55:31,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1512 states, 1511 states have (on average 3.4533421575115817) internal successors, (5218), 1511 states have internal predecessors, (5218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:31,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 5218 transitions. [2021-07-13 19:55:31,190 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 5218 transitions. Word has length 24 [2021-07-13 19:55:31,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:31,190 INFO L482 AbstractCegarLoop]: Abstraction has 1512 states and 5218 transitions. [2021-07-13 19:55:31,190 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:31,190 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 5218 transitions. [2021-07-13 19:55:31,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:31,193 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:31,193 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:31,393 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable181,107 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:31,393 INFO L430 AbstractCegarLoop]: === Iteration 119 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:31,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:31,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1083001126, now seen corresponding path program 19 times [2021-07-13 19:55:31,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:31,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136961119] [2021-07-13 19:55:31,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:31,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:31,560 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:31,560 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:31,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136961119] [2021-07-13 19:55:31,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136961119] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:31,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471869518] [2021-07-13 19:55:31,561 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:31,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:31,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:31,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:31,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:31,707 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:31,710 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:31,710 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:31,710 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:31,755 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:31,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471869518] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:31,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:31,756 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:55:31,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733481878] [2021-07-13 19:55:31,756 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:55:31,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:31,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:55:31,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:55:31,756 INFO L87 Difference]: Start difference. First operand 1512 states and 5218 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:33,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:33,435 INFO L93 Difference]: Finished difference Result 2195 states and 7393 transitions. [2021-07-13 19:55:33,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 19:55:33,435 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:33,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:33,439 INFO L225 Difference]: With dead ends: 2195 [2021-07-13 19:55:33,439 INFO L226 Difference]: Without dead ends: 2169 [2021-07-13 19:55:33,439 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 789 ImplicationChecksByTransitivity, 1364.7ms TimeCoverageRelationStatistics Valid=418, Invalid=2234, Unknown=0, NotChecked=0, Total=2652 [2021-07-13 19:55:33,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2169 states. [2021-07-13 19:55:33,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2169 to 1515. [2021-07-13 19:55:33,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1515 states, 1514 states have (on average 3.451783355350066) internal successors, (5226), 1514 states have internal predecessors, (5226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:33,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1515 states to 1515 states and 5226 transitions. [2021-07-13 19:55:33,462 INFO L78 Accepts]: Start accepts. Automaton has 1515 states and 5226 transitions. Word has length 24 [2021-07-13 19:55:33,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:33,462 INFO L482 AbstractCegarLoop]: Abstraction has 1515 states and 5226 transitions. [2021-07-13 19:55:33,462 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:33,462 INFO L276 IsEmpty]: Start isEmpty. Operand 1515 states and 5226 transitions. [2021-07-13 19:55:33,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:33,464 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:33,464 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:33,665 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable182,108 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:33,665 INFO L430 AbstractCegarLoop]: === Iteration 120 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:33,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:33,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1406587304, now seen corresponding path program 20 times [2021-07-13 19:55:33,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:33,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085140648] [2021-07-13 19:55:33,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:33,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:33,840 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:33,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:33,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085140648] [2021-07-13 19:55:33,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085140648] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:33,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051132590] [2021-07-13 19:55:33,840 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:33,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:55:33,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:33,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:55:33,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:34,021 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:34,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:55:34,026 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:34,036 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:34,037 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:34,037 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:55:34,153 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:34,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051132590] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:34,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:34,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:55:34,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177120125] [2021-07-13 19:55:34,153 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:55:34,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:34,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:55:34,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:55:34,154 INFO L87 Difference]: Start difference. First operand 1515 states and 5226 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:36,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:36,731 INFO L93 Difference]: Finished difference Result 2274 states and 7562 transitions. [2021-07-13 19:55:36,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-07-13 19:55:36,732 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:36,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:36,736 INFO L225 Difference]: With dead ends: 2274 [2021-07-13 19:55:36,736 INFO L226 Difference]: Without dead ends: 2243 [2021-07-13 19:55:36,736 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 2102.5ms TimeCoverageRelationStatistics Valid=590, Invalid=3570, Unknown=0, NotChecked=0, Total=4160 [2021-07-13 19:55:36,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2243 states. [2021-07-13 19:55:36,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2243 to 1527. [2021-07-13 19:55:36,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1527 states, 1526 states have (on average 3.450851900393185) internal successors, (5266), 1526 states have internal predecessors, (5266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:36,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1527 states to 1527 states and 5266 transitions. [2021-07-13 19:55:36,760 INFO L78 Accepts]: Start accepts. Automaton has 1527 states and 5266 transitions. Word has length 24 [2021-07-13 19:55:36,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:36,760 INFO L482 AbstractCegarLoop]: Abstraction has 1527 states and 5266 transitions. [2021-07-13 19:55:36,760 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:36,760 INFO L276 IsEmpty]: Start isEmpty. Operand 1527 states and 5266 transitions. [2021-07-13 19:55:36,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:36,763 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:36,763 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:36,967 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable183,109 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:36,967 INFO L430 AbstractCegarLoop]: === Iteration 121 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:36,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:36,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1202635870, now seen corresponding path program 21 times [2021-07-13 19:55:36,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:36,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846879005] [2021-07-13 19:55:36,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:36,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:37,132 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:37,132 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:37,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846879005] [2021-07-13 19:55:37,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846879005] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:37,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699293182] [2021-07-13 19:55:37,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:37,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:55:37,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:37,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:37,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:37,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:37,290 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:37,293 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:37,293 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:37,293 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:37,336 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:37,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699293182] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:37,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:37,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:55:37,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306844053] [2021-07-13 19:55:37,337 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:55:37,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:37,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:55:37,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:55:37,338 INFO L87 Difference]: Start difference. First operand 1527 states and 5266 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:38,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:38,925 INFO L93 Difference]: Finished difference Result 2109 states and 7137 transitions. [2021-07-13 19:55:38,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-07-13 19:55:38,926 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:38,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:38,930 INFO L225 Difference]: With dead ends: 2109 [2021-07-13 19:55:38,930 INFO L226 Difference]: Without dead ends: 2092 [2021-07-13 19:55:38,930 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 1271.7ms TimeCoverageRelationStatistics Valid=359, Invalid=2091, Unknown=0, NotChecked=0, Total=2450 [2021-07-13 19:55:38,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2092 states. [2021-07-13 19:55:38,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2092 to 1518. [2021-07-13 19:55:38,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1518 states, 1517 states have (on average 3.4535266974291363) internal successors, (5239), 1517 states have internal predecessors, (5239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:38,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1518 states to 1518 states and 5239 transitions. [2021-07-13 19:55:38,951 INFO L78 Accepts]: Start accepts. Automaton has 1518 states and 5239 transitions. Word has length 24 [2021-07-13 19:55:38,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:38,951 INFO L482 AbstractCegarLoop]: Abstraction has 1518 states and 5239 transitions. [2021-07-13 19:55:38,951 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:38,951 INFO L276 IsEmpty]: Start isEmpty. Operand 1518 states and 5239 transitions. [2021-07-13 19:55:38,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:38,953 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:38,953 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:39,153 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable186,110 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:39,154 INFO L430 AbstractCegarLoop]: === Iteration 122 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:39,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:39,154 INFO L82 PathProgramCache]: Analyzing trace with hash -743658084, now seen corresponding path program 66 times [2021-07-13 19:55:39,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:39,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871895864] [2021-07-13 19:55:39,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:39,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:39,317 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:39,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:39,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871895864] [2021-07-13 19:55:39,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871895864] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:39,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208730279] [2021-07-13 19:55:39,317 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:39,345 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-07-13 19:55:39,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:39,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:55:39,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:39,488 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:39,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:55:39,490 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:39,500 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:39,501 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:39,501 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:55:39,588 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:39,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1208730279] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:39,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:39,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:55:39,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482054068] [2021-07-13 19:55:39,588 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:55:39,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:39,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:55:39,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:55:39,589 INFO L87 Difference]: Start difference. First operand 1518 states and 5239 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:42,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:42,504 INFO L93 Difference]: Finished difference Result 2778 states and 9114 transitions. [2021-07-13 19:55:42,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-07-13 19:55:42,505 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:42,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:42,510 INFO L225 Difference]: With dead ends: 2778 [2021-07-13 19:55:42,510 INFO L226 Difference]: Without dead ends: 2741 [2021-07-13 19:55:42,511 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2494 ImplicationChecksByTransitivity, 2425.8ms TimeCoverageRelationStatistics Valid=924, Invalid=6048, Unknown=0, NotChecked=0, Total=6972 [2021-07-13 19:55:42,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2741 states. [2021-07-13 19:55:42,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2741 to 1535. [2021-07-13 19:55:42,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1535 states, 1534 states have (on average 3.4615384615384617) internal successors, (5310), 1534 states have internal predecessors, (5310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:42,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1535 states to 1535 states and 5310 transitions. [2021-07-13 19:55:42,537 INFO L78 Accepts]: Start accepts. Automaton has 1535 states and 5310 transitions. Word has length 24 [2021-07-13 19:55:42,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:42,537 INFO L482 AbstractCegarLoop]: Abstraction has 1535 states and 5310 transitions. [2021-07-13 19:55:42,537 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:42,537 INFO L276 IsEmpty]: Start isEmpty. Operand 1535 states and 5310 transitions. [2021-07-13 19:55:42,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:42,539 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:42,539 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:42,740 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable187,111 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:42,741 INFO L430 AbstractCegarLoop]: === Iteration 123 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:42,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:42,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1760448038, now seen corresponding path program 67 times [2021-07-13 19:55:42,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:42,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279372311] [2021-07-13 19:55:42,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:42,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:42,908 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:42,908 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:42,908 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279372311] [2021-07-13 19:55:42,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279372311] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:42,908 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700177285] [2021-07-13 19:55:42,909 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:42,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:42,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:42,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:43,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:43,056 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:43,058 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:43,059 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:43,059 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:43,109 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:43,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700177285] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:43,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:43,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:55:43,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088178685] [2021-07-13 19:55:43,110 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:55:43,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:43,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:55:43,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:55:43,110 INFO L87 Difference]: Start difference. First operand 1535 states and 5310 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:45,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:45,691 INFO L93 Difference]: Finished difference Result 2830 states and 9291 transitions. [2021-07-13 19:55:45,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-07-13 19:55:45,692 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:45,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:45,697 INFO L225 Difference]: With dead ends: 2830 [2021-07-13 19:55:45,697 INFO L226 Difference]: Without dead ends: 2787 [2021-07-13 19:55:45,698 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2185 ImplicationChecksByTransitivity, 2117.1ms TimeCoverageRelationStatistics Valid=868, Invalid=5294, Unknown=0, NotChecked=0, Total=6162 [2021-07-13 19:55:45,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2787 states. [2021-07-13 19:55:45,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2787 to 1554. [2021-07-13 19:55:45,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1554 states, 1553 states have (on average 3.4745653573728266) internal successors, (5396), 1553 states have internal predecessors, (5396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:45,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1554 states to 1554 states and 5396 transitions. [2021-07-13 19:55:45,741 INFO L78 Accepts]: Start accepts. Automaton has 1554 states and 5396 transitions. Word has length 24 [2021-07-13 19:55:45,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:45,741 INFO L482 AbstractCegarLoop]: Abstraction has 1554 states and 5396 transitions. [2021-07-13 19:55:45,741 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:45,741 INFO L276 IsEmpty]: Start isEmpty. Operand 1554 states and 5396 transitions. [2021-07-13 19:55:45,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:45,743 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:45,743 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:45,944 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable189 [2021-07-13 19:55:45,944 INFO L430 AbstractCegarLoop]: === Iteration 124 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:45,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:45,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1493814354, now seen corresponding path program 22 times [2021-07-13 19:55:45,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:45,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160222605] [2021-07-13 19:55:45,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:45,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:46,110 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:46,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:46,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160222605] [2021-07-13 19:55:46,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160222605] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:46,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915115091] [2021-07-13 19:55:46,111 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:46,148 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:55:46,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:46,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:46,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:46,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:46,278 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:46,281 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:46,281 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:46,281 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:46,336 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:46,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915115091] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:46,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:46,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:55:46,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24018794] [2021-07-13 19:55:46,337 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:55:46,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:46,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:55:46,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:55:46,337 INFO L87 Difference]: Start difference. First operand 1554 states and 5396 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:48,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:48,895 INFO L93 Difference]: Finished difference Result 2881 states and 9430 transitions. [2021-07-13 19:55:48,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-07-13 19:55:48,895 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:48,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:48,901 INFO L225 Difference]: With dead ends: 2881 [2021-07-13 19:55:48,901 INFO L226 Difference]: Without dead ends: 2832 [2021-07-13 19:55:48,901 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2147 ImplicationChecksByTransitivity, 2155.4ms TimeCoverageRelationStatistics Valid=911, Invalid=5095, Unknown=0, NotChecked=0, Total=6006 [2021-07-13 19:55:48,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2832 states. [2021-07-13 19:55:48,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2832 to 1582. [2021-07-13 19:55:48,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1582 states, 1581 states have (on average 3.4927261227071473) internal successors, (5522), 1581 states have internal predecessors, (5522), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:48,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1582 states to 1582 states and 5522 transitions. [2021-07-13 19:55:48,929 INFO L78 Accepts]: Start accepts. Automaton has 1582 states and 5522 transitions. Word has length 24 [2021-07-13 19:55:48,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:48,930 INFO L482 AbstractCegarLoop]: Abstraction has 1582 states and 5522 transitions. [2021-07-13 19:55:48,930 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:48,930 INFO L276 IsEmpty]: Start isEmpty. Operand 1582 states and 5522 transitions. [2021-07-13 19:55:48,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:48,932 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:48,932 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:49,132 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable190 [2021-07-13 19:55:49,133 INFO L430 AbstractCegarLoop]: === Iteration 125 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:49,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:49,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1817400532, now seen corresponding path program 23 times [2021-07-13 19:55:49,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:49,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130070672] [2021-07-13 19:55:49,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:49,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:49,342 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:49,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:49,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130070672] [2021-07-13 19:55:49,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130070672] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:49,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871489877] [2021-07-13 19:55:49,343 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:49,379 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:55:49,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:49,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:55:49,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:49,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:55:49,509 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:49,512 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:49,512 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:49,512 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:55:49,562 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:49,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871489877] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:49,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:49,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:55:49,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557820487] [2021-07-13 19:55:49,563 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:55:49,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:49,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:55:49,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:55:49,563 INFO L87 Difference]: Start difference. First operand 1582 states and 5522 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:51,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:51,941 INFO L93 Difference]: Finished difference Result 2726 states and 9045 transitions. [2021-07-13 19:55:51,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-07-13 19:55:51,942 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:51,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:51,947 INFO L225 Difference]: With dead ends: 2726 [2021-07-13 19:55:51,947 INFO L226 Difference]: Without dead ends: 2706 [2021-07-13 19:55:51,947 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1946 ImplicationChecksByTransitivity, 2036.2ms TimeCoverageRelationStatistics Valid=828, Invalid=4722, Unknown=0, NotChecked=0, Total=5550 [2021-07-13 19:55:51,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2706 states. [2021-07-13 19:55:51,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2706 to 1576. [2021-07-13 19:55:51,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1576 states, 1575 states have (on average 3.493333333333333) internal successors, (5502), 1575 states have internal predecessors, (5502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:51,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1576 states to 1576 states and 5502 transitions. [2021-07-13 19:55:51,975 INFO L78 Accepts]: Start accepts. Automaton has 1576 states and 5502 transitions. Word has length 24 [2021-07-13 19:55:51,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:51,975 INFO L482 AbstractCegarLoop]: Abstraction has 1576 states and 5502 transitions. [2021-07-13 19:55:51,975 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:51,976 INFO L276 IsEmpty]: Start isEmpty. Operand 1576 states and 5502 transitions. [2021-07-13 19:55:51,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:51,978 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:51,978 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:52,192 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable191,114 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:52,193 INFO L430 AbstractCegarLoop]: === Iteration 126 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:52,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:52,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1940644096, now seen corresponding path program 68 times [2021-07-13 19:55:52,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:52,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470359441] [2021-07-13 19:55:52,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:52,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:52,353 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:52,353 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:52,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470359441] [2021-07-13 19:55:52,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470359441] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:52,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499335529] [2021-07-13 19:55:52,353 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:52,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:55:52,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:52,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:55:52,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:52,539 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:52,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:55:52,540 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:52,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:52,550 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:52,550 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 19:55:52,632 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:52,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499335529] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:52,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:52,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:55:52,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655088262] [2021-07-13 19:55:52,633 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:55:52,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:52,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:55:52,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:55:52,633 INFO L87 Difference]: Start difference. First operand 1576 states and 5502 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:56,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:55:56,046 INFO L93 Difference]: Finished difference Result 2803 states and 9390 transitions. [2021-07-13 19:55:56,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-07-13 19:55:56,046 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:55:56,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:55:56,051 INFO L225 Difference]: With dead ends: 2803 [2021-07-13 19:55:56,051 INFO L226 Difference]: Without dead ends: 2781 [2021-07-13 19:55:56,052 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2648 ImplicationChecksByTransitivity, 2833.0ms TimeCoverageRelationStatistics Valid=988, Invalid=6322, Unknown=0, NotChecked=0, Total=7310 [2021-07-13 19:55:56,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2781 states. [2021-07-13 19:55:56,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2781 to 1592. [2021-07-13 19:55:56,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1592 states, 1591 states have (on average 3.508485229415462) internal successors, (5582), 1591 states have internal predecessors, (5582), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:56,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1592 states to 1592 states and 5582 transitions. [2021-07-13 19:55:56,085 INFO L78 Accepts]: Start accepts. Automaton has 1592 states and 5582 transitions. Word has length 24 [2021-07-13 19:55:56,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:55:56,085 INFO L482 AbstractCegarLoop]: Abstraction has 1592 states and 5582 transitions. [2021-07-13 19:55:56,085 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:55:56,085 INFO L276 IsEmpty]: Start isEmpty. Operand 1592 states and 5582 transitions. [2021-07-13 19:55:56,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:55:56,088 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:55:56,088 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:55:56,307 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable192,115 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:56,307 INFO L430 AbstractCegarLoop]: === Iteration 127 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:55:56,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:55:56,307 INFO L82 PathProgramCache]: Analyzing trace with hash -2145562230, now seen corresponding path program 24 times [2021-07-13 19:55:56,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:55:56,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587882364] [2021-07-13 19:55:56,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:55:56,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:55:56,469 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:56,469 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:55:56,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587882364] [2021-07-13 19:55:56,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587882364] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:56,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527631733] [2021-07-13 19:55:56,470 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:55:56,497 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:55:56,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:55:56,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:55:56,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:55:56,659 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:56,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:55:56,660 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:55:56,669 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:55:56,670 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:55:56,670 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:27 [2021-07-13 19:55:56,754 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:55:56,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527631733] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:55:56,754 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:55:56,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:55:56,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878140827] [2021-07-13 19:55:56,755 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:55:56,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:55:56,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:55:56,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:55:56,755 INFO L87 Difference]: Start difference. First operand 1592 states and 5582 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:00,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:00,058 INFO L93 Difference]: Finished difference Result 2820 states and 9359 transitions. [2021-07-13 19:56:00,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-07-13 19:56:00,058 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:00,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:00,063 INFO L225 Difference]: With dead ends: 2820 [2021-07-13 19:56:00,063 INFO L226 Difference]: Without dead ends: 2800 [2021-07-13 19:56:00,064 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2682 ImplicationChecksByTransitivity, 2905.6ms TimeCoverageRelationStatistics Valid=1088, Invalid=6222, Unknown=0, NotChecked=0, Total=7310 [2021-07-13 19:56:00,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2800 states. [2021-07-13 19:56:00,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2800 to 1593. [2021-07-13 19:56:00,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1593 states, 1592 states have (on average 3.5069095477386933) internal successors, (5583), 1592 states have internal predecessors, (5583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:00,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1593 states to 1593 states and 5583 transitions. [2021-07-13 19:56:00,093 INFO L78 Accepts]: Start accepts. Automaton has 1593 states and 5583 transitions. Word has length 24 [2021-07-13 19:56:00,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:00,093 INFO L482 AbstractCegarLoop]: Abstraction has 1593 states and 5583 transitions. [2021-07-13 19:56:00,093 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:00,093 INFO L276 IsEmpty]: Start isEmpty. Operand 1593 states and 5583 transitions. [2021-07-13 19:56:00,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:00,095 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:00,095 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:00,297 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable194 [2021-07-13 19:56:00,298 INFO L430 AbstractCegarLoop]: === Iteration 128 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:00,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:00,298 INFO L82 PathProgramCache]: Analyzing trace with hash -459818108, now seen corresponding path program 25 times [2021-07-13 19:56:00,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:00,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521795898] [2021-07-13 19:56:00,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:00,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:00,484 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:00,484 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:00,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521795898] [2021-07-13 19:56:00,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521795898] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:00,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019507814] [2021-07-13 19:56:00,484 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:00,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:00,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:00,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:00,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:00,645 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:00,647 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:00,647 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:00,648 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:56:00,678 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:00,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019507814] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:00,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:00,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:56:00,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541724315] [2021-07-13 19:56:00,679 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:56:00,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:00,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:56:00,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:56:00,680 INFO L87 Difference]: Start difference. First operand 1593 states and 5583 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:02,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:02,904 INFO L93 Difference]: Finished difference Result 2662 states and 8908 transitions. [2021-07-13 19:56:02,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-07-13 19:56:02,904 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:02,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:02,909 INFO L225 Difference]: With dead ends: 2662 [2021-07-13 19:56:02,909 INFO L226 Difference]: Without dead ends: 2629 [2021-07-13 19:56:02,910 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1718 ImplicationChecksByTransitivity, 1958.9ms TimeCoverageRelationStatistics Valid=738, Invalid=4092, Unknown=0, NotChecked=0, Total=4830 [2021-07-13 19:56:02,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2629 states. [2021-07-13 19:56:02,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2629 to 1589. [2021-07-13 19:56:02,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1589 states, 1588 states have (on average 3.5025188916876573) internal successors, (5562), 1588 states have internal predecessors, (5562), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:02,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1589 states to 1589 states and 5562 transitions. [2021-07-13 19:56:02,949 INFO L78 Accepts]: Start accepts. Automaton has 1589 states and 5562 transitions. Word has length 24 [2021-07-13 19:56:02,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:02,949 INFO L482 AbstractCegarLoop]: Abstraction has 1589 states and 5562 transitions. [2021-07-13 19:56:02,949 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:02,950 INFO L276 IsEmpty]: Start isEmpty. Operand 1589 states and 5562 transitions. [2021-07-13 19:56:02,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:02,952 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:02,952 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:03,156 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable197,117 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:03,156 INFO L430 AbstractCegarLoop]: === Iteration 129 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:03,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:03,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1985018250, now seen corresponding path program 26 times [2021-07-13 19:56:03,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:03,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072691084] [2021-07-13 19:56:03,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:03,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:03,336 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:03,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:03,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072691084] [2021-07-13 19:56:03,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072691084] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:03,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343426716] [2021-07-13 19:56:03,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:03,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:56:03,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:03,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:56:03,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:03,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:03,637 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:56:03,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:03,639 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:03,643 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:03,645 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:03,645 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:56:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:03,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343426716] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:03,684 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:03,684 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:56:03,684 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670198059] [2021-07-13 19:56:03,684 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:03,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:03,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:03,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:03,685 INFO L87 Difference]: Start difference. First operand 1589 states and 5562 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:06,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:06,384 INFO L93 Difference]: Finished difference Result 3367 states and 11408 transitions. [2021-07-13 19:56:06,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-07-13 19:56:06,384 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:06,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:06,390 INFO L225 Difference]: With dead ends: 3367 [2021-07-13 19:56:06,390 INFO L226 Difference]: Without dead ends: 3341 [2021-07-13 19:56:06,390 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1266 ImplicationChecksByTransitivity, 2254.2ms TimeCoverageRelationStatistics Valid=538, Invalid=4018, Unknown=0, NotChecked=0, Total=4556 [2021-07-13 19:56:06,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3341 states. [2021-07-13 19:56:06,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3341 to 1591. [2021-07-13 19:56:06,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1591 states, 1590 states have (on average 3.5018867924528303) internal successors, (5568), 1590 states have internal predecessors, (5568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:06,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1591 states to 1591 states and 5568 transitions. [2021-07-13 19:56:06,419 INFO L78 Accepts]: Start accepts. Automaton has 1591 states and 5568 transitions. Word has length 24 [2021-07-13 19:56:06,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:06,419 INFO L482 AbstractCegarLoop]: Abstraction has 1591 states and 5568 transitions. [2021-07-13 19:56:06,419 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:06,419 INFO L276 IsEmpty]: Start isEmpty. Operand 1591 states and 5568 transitions. [2021-07-13 19:56:06,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:06,422 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:06,422 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:06,622 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable198,118 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:06,622 INFO L430 AbstractCegarLoop]: === Iteration 130 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:06,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:06,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1800433182, now seen corresponding path program 27 times [2021-07-13 19:56:06,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:06,623 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008186613] [2021-07-13 19:56:06,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:06,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:06,817 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:06,817 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:06,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008186613] [2021-07-13 19:56:06,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008186613] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:06,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191177219] [2021-07-13 19:56:06,817 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:06,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:56:06,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:06,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:56:06,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:07,017 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:07,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:56:07,018 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:07,027 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:07,028 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:07,028 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 19:56:07,126 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:07,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191177219] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:07,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:07,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:56:07,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611273212] [2021-07-13 19:56:07,127 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:07,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:07,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:07,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:07,128 INFO L87 Difference]: Start difference. First operand 1591 states and 5568 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:10,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:10,235 INFO L93 Difference]: Finished difference Result 2710 states and 9124 transitions. [2021-07-13 19:56:10,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-07-13 19:56:10,235 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:10,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:10,240 INFO L225 Difference]: With dead ends: 2710 [2021-07-13 19:56:10,240 INFO L226 Difference]: Without dead ends: 2683 [2021-07-13 19:56:10,241 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1536 ImplicationChecksByTransitivity, 2544.5ms TimeCoverageRelationStatistics Valid=744, Invalid=4368, Unknown=0, NotChecked=0, Total=5112 [2021-07-13 19:56:10,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2683 states. [2021-07-13 19:56:10,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2683 to 1600. [2021-07-13 19:56:10,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1600 states, 1599 states have (on average 3.50281425891182) internal successors, (5601), 1599 states have internal predecessors, (5601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:10,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1600 states to 1600 states and 5601 transitions. [2021-07-13 19:56:10,268 INFO L78 Accepts]: Start accepts. Automaton has 1600 states and 5601 transitions. Word has length 24 [2021-07-13 19:56:10,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:10,268 INFO L482 AbstractCegarLoop]: Abstraction has 1600 states and 5601 transitions. [2021-07-13 19:56:10,268 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:10,268 INFO L276 IsEmpty]: Start isEmpty. Operand 1600 states and 5601 transitions. [2021-07-13 19:56:10,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:10,270 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:10,270 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:10,471 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable199 [2021-07-13 19:56:10,471 INFO L430 AbstractCegarLoop]: === Iteration 131 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:10,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:10,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1590895802, now seen corresponding path program 28 times [2021-07-13 19:56:10,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:10,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033831667] [2021-07-13 19:56:10,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:10,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:10,683 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:10,683 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:10,683 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033831667] [2021-07-13 19:56:10,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033831667] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:10,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627047671] [2021-07-13 19:56:10,684 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:10,710 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:56:10,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:10,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:10,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:10,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:10,912 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:10,914 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:10,914 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:10,914 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:56:10,950 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:10,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627047671] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:10,950 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:10,950 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:56:10,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234521163] [2021-07-13 19:56:10,950 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:56:10,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:10,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:56:10,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:56:10,951 INFO L87 Difference]: Start difference. First operand 1600 states and 5601 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:13,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:13,016 INFO L93 Difference]: Finished difference Result 2564 states and 8676 transitions. [2021-07-13 19:56:13,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-07-13 19:56:13,017 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:13,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:13,021 INFO L225 Difference]: With dead ends: 2564 [2021-07-13 19:56:13,022 INFO L226 Difference]: Without dead ends: 2535 [2021-07-13 19:56:13,022 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 1610.3ms TimeCoverageRelationStatistics Valid=402, Invalid=2460, Unknown=0, NotChecked=0, Total=2862 [2021-07-13 19:56:13,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2535 states. [2021-07-13 19:56:13,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2535 to 1605. [2021-07-13 19:56:13,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1605 states, 1604 states have (on average 3.501870324189526) internal successors, (5617), 1604 states have internal predecessors, (5617), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:13,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1605 states to 1605 states and 5617 transitions. [2021-07-13 19:56:13,057 INFO L78 Accepts]: Start accepts. Automaton has 1605 states and 5617 transitions. Word has length 24 [2021-07-13 19:56:13,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:13,057 INFO L482 AbstractCegarLoop]: Abstraction has 1605 states and 5617 transitions. [2021-07-13 19:56:13,057 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:13,057 INFO L276 IsEmpty]: Start isEmpty. Operand 1605 states and 5617 transitions. [2021-07-13 19:56:13,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:13,061 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:13,061 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:13,280 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable202 [2021-07-13 19:56:13,280 INFO L430 AbstractCegarLoop]: === Iteration 132 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:13,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:13,281 INFO L82 PathProgramCache]: Analyzing trace with hash -975399748, now seen corresponding path program 29 times [2021-07-13 19:56:13,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:13,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052116334] [2021-07-13 19:56:13,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:13,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:13,501 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:13,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:13,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052116334] [2021-07-13 19:56:13,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052116334] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:13,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660747507] [2021-07-13 19:56:13,501 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:13,529 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:56:13,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:13,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:13,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:13,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:13,729 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:13,730 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:13,731 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:13,731 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:56:13,761 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:13,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660747507] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:13,761 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:13,761 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:56:13,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98576103] [2021-07-13 19:56:13,761 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:56:13,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:13,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:56:13,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:56:13,762 INFO L87 Difference]: Start difference. First operand 1605 states and 5617 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:15,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:15,593 INFO L93 Difference]: Finished difference Result 2491 states and 8452 transitions. [2021-07-13 19:56:15,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 19:56:15,594 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:15,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:15,599 INFO L225 Difference]: With dead ends: 2491 [2021-07-13 19:56:15,599 INFO L226 Difference]: Without dead ends: 2462 [2021-07-13 19:56:15,599 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 1527.1ms TimeCoverageRelationStatistics Valid=402, Invalid=2354, Unknown=0, NotChecked=0, Total=2756 [2021-07-13 19:56:15,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2462 states. [2021-07-13 19:56:15,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2462 to 1598. [2021-07-13 19:56:15,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1598 states, 1597 states have (on average 3.504696305572949) internal successors, (5597), 1597 states have internal predecessors, (5597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:15,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1598 states to 1598 states and 5597 transitions. [2021-07-13 19:56:15,627 INFO L78 Accepts]: Start accepts. Automaton has 1598 states and 5597 transitions. Word has length 24 [2021-07-13 19:56:15,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:15,627 INFO L482 AbstractCegarLoop]: Abstraction has 1598 states and 5597 transitions. [2021-07-13 19:56:15,628 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:15,628 INFO L276 IsEmpty]: Start isEmpty. Operand 1598 states and 5597 transitions. [2021-07-13 19:56:15,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:15,630 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:15,630 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:15,830 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable203,121 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:15,830 INFO L430 AbstractCegarLoop]: === Iteration 133 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:15,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:15,831 INFO L82 PathProgramCache]: Analyzing trace with hash -2003549608, now seen corresponding path program 30 times [2021-07-13 19:56:15,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:15,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202930322] [2021-07-13 19:56:15,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:15,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:16,008 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:16,008 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:16,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202930322] [2021-07-13 19:56:16,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202930322] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:16,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199061577] [2021-07-13 19:56:16,008 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:16,036 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:56:16,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:16,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:16,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:16,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:16,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:16,206 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:16,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 39 [2021-07-13 19:56:16,208 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:16,222 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:16,223 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:16,223 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:36 [2021-07-13 19:56:16,340 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:16,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199061577] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:16,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:16,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:56:16,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973276645] [2021-07-13 19:56:16,341 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:16,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:16,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:16,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:16,341 INFO L87 Difference]: Start difference. First operand 1598 states and 5597 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:18,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:18,280 INFO L93 Difference]: Finished difference Result 2374 states and 8085 transitions. [2021-07-13 19:56:18,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-07-13 19:56:18,280 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:18,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:18,285 INFO L225 Difference]: With dead ends: 2374 [2021-07-13 19:56:18,285 INFO L226 Difference]: Without dead ends: 2357 [2021-07-13 19:56:18,285 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1041 ImplicationChecksByTransitivity, 1702.4ms TimeCoverageRelationStatistics Valid=625, Invalid=3035, Unknown=0, NotChecked=0, Total=3660 [2021-07-13 19:56:18,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2357 states. [2021-07-13 19:56:18,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2357 to 1611. [2021-07-13 19:56:18,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1611 states, 1610 states have (on average 3.5012422360248445) internal successors, (5637), 1610 states have internal predecessors, (5637), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:18,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1611 states to 1611 states and 5637 transitions. [2021-07-13 19:56:18,310 INFO L78 Accepts]: Start accepts. Automaton has 1611 states and 5637 transitions. Word has length 24 [2021-07-13 19:56:18,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:18,310 INFO L482 AbstractCegarLoop]: Abstraction has 1611 states and 5637 transitions. [2021-07-13 19:56:18,310 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:18,310 INFO L276 IsEmpty]: Start isEmpty. Operand 1611 states and 5637 transitions. [2021-07-13 19:56:18,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:18,312 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:18,312 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:18,513 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable204 [2021-07-13 19:56:18,513 INFO L430 AbstractCegarLoop]: === Iteration 134 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:18,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:18,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1679963430, now seen corresponding path program 31 times [2021-07-13 19:56:18,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:18,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105684445] [2021-07-13 19:56:18,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:18,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:18,694 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:18,694 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:18,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105684445] [2021-07-13 19:56:18,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105684445] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:18,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989850557] [2021-07-13 19:56:18,695 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:18,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:18,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:18,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:18,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:56:18,884 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:18,886 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:18,887 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:18,887 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:56:18,936 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:18,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989850557] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:18,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:18,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:56:18,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406103712] [2021-07-13 19:56:18,936 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:56:18,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:18,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:56:18,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:56:18,937 INFO L87 Difference]: Start difference. First operand 1611 states and 5637 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:20,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:20,139 INFO L93 Difference]: Finished difference Result 2307 states and 7914 transitions. [2021-07-13 19:56:20,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:56:20,140 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:20,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:20,144 INFO L225 Difference]: With dead ends: 2307 [2021-07-13 19:56:20,144 INFO L226 Difference]: Without dead ends: 2296 [2021-07-13 19:56:20,145 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 987.7ms TimeCoverageRelationStatistics Valid=262, Invalid=1460, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:56:20,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2296 states. [2021-07-13 19:56:20,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2296 to 1596. [2021-07-13 19:56:20,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1596 states, 1595 states have (on average 3.5040752351097177) internal successors, (5589), 1595 states have internal predecessors, (5589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:20,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1596 states to 1596 states and 5589 transitions. [2021-07-13 19:56:20,170 INFO L78 Accepts]: Start accepts. Automaton has 1596 states and 5589 transitions. Word has length 24 [2021-07-13 19:56:20,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:20,170 INFO L482 AbstractCegarLoop]: Abstraction has 1596 states and 5589 transitions. [2021-07-13 19:56:20,170 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:20,170 INFO L276 IsEmpty]: Start isEmpty. Operand 1596 states and 5589 transitions. [2021-07-13 19:56:20,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:20,172 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:20,172 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:20,373 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208,123 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:20,373 INFO L430 AbstractCegarLoop]: === Iteration 135 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:20,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:20,373 INFO L82 PathProgramCache]: Analyzing trace with hash 772236998, now seen corresponding path program 32 times [2021-07-13 19:56:20,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:20,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466681268] [2021-07-13 19:56:20,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:20,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:20,576 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:20,576 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:20,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466681268] [2021-07-13 19:56:20,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466681268] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:20,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570889046] [2021-07-13 19:56:20,576 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:20,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:56:20,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:20,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:56:20,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:20,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:20,836 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:56:20,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:20,838 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:20,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:20,843 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:20,843 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:56:20,875 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:20,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570889046] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:20,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:20,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:56:20,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309754408] [2021-07-13 19:56:20,876 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:20,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:20,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:20,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:20,877 INFO L87 Difference]: Start difference. First operand 1596 states and 5589 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:23,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:23,804 INFO L93 Difference]: Finished difference Result 3315 states and 11270 transitions. [2021-07-13 19:56:23,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-07-13 19:56:23,804 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:23,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:23,811 INFO L225 Difference]: With dead ends: 3315 [2021-07-13 19:56:23,811 INFO L226 Difference]: Without dead ends: 3296 [2021-07-13 19:56:23,811 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1290 ImplicationChecksByTransitivity, 2384.2ms TimeCoverageRelationStatistics Valid=585, Invalid=4107, Unknown=0, NotChecked=0, Total=4692 [2021-07-13 19:56:23,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3296 states. [2021-07-13 19:56:23,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3296 to 1596. [2021-07-13 19:56:23,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1596 states, 1595 states have (on average 3.5040752351097177) internal successors, (5589), 1595 states have internal predecessors, (5589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:23,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1596 states to 1596 states and 5589 transitions. [2021-07-13 19:56:23,843 INFO L78 Accepts]: Start accepts. Automaton has 1596 states and 5589 transitions. Word has length 24 [2021-07-13 19:56:23,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:23,843 INFO L482 AbstractCegarLoop]: Abstraction has 1596 states and 5589 transitions. [2021-07-13 19:56:23,843 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:23,843 INFO L276 IsEmpty]: Start isEmpty. Operand 1596 states and 5589 transitions. [2021-07-13 19:56:23,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:23,845 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:23,846 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:24,046 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable209,124 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:24,046 INFO L430 AbstractCegarLoop]: === Iteration 136 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:24,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:24,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1068711792, now seen corresponding path program 33 times [2021-07-13 19:56:24,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:24,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81325503] [2021-07-13 19:56:24,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:24,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:24,280 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:24,280 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:24,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81325503] [2021-07-13 19:56:24,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81325503] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:24,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208816397] [2021-07-13 19:56:24,280 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:24,320 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:56:24,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:24,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:56:24,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:24,511 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:24,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:56:24,513 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:24,523 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:24,524 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:24,524 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 19:56:24,631 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:24,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208816397] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:24,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:24,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:56:24,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708755936] [2021-07-13 19:56:24,631 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:24,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:24,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:24,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:24,632 INFO L87 Difference]: Start difference. First operand 1596 states and 5589 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:26,064 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 54 [2021-07-13 19:56:27,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:27,928 INFO L93 Difference]: Finished difference Result 2689 states and 9043 transitions. [2021-07-13 19:56:27,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-07-13 19:56:27,928 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:27,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:27,933 INFO L225 Difference]: With dead ends: 2689 [2021-07-13 19:56:27,933 INFO L226 Difference]: Without dead ends: 2662 [2021-07-13 19:56:27,933 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 2766.6ms TimeCoverageRelationStatistics Valid=686, Invalid=4284, Unknown=0, NotChecked=0, Total=4970 [2021-07-13 19:56:27,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2662 states. [2021-07-13 19:56:27,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2662 to 1601. [2021-07-13 19:56:27,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1601 states, 1600 states have (on average 3.503125) internal successors, (5605), 1600 states have internal predecessors, (5605), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:27,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1601 states to 1601 states and 5605 transitions. [2021-07-13 19:56:27,959 INFO L78 Accepts]: Start accepts. Automaton has 1601 states and 5605 transitions. Word has length 24 [2021-07-13 19:56:27,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:27,959 INFO L482 AbstractCegarLoop]: Abstraction has 1601 states and 5605 transitions. [2021-07-13 19:56:27,959 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:27,959 INFO L276 IsEmpty]: Start isEmpty. Operand 1601 states and 5605 transitions. [2021-07-13 19:56:27,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:27,962 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:27,962 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:28,162 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable210 [2021-07-13 19:56:28,162 INFO L430 AbstractCegarLoop]: === Iteration 137 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:28,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:28,163 INFO L82 PathProgramCache]: Analyzing trace with hash 1073663896, now seen corresponding path program 34 times [2021-07-13 19:56:28,163 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:28,163 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139972878] [2021-07-13 19:56:28,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:28,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:28,383 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:28,383 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:28,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139972878] [2021-07-13 19:56:28,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139972878] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:28,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847565650] [2021-07-13 19:56:28,383 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:28,412 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:56:28,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:28,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:28,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:28,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:28,585 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:28,586 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:28,586 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:28,586 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:56:28,617 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:28,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847565650] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:28,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:28,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:56:28,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302503585] [2021-07-13 19:56:28,618 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:56:28,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:28,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:56:28,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:56:28,619 INFO L87 Difference]: Start difference. First operand 1601 states and 5605 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:30,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:30,641 INFO L93 Difference]: Finished difference Result 2578 states and 8710 transitions. [2021-07-13 19:56:30,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-07-13 19:56:30,641 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:30,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:30,646 INFO L225 Difference]: With dead ends: 2578 [2021-07-13 19:56:30,646 INFO L226 Difference]: Without dead ends: 2558 [2021-07-13 19:56:30,647 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 627 ImplicationChecksByTransitivity, 1539.4ms TimeCoverageRelationStatistics Valid=368, Invalid=2284, Unknown=0, NotChecked=0, Total=2652 [2021-07-13 19:56:30,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2558 states. [2021-07-13 19:56:30,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2558 to 1604. [2021-07-13 19:56:30,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1604 states, 1603 states have (on average 3.5015595757953837) internal successors, (5613), 1603 states have internal predecessors, (5613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:30,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1604 states to 1604 states and 5613 transitions. [2021-07-13 19:56:30,674 INFO L78 Accepts]: Start accepts. Automaton has 1604 states and 5613 transitions. Word has length 24 [2021-07-13 19:56:30,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:30,674 INFO L482 AbstractCegarLoop]: Abstraction has 1604 states and 5613 transitions. [2021-07-13 19:56:30,674 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:30,674 INFO L276 IsEmpty]: Start isEmpty. Operand 1604 states and 5613 transitions. [2021-07-13 19:56:30,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:30,676 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:30,677 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:30,877 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable213 [2021-07-13 19:56:30,877 INFO L430 AbstractCegarLoop]: === Iteration 138 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:30,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:30,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1285059888, now seen corresponding path program 35 times [2021-07-13 19:56:30,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:30,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871618400] [2021-07-13 19:56:30,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:30,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:31,105 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:31,105 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:31,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871618400] [2021-07-13 19:56:31,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871618400] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:31,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294165354] [2021-07-13 19:56:31,105 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:31,134 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:56:31,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:31,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:31,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:31,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:31,300 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:31,301 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:31,302 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:31,302 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:56:31,332 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:31,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294165354] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:31,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:31,332 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:56:31,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454778337] [2021-07-13 19:56:31,332 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:56:31,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:31,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:56:31,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:56:31,333 INFO L87 Difference]: Start difference. First operand 1604 states and 5613 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:33,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:33,071 INFO L93 Difference]: Finished difference Result 2511 states and 8501 transitions. [2021-07-13 19:56:33,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 19:56:33,072 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:33,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:33,076 INFO L225 Difference]: With dead ends: 2511 [2021-07-13 19:56:33,076 INFO L226 Difference]: Without dead ends: 2491 [2021-07-13 19:56:33,076 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 1425.5ms TimeCoverageRelationStatistics Valid=363, Invalid=2187, Unknown=0, NotChecked=0, Total=2550 [2021-07-13 19:56:33,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2491 states. [2021-07-13 19:56:33,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2491 to 1600. [2021-07-13 19:56:33,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1600 states, 1599 states have (on average 3.5053158223889933) internal successors, (5605), 1599 states have internal predecessors, (5605), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:33,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1600 states to 1600 states and 5605 transitions. [2021-07-13 19:56:33,101 INFO L78 Accepts]: Start accepts. Automaton has 1600 states and 5605 transitions. Word has length 24 [2021-07-13 19:56:33,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:33,101 INFO L482 AbstractCegarLoop]: Abstraction has 1600 states and 5605 transitions. [2021-07-13 19:56:33,101 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:33,101 INFO L276 IsEmpty]: Start isEmpty. Operand 1600 states and 5605 transitions. [2021-07-13 19:56:33,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:33,103 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:33,104 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:33,304 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable214,127 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:33,304 INFO L430 AbstractCegarLoop]: === Iteration 139 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:33,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:33,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1461601320, now seen corresponding path program 36 times [2021-07-13 19:56:33,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:33,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795048090] [2021-07-13 19:56:33,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:33,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:33,516 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:33,516 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:33,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795048090] [2021-07-13 19:56:33,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795048090] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:33,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237593596] [2021-07-13 19:56:33,517 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:33,548 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:56:33,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:33,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:33,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:33,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:56:33,676 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:33,679 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:33,679 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:33,679 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:56:33,729 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:33,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237593596] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:33,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:33,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:56:33,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774010154] [2021-07-13 19:56:33,729 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:56:33,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:33,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:56:33,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:56:33,730 INFO L87 Difference]: Start difference. First operand 1600 states and 5605 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:35,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:35,526 INFO L93 Difference]: Finished difference Result 2345 states and 8015 transitions. [2021-07-13 19:56:35,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-07-13 19:56:35,526 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:35,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:35,530 INFO L225 Difference]: With dead ends: 2345 [2021-07-13 19:56:35,530 INFO L226 Difference]: Without dead ends: 2336 [2021-07-13 19:56:35,531 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 1441.0ms TimeCoverageRelationStatistics Valid=386, Invalid=2266, Unknown=0, NotChecked=0, Total=2652 [2021-07-13 19:56:35,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2336 states. [2021-07-13 19:56:35,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2336 to 1608. [2021-07-13 19:56:35,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1608 states, 1607 states have (on average 3.5003111387678905) internal successors, (5625), 1607 states have internal predecessors, (5625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:35,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1608 states to 1608 states and 5625 transitions. [2021-07-13 19:56:35,554 INFO L78 Accepts]: Start accepts. Automaton has 1608 states and 5625 transitions. Word has length 24 [2021-07-13 19:56:35,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:35,554 INFO L482 AbstractCegarLoop]: Abstraction has 1608 states and 5625 transitions. [2021-07-13 19:56:35,554 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:35,554 INFO L276 IsEmpty]: Start isEmpty. Operand 1608 states and 5625 transitions. [2021-07-13 19:56:35,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:35,556 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:35,556 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:35,757 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable215 [2021-07-13 19:56:35,757 INFO L430 AbstractCegarLoop]: === Iteration 140 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:35,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:35,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1999627536, now seen corresponding path program 37 times [2021-07-13 19:56:35,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:35,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349193548] [2021-07-13 19:56:35,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:35,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:35,941 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:35,941 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:35,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349193548] [2021-07-13 19:56:35,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349193548] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:35,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898648013] [2021-07-13 19:56:35,942 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 129 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 129 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:35,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:35,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:35,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:36,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:56:36,117 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:36,121 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:36,121 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:36,121 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:56:36,171 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:36,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898648013] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:36,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:36,172 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:56:36,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078082613] [2021-07-13 19:56:36,172 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:56:36,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:36,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:56:36,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:56:36,172 INFO L87 Difference]: Start difference. First operand 1608 states and 5625 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:37,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:37,599 INFO L93 Difference]: Finished difference Result 2356 states and 8045 transitions. [2021-07-13 19:56:37,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:56:37,600 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:37,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:37,604 INFO L225 Difference]: With dead ends: 2356 [2021-07-13 19:56:37,604 INFO L226 Difference]: Without dead ends: 2346 [2021-07-13 19:56:37,604 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 1245.4ms TimeCoverageRelationStatistics Valid=303, Invalid=1767, Unknown=0, NotChecked=0, Total=2070 [2021-07-13 19:56:37,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2346 states. [2021-07-13 19:56:37,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2346 to 1603. [2021-07-13 19:56:37,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1603 states, 1602 states have (on average 3.5037453183520597) internal successors, (5613), 1602 states have internal predecessors, (5613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:37,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1603 states to 1603 states and 5613 transitions. [2021-07-13 19:56:37,638 INFO L78 Accepts]: Start accepts. Automaton has 1603 states and 5613 transitions. Word has length 24 [2021-07-13 19:56:37,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:37,638 INFO L482 AbstractCegarLoop]: Abstraction has 1603 states and 5613 transitions. [2021-07-13 19:56:37,638 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:37,638 INFO L276 IsEmpty]: Start isEmpty. Operand 1603 states and 5613 transitions. [2021-07-13 19:56:37,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:37,640 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:37,640 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:37,842 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 129 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable216 [2021-07-13 19:56:37,842 INFO L430 AbstractCegarLoop]: === Iteration 141 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:37,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:37,842 INFO L82 PathProgramCache]: Analyzing trace with hash 2121589456, now seen corresponding path program 38 times [2021-07-13 19:56:37,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:37,843 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284512850] [2021-07-13 19:56:37,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:37,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:38,050 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:38,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:38,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284512850] [2021-07-13 19:56:38,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284512850] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:38,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493277949] [2021-07-13 19:56:38,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:38,079 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:56:38,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:38,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:56:38,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:38,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:38,333 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:56:38,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:38,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:38,340 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:38,341 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:38,341 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:56:38,383 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:38,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493277949] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:38,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:38,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:56:38,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998723546] [2021-07-13 19:56:38,384 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:38,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:38,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:38,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:38,385 INFO L87 Difference]: Start difference. First operand 1603 states and 5613 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:39,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:39,596 INFO L93 Difference]: Finished difference Result 2139 states and 7300 transitions. [2021-07-13 19:56:39,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 19:56:39,596 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:39,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:39,600 INFO L225 Difference]: With dead ends: 2139 [2021-07-13 19:56:39,600 INFO L226 Difference]: Without dead ends: 2130 [2021-07-13 19:56:39,601 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 1056.4ms TimeCoverageRelationStatistics Valid=253, Invalid=1553, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:56:39,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2130 states. [2021-07-13 19:56:39,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2130 to 1605. [2021-07-13 19:56:39,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1605 states, 1604 states have (on average 3.5037406483790523) internal successors, (5620), 1604 states have internal predecessors, (5620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:39,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1605 states to 1605 states and 5620 transitions. [2021-07-13 19:56:39,623 INFO L78 Accepts]: Start accepts. Automaton has 1605 states and 5620 transitions. Word has length 24 [2021-07-13 19:56:39,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:39,624 INFO L482 AbstractCegarLoop]: Abstraction has 1605 states and 5620 transitions. [2021-07-13 19:56:39,624 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:39,624 INFO L276 IsEmpty]: Start isEmpty. Operand 1605 states and 5620 transitions. [2021-07-13 19:56:39,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:39,626 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:39,626 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:39,834 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable217 [2021-07-13 19:56:39,834 INFO L430 AbstractCegarLoop]: === Iteration 142 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:39,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:39,835 INFO L82 PathProgramCache]: Analyzing trace with hash 1912052076, now seen corresponding path program 39 times [2021-07-13 19:56:39,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:39,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606602314] [2021-07-13 19:56:39,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:39,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:40,061 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:40,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:40,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606602314] [2021-07-13 19:56:40,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606602314] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:40,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997796303] [2021-07-13 19:56:40,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 131 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 131 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:40,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:56:40,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:40,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:40,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:40,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:40,246 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:40,247 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:40,248 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:40,248 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:56:40,279 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:40,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997796303] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:40,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:40,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:56:40,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922985845] [2021-07-13 19:56:40,279 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:56:40,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:40,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:56:40,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:56:40,280 INFO L87 Difference]: Start difference. First operand 1605 states and 5620 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:41,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:41,745 INFO L93 Difference]: Finished difference Result 2163 states and 7368 transitions. [2021-07-13 19:56:41,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:56:41,746 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:41,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:41,750 INFO L225 Difference]: With dead ends: 2163 [2021-07-13 19:56:41,750 INFO L226 Difference]: Without dead ends: 2144 [2021-07-13 19:56:41,751 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 1138.8ms TimeCoverageRelationStatistics Valid=294, Invalid=1686, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 19:56:41,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2144 states. [2021-07-13 19:56:41,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2144 to 1610. [2021-07-13 19:56:41,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1610 states, 1609 states have (on average 3.5027967681789933) internal successors, (5636), 1609 states have internal predecessors, (5636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:41,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1610 states to 1610 states and 5636 transitions. [2021-07-13 19:56:41,774 INFO L78 Accepts]: Start accepts. Automaton has 1610 states and 5636 transitions. Word has length 24 [2021-07-13 19:56:41,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:41,774 INFO L482 AbstractCegarLoop]: Abstraction has 1610 states and 5636 transitions. [2021-07-13 19:56:41,774 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:41,774 INFO L276 IsEmpty]: Start isEmpty. Operand 1610 states and 5636 transitions. [2021-07-13 19:56:41,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:41,777 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:41,777 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:41,977 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable218,131 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:41,977 INFO L430 AbstractCegarLoop]: === Iteration 143 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:41,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:41,978 INFO L82 PathProgramCache]: Analyzing trace with hash -654243474, now seen corresponding path program 40 times [2021-07-13 19:56:41,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:41,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896259062] [2021-07-13 19:56:41,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:41,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:42,215 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:42,215 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:42,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896259062] [2021-07-13 19:56:42,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896259062] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:42,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478410746] [2021-07-13 19:56:42,216 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:42,242 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:56:42,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:42,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:42,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:42,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:42,399 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:42,400 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:42,401 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:42,401 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:56:42,430 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:42,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478410746] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:42,431 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:42,431 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:56:42,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032262190] [2021-07-13 19:56:42,431 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:56:42,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:42,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:56:42,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:56:42,431 INFO L87 Difference]: Start difference. First operand 1610 states and 5636 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:43,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:43,728 INFO L93 Difference]: Finished difference Result 2117 states and 7230 transitions. [2021-07-13 19:56:43,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:56:43,728 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:43,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:43,732 INFO L225 Difference]: With dead ends: 2117 [2021-07-13 19:56:43,732 INFO L226 Difference]: Without dead ends: 2098 [2021-07-13 19:56:43,733 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1097.9ms TimeCoverageRelationStatistics Valid=287, Invalid=1605, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 19:56:43,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2098 states. [2021-07-13 19:56:43,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2098 to 1607. [2021-07-13 19:56:43,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1607 states, 1606 states have (on average 3.5043586550435863) internal successors, (5628), 1606 states have internal predecessors, (5628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:43,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1607 states to 1607 states and 5628 transitions. [2021-07-13 19:56:43,755 INFO L78 Accepts]: Start accepts. Automaton has 1607 states and 5628 transitions. Word has length 24 [2021-07-13 19:56:43,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:43,755 INFO L482 AbstractCegarLoop]: Abstraction has 1607 states and 5628 transitions. [2021-07-13 19:56:43,755 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:43,755 INFO L276 IsEmpty]: Start isEmpty. Operand 1607 states and 5628 transitions. [2021-07-13 19:56:43,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:43,758 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:43,758 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:43,958 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable219,132 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:43,958 INFO L430 AbstractCegarLoop]: === Iteration 144 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:43,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:43,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1682393334, now seen corresponding path program 41 times [2021-07-13 19:56:43,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:43,959 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34926359] [2021-07-13 19:56:43,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:43,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:44,149 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:44,149 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:44,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34926359] [2021-07-13 19:56:44,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34926359] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:44,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121995218] [2021-07-13 19:56:44,150 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 133 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 133 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:44,177 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:56:44,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:44,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:44,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:44,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:56:44,302 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:44,305 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:44,305 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:44,305 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:56:44,353 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:44,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121995218] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:44,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:44,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:56:44,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940807106] [2021-07-13 19:56:44,354 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:56:44,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:44,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:56:44,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:56:44,354 INFO L87 Difference]: Start difference. First operand 1607 states and 5628 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:45,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:45,343 INFO L93 Difference]: Finished difference Result 2083 states and 7122 transitions. [2021-07-13 19:56:45,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:56:45,343 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:45,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:45,347 INFO L225 Difference]: With dead ends: 2083 [2021-07-13 19:56:45,347 INFO L226 Difference]: Without dead ends: 2074 [2021-07-13 19:56:45,347 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 879.2ms TimeCoverageRelationStatistics Valid=252, Invalid=1230, Unknown=0, NotChecked=0, Total=1482 [2021-07-13 19:56:45,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2074 states. [2021-07-13 19:56:45,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2074 to 1616. [2021-07-13 19:56:45,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1616 states, 1615 states have (on average 3.502167182662539) internal successors, (5656), 1615 states have internal predecessors, (5656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:45,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1616 states to 1616 states and 5656 transitions. [2021-07-13 19:56:45,369 INFO L78 Accepts]: Start accepts. Automaton has 1616 states and 5656 transitions. Word has length 24 [2021-07-13 19:56:45,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:45,369 INFO L482 AbstractCegarLoop]: Abstraction has 1616 states and 5656 transitions. [2021-07-13 19:56:45,369 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:45,369 INFO L276 IsEmpty]: Start isEmpty. Operand 1616 states and 5656 transitions. [2021-07-13 19:56:45,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:45,372 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:45,372 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:45,572 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 133 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable220 [2021-07-13 19:56:45,572 INFO L430 AbstractCegarLoop]: === Iteration 145 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:45,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:45,572 INFO L82 PathProgramCache]: Analyzing trace with hash -1358807156, now seen corresponding path program 42 times [2021-07-13 19:56:45,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:45,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543253291] [2021-07-13 19:56:45,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:45,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:45,769 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:45,769 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:45,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543253291] [2021-07-13 19:56:45,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [543253291] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:45,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598524677] [2021-07-13 19:56:45,770 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:45,798 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:56:45,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:45,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 29 conjunts are in the unsatisfiable core [2021-07-13 19:56:45,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:45,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:45,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:45,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:45,968 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:45,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 43 [2021-07-13 19:56:45,970 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:45,984 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:45,992 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:45,992 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:88 [2021-07-13 19:56:46,105 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:46,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598524677] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:46,105 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:46,105 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:56:46,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521445691] [2021-07-13 19:56:46,106 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:46,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:46,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:46,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:46,106 INFO L87 Difference]: Start difference. First operand 1616 states and 5656 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:47,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:47,555 INFO L93 Difference]: Finished difference Result 2092 states and 7134 transitions. [2021-07-13 19:56:47,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 19:56:47,556 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:47,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:47,560 INFO L225 Difference]: With dead ends: 2092 [2021-07-13 19:56:47,560 INFO L226 Difference]: Without dead ends: 2083 [2021-07-13 19:56:47,560 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 1333.1ms TimeCoverageRelationStatistics Valid=419, Invalid=1933, Unknown=0, NotChecked=0, Total=2352 [2021-07-13 19:56:47,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-07-13 19:56:47,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 1615. [2021-07-13 19:56:47,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1615 states, 1614 states have (on average 3.502478314745973) internal successors, (5653), 1614 states have internal predecessors, (5653), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:47,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1615 states to 1615 states and 5653 transitions. [2021-07-13 19:56:47,584 INFO L78 Accepts]: Start accepts. Automaton has 1615 states and 5653 transitions. Word has length 24 [2021-07-13 19:56:47,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:47,584 INFO L482 AbstractCegarLoop]: Abstraction has 1615 states and 5653 transitions. [2021-07-13 19:56:47,584 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:47,584 INFO L276 IsEmpty]: Start isEmpty. Operand 1615 states and 5653 transitions. [2021-07-13 19:56:47,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:47,586 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:47,586 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:47,786 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable221 [2021-07-13 19:56:47,787 INFO L430 AbstractCegarLoop]: === Iteration 146 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:47,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:47,787 INFO L82 PathProgramCache]: Analyzing trace with hash 326936966, now seen corresponding path program 43 times [2021-07-13 19:56:47,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:47,787 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845321698] [2021-07-13 19:56:47,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:47,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:47,965 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:47,965 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:47,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845321698] [2021-07-13 19:56:47,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845321698] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:47,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107271934] [2021-07-13 19:56:47,965 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 135 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 135 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:47,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:47,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:47,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:48,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:56:48,144 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:48,147 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:48,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:48,147 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:56:48,192 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:48,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107271934] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:48,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:48,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:56:48,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893392831] [2021-07-13 19:56:48,193 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:56:48,193 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:48,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:56:48,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:56:48,193 INFO L87 Difference]: Start difference. First operand 1615 states and 5653 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:49,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:49,158 INFO L93 Difference]: Finished difference Result 2032 states and 6957 transitions. [2021-07-13 19:56:49,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:56:49,158 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:49,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:49,162 INFO L225 Difference]: With dead ends: 2032 [2021-07-13 19:56:49,162 INFO L226 Difference]: Without dead ends: 2021 [2021-07-13 19:56:49,162 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 853.4ms TimeCoverageRelationStatistics Valid=204, Invalid=1128, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:56:49,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2021 states. [2021-07-13 19:56:49,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2021 to 1605. [2021-07-13 19:56:49,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1605 states, 1604 states have (on average 3.5031172069825436) internal successors, (5619), 1604 states have internal predecessors, (5619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:49,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1605 states to 1605 states and 5619 transitions. [2021-07-13 19:56:49,186 INFO L78 Accepts]: Start accepts. Automaton has 1605 states and 5619 transitions. Word has length 24 [2021-07-13 19:56:49,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:49,186 INFO L482 AbstractCegarLoop]: Abstraction has 1605 states and 5619 transitions. [2021-07-13 19:56:49,186 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:49,186 INFO L276 IsEmpty]: Start isEmpty. Operand 1605 states and 5619 transitions. [2021-07-13 19:56:49,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:49,189 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:49,189 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:49,389 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable227,135 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:49,389 INFO L430 AbstractCegarLoop]: === Iteration 147 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:49,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:49,389 INFO L82 PathProgramCache]: Analyzing trace with hash 409417856, now seen corresponding path program 44 times [2021-07-13 19:56:49,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:49,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593571469] [2021-07-13 19:56:49,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:49,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:49,583 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:49,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:49,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593571469] [2021-07-13 19:56:49,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593571469] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:49,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844281993] [2021-07-13 19:56:49,584 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 136 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 136 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:49,620 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:56:49,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:49,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:56:49,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:49,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:49,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:56:49,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:49,847 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:49,852 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:49,853 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:49,853 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:56:49,891 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:49,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844281993] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:49,891 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:49,891 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:56:49,891 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4424737] [2021-07-13 19:56:49,892 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:49,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:49,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:49,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:49,892 INFO L87 Difference]: Start difference. First operand 1605 states and 5619 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:51,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:51,063 INFO L93 Difference]: Finished difference Result 2169 states and 7374 transitions. [2021-07-13 19:56:51,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:56:51,063 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:51,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:51,067 INFO L225 Difference]: With dead ends: 2169 [2021-07-13 19:56:51,067 INFO L226 Difference]: Without dead ends: 2160 [2021-07-13 19:56:51,067 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 965.3ms TimeCoverageRelationStatistics Valid=239, Invalid=1401, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 19:56:51,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2160 states. [2021-07-13 19:56:51,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2160 to 1607. [2021-07-13 19:56:51,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1607 states, 1606 states have (on average 3.5043586550435863) internal successors, (5628), 1606 states have internal predecessors, (5628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:51,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1607 states to 1607 states and 5628 transitions. [2021-07-13 19:56:51,090 INFO L78 Accepts]: Start accepts. Automaton has 1607 states and 5628 transitions. Word has length 24 [2021-07-13 19:56:51,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:51,090 INFO L482 AbstractCegarLoop]: Abstraction has 1607 states and 5628 transitions. [2021-07-13 19:56:51,090 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:51,090 INFO L276 IsEmpty]: Start isEmpty. Operand 1607 states and 5628 transitions. [2021-07-13 19:56:51,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:51,092 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:51,092 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:51,292 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable228 [2021-07-13 19:56:51,293 INFO L430 AbstractCegarLoop]: === Iteration 148 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:51,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:51,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1098664202, now seen corresponding path program 45 times [2021-07-13 19:56:51,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:51,293 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758383213] [2021-07-13 19:56:51,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:51,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:51,512 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:51,512 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:51,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758383213] [2021-07-13 19:56:51,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758383213] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:51,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768864129] [2021-07-13 19:56:51,513 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 137 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 137 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:51,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:56:51,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:51,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:56:51,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:51,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:56:51,756 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:56:51,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:51,757 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:51,761 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:51,762 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:51,762 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:56:51,793 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:51,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768864129] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:51,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:51,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:56:51,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520887147] [2021-07-13 19:56:51,794 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:56:51,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:51,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:56:51,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:56:51,794 INFO L87 Difference]: Start difference. First operand 1607 states and 5628 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:52,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:52,907 INFO L93 Difference]: Finished difference Result 2173 states and 7379 transitions. [2021-07-13 19:56:52,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:56:52,907 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:52,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:52,911 INFO L225 Difference]: With dead ends: 2173 [2021-07-13 19:56:52,911 INFO L226 Difference]: Without dead ends: 2163 [2021-07-13 19:56:52,911 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 973.0ms TimeCoverageRelationStatistics Valid=228, Invalid=1332, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 19:56:52,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2163 states. [2021-07-13 19:56:52,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2163 to 1610. [2021-07-13 19:56:52,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1610 states, 1609 states have (on average 3.5027967681789933) internal successors, (5636), 1609 states have internal predecessors, (5636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:52,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1610 states to 1610 states and 5636 transitions. [2021-07-13 19:56:52,934 INFO L78 Accepts]: Start accepts. Automaton has 1610 states and 5636 transitions. Word has length 24 [2021-07-13 19:56:52,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:52,934 INFO L482 AbstractCegarLoop]: Abstraction has 1610 states and 5636 transitions. [2021-07-13 19:56:52,934 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:52,934 INFO L276 IsEmpty]: Start isEmpty. Operand 1610 states and 5636 transitions. [2021-07-13 19:56:52,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:52,936 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:52,936 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:53,137 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable229,137 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:53,137 INFO L430 AbstractCegarLoop]: === Iteration 149 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:53,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:53,137 INFO L82 PathProgramCache]: Analyzing trace with hash 837579310, now seen corresponding path program 46 times [2021-07-13 19:56:53,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:53,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204553176] [2021-07-13 19:56:53,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:53,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:53,362 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:53,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:53,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204553176] [2021-07-13 19:56:53,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204553176] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:53,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619649754] [2021-07-13 19:56:53,362 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 138 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 138 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:53,389 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:56:53,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:53,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:53,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:53,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:56:53,555 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:53,557 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:53,557 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:53,557 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 19:56:53,587 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:53,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619649754] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:53,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:53,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:56:53,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52121346] [2021-07-13 19:56:53,588 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:56:53,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:53,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:56:53,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:56:53,588 INFO L87 Difference]: Start difference. First operand 1610 states and 5636 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:54,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:54,788 INFO L93 Difference]: Finished difference Result 2159 states and 7353 transitions. [2021-07-13 19:56:54,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:56:54,788 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:54,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:54,793 INFO L225 Difference]: With dead ends: 2159 [2021-07-13 19:56:54,793 INFO L226 Difference]: Without dead ends: 2149 [2021-07-13 19:56:54,793 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 1008.4ms TimeCoverageRelationStatistics Valid=254, Invalid=1386, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 19:56:54,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2021-07-13 19:56:54,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 1608. [2021-07-13 19:56:54,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1608 states, 1607 states have (on average 3.5046670815183574) internal successors, (5632), 1607 states have internal predecessors, (5632), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:54,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1608 states to 1608 states and 5632 transitions. [2021-07-13 19:56:54,824 INFO L78 Accepts]: Start accepts. Automaton has 1608 states and 5632 transitions. Word has length 24 [2021-07-13 19:56:54,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:54,824 INFO L482 AbstractCegarLoop]: Abstraction has 1608 states and 5632 transitions. [2021-07-13 19:56:54,824 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:54,824 INFO L276 IsEmpty]: Start isEmpty. Operand 1608 states and 5632 transitions. [2021-07-13 19:56:54,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:54,826 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:54,826 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:55,027 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable230 [2021-07-13 19:56:55,027 INFO L430 AbstractCegarLoop]: === Iteration 150 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:55,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:55,027 INFO L82 PathProgramCache]: Analyzing trace with hash 661037878, now seen corresponding path program 47 times [2021-07-13 19:56:55,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:55,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957150208] [2021-07-13 19:56:55,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:55,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:55,221 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:55,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:55,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957150208] [2021-07-13 19:56:55,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957150208] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:55,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357409261] [2021-07-13 19:56:55,221 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 139 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 139 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:55,248 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:56:55,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:55,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:55,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:55,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:56:55,373 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:55,376 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:55,376 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:55,376 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:56:55,426 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:55,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357409261] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:55,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:55,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:56:55,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253336155] [2021-07-13 19:56:55,426 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:56:55,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:55,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:56:55,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:56:55,427 INFO L87 Difference]: Start difference. First operand 1608 states and 5632 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:56,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:56,591 INFO L93 Difference]: Finished difference Result 2113 states and 7205 transitions. [2021-07-13 19:56:56,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 19:56:56,591 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:56,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:56,595 INFO L225 Difference]: With dead ends: 2113 [2021-07-13 19:56:56,595 INFO L226 Difference]: Without dead ends: 2104 [2021-07-13 19:56:56,595 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 974.0ms TimeCoverageRelationStatistics Valid=270, Invalid=1452, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:56:56,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2104 states. [2021-07-13 19:56:56,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2104 to 1614. [2021-07-13 19:56:56,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1614 states, 1613 states have (on average 3.5015499070055798) internal successors, (5648), 1613 states have internal predecessors, (5648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:56,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1614 states to 1614 states and 5648 transitions. [2021-07-13 19:56:56,618 INFO L78 Accepts]: Start accepts. Automaton has 1614 states and 5648 transitions. Word has length 24 [2021-07-13 19:56:56,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:56,618 INFO L482 AbstractCegarLoop]: Abstraction has 1614 states and 5648 transitions. [2021-07-13 19:56:56,618 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:56,618 INFO L276 IsEmpty]: Start isEmpty. Operand 1614 states and 5648 transitions. [2021-07-13 19:56:56,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:56,620 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:56,620 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:56,821 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable231,139 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:56,821 INFO L430 AbstractCegarLoop]: === Iteration 151 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:56,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:56,821 INFO L82 PathProgramCache]: Analyzing trace with hash -172700562, now seen corresponding path program 48 times [2021-07-13 19:56:56,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:56,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744108803] [2021-07-13 19:56:56,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:56,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:57,006 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:57,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:57,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744108803] [2021-07-13 19:56:57,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744108803] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:57,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655708642] [2021-07-13 19:56:57,006 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 140 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 140 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:57,034 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:56:57,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:56:57,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:56:57,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:57,173 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:57,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:56:57,175 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:57,184 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:57,185 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:57,185 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:56:57,294 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:57,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655708642] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:57,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:57,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:56:57,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327526960] [2021-07-13 19:56:57,295 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:56:57,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:57,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:56:57,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:56:57,296 INFO L87 Difference]: Start difference. First operand 1614 states and 5648 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:58,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:56:58,985 INFO L93 Difference]: Finished difference Result 2241 states and 7546 transitions. [2021-07-13 19:56:58,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:56:58,985 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:56:58,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:56:58,989 INFO L225 Difference]: With dead ends: 2241 [2021-07-13 19:56:58,990 INFO L226 Difference]: Without dead ends: 2222 [2021-07-13 19:56:58,990 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 502 ImplicationChecksByTransitivity, 1414.3ms TimeCoverageRelationStatistics Valid=348, Invalid=1722, Unknown=0, NotChecked=0, Total=2070 [2021-07-13 19:56:58,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2222 states. [2021-07-13 19:56:59,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2222 to 1621. [2021-07-13 19:56:59,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1621 states, 1620 states have (on average 3.504938271604938) internal successors, (5678), 1620 states have internal predecessors, (5678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:59,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1621 states to 1621 states and 5678 transitions. [2021-07-13 19:56:59,015 INFO L78 Accepts]: Start accepts. Automaton has 1621 states and 5678 transitions. Word has length 24 [2021-07-13 19:56:59,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:56:59,015 INFO L482 AbstractCegarLoop]: Abstraction has 1621 states and 5678 transitions. [2021-07-13 19:56:59,015 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:56:59,015 INFO L276 IsEmpty]: Start isEmpty. Operand 1621 states and 5678 transitions. [2021-07-13 19:56:59,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:56:59,017 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:56:59,018 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:56:59,218 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 140 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable232 [2021-07-13 19:56:59,218 INFO L430 AbstractCegarLoop]: === Iteration 152 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:56:59,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:56:59,218 INFO L82 PathProgramCache]: Analyzing trace with hash 609133238, now seen corresponding path program 49 times [2021-07-13 19:56:59,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:56:59,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682297531] [2021-07-13 19:56:59,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:56:59,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:59,397 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:59,398 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:56:59,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682297531] [2021-07-13 19:56:59,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682297531] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:59,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384539135] [2021-07-13 19:56:59,398 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 141 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 141 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:56:59,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:56:59,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:56:59,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:56:59,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:56:59,554 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:56:59,557 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:56:59,557 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:56:59,557 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:56:59,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:56:59,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384539135] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:56:59,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:56:59,605 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:56:59,605 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440292416] [2021-07-13 19:56:59,605 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:56:59,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:56:59,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:56:59,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:56:59,606 INFO L87 Difference]: Start difference. First operand 1621 states and 5678 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:00,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:00,640 INFO L93 Difference]: Finished difference Result 2080 states and 7089 transitions. [2021-07-13 19:57:00,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:57:00,640 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:00,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:00,644 INFO L225 Difference]: With dead ends: 2080 [2021-07-13 19:57:00,644 INFO L226 Difference]: Without dead ends: 2070 [2021-07-13 19:57:00,644 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 877.1ms TimeCoverageRelationStatistics Valid=199, Invalid=1133, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:57:00,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2070 states. [2021-07-13 19:57:00,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2070 to 1615. [2021-07-13 19:57:00,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1615 states, 1614 states have (on average 3.507434944237918) internal successors, (5661), 1614 states have internal predecessors, (5661), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:00,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1615 states to 1615 states and 5661 transitions. [2021-07-13 19:57:00,668 INFO L78 Accepts]: Start accepts. Automaton has 1615 states and 5661 transitions. Word has length 24 [2021-07-13 19:57:00,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:00,668 INFO L482 AbstractCegarLoop]: Abstraction has 1615 states and 5661 transitions. [2021-07-13 19:57:00,668 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:00,668 INFO L276 IsEmpty]: Start isEmpty. Operand 1615 states and 5661 transitions. [2021-07-13 19:57:00,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:00,670 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:00,670 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:00,871 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 141 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable235 [2021-07-13 19:57:00,871 INFO L430 AbstractCegarLoop]: === Iteration 153 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:00,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:00,871 INFO L82 PathProgramCache]: Analyzing trace with hash -451513034, now seen corresponding path program 50 times [2021-07-13 19:57:00,871 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:00,871 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195146278] [2021-07-13 19:57:00,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:00,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:01,093 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:01,093 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:01,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195146278] [2021-07-13 19:57:01,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [195146278] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:01,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539568818] [2021-07-13 19:57:01,093 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 142 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 142 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:01,120 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:57:01,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:01,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 19:57:01,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:01,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:01,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:01,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:01,369 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:01,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 38 [2021-07-13 19:57:01,372 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:57:01,392 INFO L628 ElimStorePlain]: treesize reduction 16, result has 61.0 percent of original size [2021-07-13 19:57:01,394 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:01,394 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:33 [2021-07-13 19:57:01,491 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:01,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539568818] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:01,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:01,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:57:01,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616783320] [2021-07-13 19:57:01,492 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:57:01,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:01,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:57:01,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:57:01,492 INFO L87 Difference]: Start difference. First operand 1615 states and 5661 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:02,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:02,855 INFO L93 Difference]: Finished difference Result 2143 states and 7250 transitions. [2021-07-13 19:57:02,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:57:02,855 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:02,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:02,859 INFO L225 Difference]: With dead ends: 2143 [2021-07-13 19:57:02,859 INFO L226 Difference]: Without dead ends: 2116 [2021-07-13 19:57:02,859 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 1237.5ms TimeCoverageRelationStatistics Valid=268, Invalid=1712, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 19:57:02,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2116 states. [2021-07-13 19:57:02,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2116 to 1621. [2021-07-13 19:57:02,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1621 states, 1620 states have (on average 3.50679012345679) internal successors, (5681), 1620 states have internal predecessors, (5681), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:02,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1621 states to 1621 states and 5681 transitions. [2021-07-13 19:57:02,882 INFO L78 Accepts]: Start accepts. Automaton has 1621 states and 5681 transitions. Word has length 24 [2021-07-13 19:57:02,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:02,882 INFO L482 AbstractCegarLoop]: Abstraction has 1621 states and 5681 transitions. [2021-07-13 19:57:02,882 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:02,882 INFO L276 IsEmpty]: Start isEmpty. Operand 1621 states and 5681 transitions. [2021-07-13 19:57:02,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:02,885 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:02,885 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:03,085 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 142 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable236 [2021-07-13 19:57:03,085 INFO L430 AbstractCegarLoop]: === Iteration 154 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:03,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:03,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1277158712, now seen corresponding path program 51 times [2021-07-13 19:57:03,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:03,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553096465] [2021-07-13 19:57:03,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:03,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:03,325 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:03,325 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:03,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553096465] [2021-07-13 19:57:03,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553096465] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:03,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923444095] [2021-07-13 19:57:03,326 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 143 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 143 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:03,365 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:57:03,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:03,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:57:03,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:03,540 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:03,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:57:03,542 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:03,551 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:03,551 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:03,552 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 19:57:03,618 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:03,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923444095] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:03,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:03,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:57:03,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877378928] [2021-07-13 19:57:03,619 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:57:03,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:03,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:57:03,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:57:03,619 INFO L87 Difference]: Start difference. First operand 1621 states and 5681 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:05,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:05,550 INFO L93 Difference]: Finished difference Result 2143 states and 7279 transitions. [2021-07-13 19:57:05,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:57:05,550 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:05,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:05,554 INFO L225 Difference]: With dead ends: 2143 [2021-07-13 19:57:05,554 INFO L226 Difference]: Without dead ends: 2124 [2021-07-13 19:57:05,555 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 1670.5ms TimeCoverageRelationStatistics Valid=440, Invalid=2212, Unknown=0, NotChecked=0, Total=2652 [2021-07-13 19:57:05,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2124 states. [2021-07-13 19:57:05,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2124 to 1623. [2021-07-13 19:57:05,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1623 states, 1622 states have (on average 3.5067817509247843) internal successors, (5688), 1622 states have internal predecessors, (5688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:05,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1623 states to 1623 states and 5688 transitions. [2021-07-13 19:57:05,578 INFO L78 Accepts]: Start accepts. Automaton has 1623 states and 5688 transitions. Word has length 24 [2021-07-13 19:57:05,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:05,578 INFO L482 AbstractCegarLoop]: Abstraction has 1623 states and 5688 transitions. [2021-07-13 19:57:05,578 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:05,578 INFO L276 IsEmpty]: Start isEmpty. Operand 1623 states and 5688 transitions. [2021-07-13 19:57:05,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:05,580 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:05,580 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:05,784 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 143 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable242 [2021-07-13 19:57:05,785 INFO L430 AbstractCegarLoop]: === Iteration 155 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:05,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:05,785 INFO L82 PathProgramCache]: Analyzing trace with hash 249008852, now seen corresponding path program 52 times [2021-07-13 19:57:05,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:05,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291254178] [2021-07-13 19:57:05,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:05,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:05,999 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:05,999 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:05,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291254178] [2021-07-13 19:57:05,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291254178] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:05,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163953505] [2021-07-13 19:57:05,999 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 144 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 144 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:06,026 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:57:06,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:06,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:06,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:06,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:06,150 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:06,152 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:06,153 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:06,153 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:57:06,199 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:06,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163953505] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:06,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:06,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:06,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26473286] [2021-07-13 19:57:06,200 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:06,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:06,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:06,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:06,200 INFO L87 Difference]: Start difference. First operand 1623 states and 5688 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:07,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:07,208 INFO L93 Difference]: Finished difference Result 2073 states and 7090 transitions. [2021-07-13 19:57:07,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:57:07,209 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:07,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:07,212 INFO L225 Difference]: With dead ends: 2073 [2021-07-13 19:57:07,212 INFO L226 Difference]: Without dead ends: 2063 [2021-07-13 19:57:07,212 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 910.4ms TimeCoverageRelationStatistics Valid=259, Invalid=1223, Unknown=0, NotChecked=0, Total=1482 [2021-07-13 19:57:07,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2063 states. [2021-07-13 19:57:07,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2063 to 1632. [2021-07-13 19:57:07,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1632 states, 1631 states have (on average 3.505824647455549) internal successors, (5718), 1631 states have internal predecessors, (5718), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:07,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1632 states to 1632 states and 5718 transitions. [2021-07-13 19:57:07,234 INFO L78 Accepts]: Start accepts. Automaton has 1632 states and 5718 transitions. Word has length 24 [2021-07-13 19:57:07,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:07,234 INFO L482 AbstractCegarLoop]: Abstraction has 1632 states and 5718 transitions. [2021-07-13 19:57:07,234 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:07,235 INFO L276 IsEmpty]: Start isEmpty. Operand 1632 states and 5718 transitions. [2021-07-13 19:57:07,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:07,237 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:07,237 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:07,440 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 144 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable245 [2021-07-13 19:57:07,441 INFO L430 AbstractCegarLoop]: === Iteration 156 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:07,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:07,441 INFO L82 PathProgramCache]: Analyzing trace with hash 572595030, now seen corresponding path program 53 times [2021-07-13 19:57:07,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:07,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908006601] [2021-07-13 19:57:07,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:07,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:07,635 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:07,635 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:07,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908006601] [2021-07-13 19:57:07,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908006601] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:07,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129889713] [2021-07-13 19:57:07,635 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 145 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 145 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:07,662 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:57:07,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:07,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:07,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:07,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:07,791 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:07,794 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:07,794 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:07,794 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:57:07,843 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:07,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1129889713] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:07,844 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:07,844 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:07,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032261957] [2021-07-13 19:57:07,844 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:07,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:07,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:07,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:07,845 INFO L87 Difference]: Start difference. First operand 1632 states and 5718 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:08,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:08,848 INFO L93 Difference]: Finished difference Result 2042 states and 7006 transitions. [2021-07-13 19:57:08,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:57:08,848 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:08,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:08,852 INFO L225 Difference]: With dead ends: 2042 [2021-07-13 19:57:08,852 INFO L226 Difference]: Without dead ends: 2029 [2021-07-13 19:57:08,852 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 868.5ms TimeCoverageRelationStatistics Valid=237, Invalid=1169, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 19:57:08,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2029 states. [2021-07-13 19:57:08,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2029 to 1624. [2021-07-13 19:57:08,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1624 states, 1623 states have (on average 3.507085643869378) internal successors, (5692), 1623 states have internal predecessors, (5692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:08,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1624 states to 1624 states and 5692 transitions. [2021-07-13 19:57:08,874 INFO L78 Accepts]: Start accepts. Automaton has 1624 states and 5692 transitions. Word has length 24 [2021-07-13 19:57:08,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:08,874 INFO L482 AbstractCegarLoop]: Abstraction has 1624 states and 5692 transitions. [2021-07-13 19:57:08,874 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:08,874 INFO L276 IsEmpty]: Start isEmpty. Operand 1624 states and 5692 transitions. [2021-07-13 19:57:08,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:08,877 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:08,877 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:09,077 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 145 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable246 [2021-07-13 19:57:09,077 INFO L430 AbstractCegarLoop]: === Iteration 157 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:09,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:09,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1571465606, now seen corresponding path program 54 times [2021-07-13 19:57:09,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:09,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899037485] [2021-07-13 19:57:09,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:09,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:09,312 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:09,312 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:09,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899037485] [2021-07-13 19:57:09,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899037485] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:09,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026489806] [2021-07-13 19:57:09,313 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 146 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 146 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:09,339 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:57:09,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:09,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:09,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:09,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:09,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:09,546 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:09,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 38 [2021-07-13 19:57:09,549 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:57:09,556 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:09,557 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:09,557 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:22 [2021-07-13 19:57:09,624 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:09,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026489806] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:09,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:09,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:57:09,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710107607] [2021-07-13 19:57:09,624 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:57:09,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:09,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:57:09,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:57:09,625 INFO L87 Difference]: Start difference. First operand 1624 states and 5692 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:10,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:10,666 INFO L93 Difference]: Finished difference Result 2123 states and 7198 transitions. [2021-07-13 19:57:10,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-13 19:57:10,667 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:10,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:10,671 INFO L225 Difference]: With dead ends: 2123 [2021-07-13 19:57:10,671 INFO L226 Difference]: Without dead ends: 2104 [2021-07-13 19:57:10,671 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 948.5ms TimeCoverageRelationStatistics Valid=246, Invalid=1476, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:57:10,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2104 states. [2021-07-13 19:57:10,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2104 to 1630. [2021-07-13 19:57:10,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1630 states, 1629 states have (on average 3.5058317986494782) internal successors, (5711), 1629 states have internal predecessors, (5711), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:10,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1630 states to 1630 states and 5711 transitions. [2021-07-13 19:57:10,696 INFO L78 Accepts]: Start accepts. Automaton has 1630 states and 5711 transitions. Word has length 24 [2021-07-13 19:57:10,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:10,696 INFO L482 AbstractCegarLoop]: Abstraction has 1630 states and 5711 transitions. [2021-07-13 19:57:10,696 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:10,696 INFO L276 IsEmpty]: Start isEmpty. Operand 1630 states and 5711 transitions. [2021-07-13 19:57:10,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:10,698 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:10,698 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:10,899 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable247,146 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:10,899 INFO L430 AbstractCegarLoop]: === Iteration 158 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:10,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:10,901 INFO L82 PathProgramCache]: Analyzing trace with hash -1459204208, now seen corresponding path program 55 times [2021-07-13 19:57:10,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:10,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752239884] [2021-07-13 19:57:10,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:10,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:11,140 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:11,140 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:11,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752239884] [2021-07-13 19:57:11,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752239884] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:11,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893894790] [2021-07-13 19:57:11,140 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 147 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 147 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:11,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:11,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:11,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:11,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:57:11,320 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:11,322 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:11,322 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:11,322 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 19:57:11,352 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:11,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893894790] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:11,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:11,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:57:11,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243168209] [2021-07-13 19:57:11,353 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:11,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:11,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:11,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:11,353 INFO L87 Difference]: Start difference. First operand 1630 states and 5711 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:12,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:12,591 INFO L93 Difference]: Finished difference Result 2123 states and 7240 transitions. [2021-07-13 19:57:12,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:57:12,592 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:12,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:12,595 INFO L225 Difference]: With dead ends: 2123 [2021-07-13 19:57:12,595 INFO L226 Difference]: Without dead ends: 2113 [2021-07-13 19:57:12,596 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 1026.8ms TimeCoverageRelationStatistics Valid=258, Invalid=1464, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:57:12,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2113 states. [2021-07-13 19:57:12,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2113 to 1629. [2021-07-13 19:57:12,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1629 states, 1628 states have (on average 3.5067567567567566) internal successors, (5709), 1628 states have internal predecessors, (5709), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:12,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1629 states to 1629 states and 5709 transitions. [2021-07-13 19:57:12,619 INFO L78 Accepts]: Start accepts. Automaton has 1629 states and 5709 transitions. Word has length 24 [2021-07-13 19:57:12,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:12,619 INFO L482 AbstractCegarLoop]: Abstraction has 1629 states and 5709 transitions. [2021-07-13 19:57:12,619 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:12,619 INFO L276 IsEmpty]: Start isEmpty. Operand 1629 states and 5709 transitions. [2021-07-13 19:57:12,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:12,621 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:12,621 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:12,821 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable251,147 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:12,822 INFO L430 AbstractCegarLoop]: === Iteration 159 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:12,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:12,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1635745640, now seen corresponding path program 56 times [2021-07-13 19:57:12,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:12,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578841552] [2021-07-13 19:57:12,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:12,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:13,045 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:13,045 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:13,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578841552] [2021-07-13 19:57:13,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578841552] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:13,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189665303] [2021-07-13 19:57:13,046 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 148 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 148 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:13,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:57:13,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:13,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:57:13,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:13,219 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:13,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:57:13,220 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:13,230 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:13,230 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:13,230 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:57:13,327 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:13,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189665303] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:13,327 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:13,327 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:57:13,327 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002215890] [2021-07-13 19:57:13,327 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:13,327 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:13,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:13,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:13,328 INFO L87 Difference]: Start difference. First operand 1629 states and 5709 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:15,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:15,103 INFO L93 Difference]: Finished difference Result 2214 states and 7495 transitions. [2021-07-13 19:57:15,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-07-13 19:57:15,103 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:15,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:15,107 INFO L225 Difference]: With dead ends: 2214 [2021-07-13 19:57:15,107 INFO L226 Difference]: Without dead ends: 2195 [2021-07-13 19:57:15,107 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 1586.3ms TimeCoverageRelationStatistics Valid=493, Invalid=2369, Unknown=0, NotChecked=0, Total=2862 [2021-07-13 19:57:15,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2195 states. [2021-07-13 19:57:15,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2195 to 1638. [2021-07-13 19:57:15,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1638 states, 1637 states have (on average 3.5070250458155163) internal successors, (5741), 1637 states have internal predecessors, (5741), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:15,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1638 states to 1638 states and 5741 transitions. [2021-07-13 19:57:15,130 INFO L78 Accepts]: Start accepts. Automaton has 1638 states and 5741 transitions. Word has length 24 [2021-07-13 19:57:15,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:15,130 INFO L482 AbstractCegarLoop]: Abstraction has 1638 states and 5741 transitions. [2021-07-13 19:57:15,130 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:15,131 INFO L276 IsEmpty]: Start isEmpty. Operand 1638 states and 5741 transitions. [2021-07-13 19:57:15,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:15,133 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:15,133 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:15,333 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable252,148 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:15,333 INFO L430 AbstractCegarLoop]: === Iteration 160 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:15,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:15,334 INFO L82 PathProgramCache]: Analyzing trace with hash 1825483216, now seen corresponding path program 57 times [2021-07-13 19:57:15,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:15,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092299587] [2021-07-13 19:57:15,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:15,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:15,518 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:15,518 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:15,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092299587] [2021-07-13 19:57:15,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092299587] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:15,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879790584] [2021-07-13 19:57:15,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 149 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 149 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:15,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:57:15,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:15,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:15,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:15,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:15,677 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:15,680 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:15,681 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:15,681 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:57:15,730 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:15,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879790584] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:15,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:15,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:15,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981393008] [2021-07-13 19:57:15,730 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:15,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:15,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:15,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:15,731 INFO L87 Difference]: Start difference. First operand 1638 states and 5741 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:16,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:16,775 INFO L93 Difference]: Finished difference Result 2105 states and 7183 transitions. [2021-07-13 19:57:16,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:57:16,775 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:16,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:16,779 INFO L225 Difference]: With dead ends: 2105 [2021-07-13 19:57:16,779 INFO L226 Difference]: Without dead ends: 2095 [2021-07-13 19:57:16,780 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 899.6ms TimeCoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2021-07-13 19:57:16,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2095 states. [2021-07-13 19:57:16,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2095 to 1636. [2021-07-13 19:57:16,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1636 states, 1635 states have (on average 3.507645259938838) internal successors, (5735), 1635 states have internal predecessors, (5735), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:16,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1636 states to 1636 states and 5735 transitions. [2021-07-13 19:57:16,812 INFO L78 Accepts]: Start accepts. Automaton has 1636 states and 5735 transitions. Word has length 24 [2021-07-13 19:57:16,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:16,813 INFO L482 AbstractCegarLoop]: Abstraction has 1636 states and 5735 transitions. [2021-07-13 19:57:16,813 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:16,813 INFO L276 IsEmpty]: Start isEmpty. Operand 1636 states and 5735 transitions. [2021-07-13 19:57:16,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:16,815 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:16,815 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:17,015 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 149 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable255 [2021-07-13 19:57:17,015 INFO L430 AbstractCegarLoop]: === Iteration 161 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:17,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:17,016 INFO L82 PathProgramCache]: Analyzing trace with hash 224079120, now seen corresponding path program 58 times [2021-07-13 19:57:17,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:17,016 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639176752] [2021-07-13 19:57:17,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:17,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:17,248 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:17,248 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:17,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639176752] [2021-07-13 19:57:17,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639176752] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:17,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450811300] [2021-07-13 19:57:17,248 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 150 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 150 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:17,275 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:57:17,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:17,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:17,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:17,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:57:17,446 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:17,448 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:17,448 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:17,448 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:57:17,486 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:17,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1450811300] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:17,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:17,487 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:57:17,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665778042] [2021-07-13 19:57:17,487 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:17,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:17,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:17,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:17,487 INFO L87 Difference]: Start difference. First operand 1636 states and 5735 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:18,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:18,627 INFO L93 Difference]: Finished difference Result 2128 states and 7250 transitions. [2021-07-13 19:57:18,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:57:18,627 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:18,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:18,631 INFO L225 Difference]: With dead ends: 2128 [2021-07-13 19:57:18,631 INFO L226 Difference]: Without dead ends: 2109 [2021-07-13 19:57:18,631 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 1000.2ms TimeCoverageRelationStatistics Valid=254, Invalid=1386, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 19:57:18,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2109 states. [2021-07-13 19:57:18,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2109 to 1643. [2021-07-13 19:57:18,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1643 states, 1642 states have (on average 3.509744214372716) internal successors, (5763), 1642 states have internal predecessors, (5763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:18,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1643 states to 1643 states and 5763 transitions. [2021-07-13 19:57:18,654 INFO L78 Accepts]: Start accepts. Automaton has 1643 states and 5763 transitions. Word has length 24 [2021-07-13 19:57:18,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:18,654 INFO L482 AbstractCegarLoop]: Abstraction has 1643 states and 5763 transitions. [2021-07-13 19:57:18,654 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:18,654 INFO L276 IsEmpty]: Start isEmpty. Operand 1643 states and 5763 transitions. [2021-07-13 19:57:18,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:18,656 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:18,657 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:18,857 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 150 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable256 [2021-07-13 19:57:18,857 INFO L430 AbstractCegarLoop]: === Iteration 162 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:18,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:18,857 INFO L82 PathProgramCache]: Analyzing trace with hash -804070740, now seen corresponding path program 59 times [2021-07-13 19:57:18,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:18,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129092486] [2021-07-13 19:57:18,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:18,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:19,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:19,037 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:19,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129092486] [2021-07-13 19:57:19,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129092486] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:19,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979345441] [2021-07-13 19:57:19,037 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 151 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 151 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:19,064 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:57:19,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:19,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:19,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:19,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:19,187 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:19,189 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:19,190 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:19,190 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:57:19,235 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:19,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979345441] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:19,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:19,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:19,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702379546] [2021-07-13 19:57:19,236 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:19,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:19,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:19,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:19,236 INFO L87 Difference]: Start difference. First operand 1643 states and 5763 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:20,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:20,146 INFO L93 Difference]: Finished difference Result 2129 states and 7275 transitions. [2021-07-13 19:57:20,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:57:20,146 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:20,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:20,150 INFO L225 Difference]: With dead ends: 2129 [2021-07-13 19:57:20,150 INFO L226 Difference]: Without dead ends: 2119 [2021-07-13 19:57:20,150 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 791.6ms TimeCoverageRelationStatistics Valid=242, Invalid=1164, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 19:57:20,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2021-07-13 19:57:20,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1651. [2021-07-13 19:57:20,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1651 states, 1650 states have (on average 3.5090909090909093) internal successors, (5790), 1650 states have internal predecessors, (5790), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:20,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1651 states to 1651 states and 5790 transitions. [2021-07-13 19:57:20,174 INFO L78 Accepts]: Start accepts. Automaton has 1651 states and 5790 transitions. Word has length 24 [2021-07-13 19:57:20,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:20,174 INFO L482 AbstractCegarLoop]: Abstraction has 1651 states and 5790 transitions. [2021-07-13 19:57:20,174 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:20,174 INFO L276 IsEmpty]: Start isEmpty. Operand 1651 states and 5790 transitions. [2021-07-13 19:57:20,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:20,177 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:20,177 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:20,377 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 151 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable257 [2021-07-13 19:57:20,377 INFO L430 AbstractCegarLoop]: === Iteration 163 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:20,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:20,377 INFO L82 PathProgramCache]: Analyzing trace with hash -480484562, now seen corresponding path program 60 times [2021-07-13 19:57:20,378 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:20,378 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985471123] [2021-07-13 19:57:20,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:20,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:20,561 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:20,561 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:20,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985471123] [2021-07-13 19:57:20,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985471123] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:20,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066182699] [2021-07-13 19:57:20,561 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 152 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 152 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:20,588 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:57:20,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:20,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:57:20,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:20,724 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:20,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:57:20,725 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:20,735 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:20,736 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:20,736 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:57:20,867 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:20,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066182699] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:20,868 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:20,868 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:57:20,868 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799084313] [2021-07-13 19:57:20,868 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:20,868 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:20,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:20,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:20,869 INFO L87 Difference]: Start difference. First operand 1651 states and 5790 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:22,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:22,018 INFO L93 Difference]: Finished difference Result 2134 states and 7234 transitions. [2021-07-13 19:57:22,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:57:22,018 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:22,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:22,022 INFO L225 Difference]: With dead ends: 2134 [2021-07-13 19:57:22,022 INFO L226 Difference]: Without dead ends: 2115 [2021-07-13 19:57:22,023 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 1053.3ms TimeCoverageRelationStatistics Valid=294, Invalid=1346, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 19:57:22,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2115 states. [2021-07-13 19:57:22,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2115 to 1650. [2021-07-13 19:57:22,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1650 states, 1649 states have (on average 3.5106124924196482) internal successors, (5789), 1649 states have internal predecessors, (5789), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:22,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1650 states to 1650 states and 5789 transitions. [2021-07-13 19:57:22,055 INFO L78 Accepts]: Start accepts. Automaton has 1650 states and 5789 transitions. Word has length 24 [2021-07-13 19:57:22,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:22,055 INFO L482 AbstractCegarLoop]: Abstraction has 1650 states and 5789 transitions. [2021-07-13 19:57:22,055 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:22,055 INFO L276 IsEmpty]: Start isEmpty. Operand 1650 states and 5789 transitions. [2021-07-13 19:57:22,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:22,057 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:22,057 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:22,258 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 152 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable258 [2021-07-13 19:57:22,259 INFO L430 AbstractCegarLoop]: === Iteration 164 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:22,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:22,259 INFO L82 PathProgramCache]: Analyzing trace with hash 1205259560, now seen corresponding path program 61 times [2021-07-13 19:57:22,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:22,259 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36563409] [2021-07-13 19:57:22,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:22,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:22,447 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:22,448 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:22,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36563409] [2021-07-13 19:57:22,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36563409] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:22,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221292501] [2021-07-13 19:57:22,448 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 153 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 153 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:22,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:22,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:22,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:22,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:22,599 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:22,602 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:22,603 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:22,603 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:57:22,645 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:22,646 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221292501] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:22,646 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:22,646 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:57:22,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992846177] [2021-07-13 19:57:22,646 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:57:22,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:22,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:57:22,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:57:22,646 INFO L87 Difference]: Start difference. First operand 1650 states and 5789 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:23,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:23,395 INFO L93 Difference]: Finished difference Result 2040 states and 6997 transitions. [2021-07-13 19:57:23,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-07-13 19:57:23,396 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:23,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:23,399 INFO L225 Difference]: With dead ends: 2040 [2021-07-13 19:57:23,399 INFO L226 Difference]: Without dead ends: 2027 [2021-07-13 19:57:23,399 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 726.8ms TimeCoverageRelationStatistics Valid=182, Invalid=940, Unknown=0, NotChecked=0, Total=1122 [2021-07-13 19:57:23,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2027 states. [2021-07-13 19:57:23,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2027 to 1645. [2021-07-13 19:57:23,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1645 states, 1644 states have (on average 3.5097323600973236) internal successors, (5770), 1644 states have internal predecessors, (5770), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:23,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1645 states to 1645 states and 5770 transitions. [2021-07-13 19:57:23,421 INFO L78 Accepts]: Start accepts. Automaton has 1645 states and 5770 transitions. Word has length 24 [2021-07-13 19:57:23,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:23,421 INFO L482 AbstractCegarLoop]: Abstraction has 1645 states and 5770 transitions. [2021-07-13 19:57:23,421 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:23,422 INFO L276 IsEmpty]: Start isEmpty. Operand 1645 states and 5770 transitions. [2021-07-13 19:57:23,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:23,424 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:23,424 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:23,624 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable261,153 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:23,624 INFO L430 AbstractCegarLoop]: === Iteration 165 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:23,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:23,624 INFO L82 PathProgramCache]: Analyzing trace with hash 843525824, now seen corresponding path program 62 times [2021-07-13 19:57:23,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:23,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76820296] [2021-07-13 19:57:23,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:23,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:23,849 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:23,849 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:23,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76820296] [2021-07-13 19:57:23,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76820296] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:23,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479603865] [2021-07-13 19:57:23,849 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 154 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 154 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:23,876 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:57:23,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:23,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 37 conjunts are in the unsatisfiable core [2021-07-13 19:57:23,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:24,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:24,067 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:57:24,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 12 [2021-07-13 19:57:24,069 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:24,080 INFO L628 ElimStorePlain]: treesize reduction 3, result has 85.0 percent of original size [2021-07-13 19:57:24,080 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:24,080 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:17 [2021-07-13 19:57:24,135 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:24,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479603865] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:24,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:24,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:57:24,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835910023] [2021-07-13 19:57:24,136 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:57:24,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:24,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:57:24,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:57:24,136 INFO L87 Difference]: Start difference. First operand 1645 states and 5770 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:24,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:24,801 INFO L93 Difference]: Finished difference Result 2123 states and 7208 transitions. [2021-07-13 19:57:24,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:57:24,801 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:24,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:24,805 INFO L225 Difference]: With dead ends: 2123 [2021-07-13 19:57:24,805 INFO L226 Difference]: Without dead ends: 2071 [2021-07-13 19:57:24,805 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 594.0ms TimeCoverageRelationStatistics Valid=196, Invalid=926, Unknown=0, NotChecked=0, Total=1122 [2021-07-13 19:57:24,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2071 states. [2021-07-13 19:57:24,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2071 to 1648. [2021-07-13 19:57:24,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1648 states, 1647 states have (on average 3.5088038858530664) internal successors, (5779), 1647 states have internal predecessors, (5779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:24,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1648 states to 1648 states and 5779 transitions. [2021-07-13 19:57:24,827 INFO L78 Accepts]: Start accepts. Automaton has 1648 states and 5779 transitions. Word has length 24 [2021-07-13 19:57:24,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:24,827 INFO L482 AbstractCegarLoop]: Abstraction has 1648 states and 5779 transitions. [2021-07-13 19:57:24,827 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:24,828 INFO L276 IsEmpty]: Start isEmpty. Operand 1648 states and 5779 transitions. [2021-07-13 19:57:24,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:24,830 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:24,830 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:25,030 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable262,154 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:25,030 INFO L430 AbstractCegarLoop]: === Iteration 166 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:25,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:25,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1060950710, now seen corresponding path program 63 times [2021-07-13 19:57:25,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:25,031 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090073741] [2021-07-13 19:57:25,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:25,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:25,242 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:25,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:25,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090073741] [2021-07-13 19:57:25,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090073741] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:25,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439382994] [2021-07-13 19:57:25,243 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 155 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 155 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:25,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:57:25,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:25,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 35 conjunts are in the unsatisfiable core [2021-07-13 19:57:25,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:25,472 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:25,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 37 [2021-07-13 19:57:25,474 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:25,491 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:25,492 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:25,492 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:37 [2021-07-13 19:57:25,708 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:25,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439382994] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:25,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:25,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:57:25,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770271049] [2021-07-13 19:57:25,709 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:57:25,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:25,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:57:25,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:57:25,709 INFO L87 Difference]: Start difference. First operand 1648 states and 5779 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:26,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:26,838 INFO L93 Difference]: Finished difference Result 2110 states and 7189 transitions. [2021-07-13 19:57:26,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:57:26,839 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:26,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:26,842 INFO L225 Difference]: With dead ends: 2110 [2021-07-13 19:57:26,842 INFO L226 Difference]: Without dead ends: 2091 [2021-07-13 19:57:26,843 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 1093.5ms TimeCoverageRelationStatistics Valid=269, Invalid=1537, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:57:26,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2091 states. [2021-07-13 19:57:26,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2091 to 1651. [2021-07-13 19:57:26,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1651 states, 1650 states have (on average 3.5090909090909093) internal successors, (5790), 1650 states have internal predecessors, (5790), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:26,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1651 states to 1651 states and 5790 transitions. [2021-07-13 19:57:26,865 INFO L78 Accepts]: Start accepts. Automaton has 1651 states and 5790 transitions. Word has length 24 [2021-07-13 19:57:26,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:26,865 INFO L482 AbstractCegarLoop]: Abstraction has 1651 states and 5790 transitions. [2021-07-13 19:57:26,865 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:26,865 INFO L276 IsEmpty]: Start isEmpty. Operand 1651 states and 5790 transitions. [2021-07-13 19:57:26,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:26,868 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:26,868 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:27,068 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable263,155 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:27,068 INFO L430 AbstractCegarLoop]: === Iteration 167 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:27,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:27,068 INFO L82 PathProgramCache]: Analyzing trace with hash 227212270, now seen corresponding path program 64 times [2021-07-13 19:57:27,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:27,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073506169] [2021-07-13 19:57:27,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:27,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:27,249 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:27,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:27,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073506169] [2021-07-13 19:57:27,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073506169] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:27,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686947781] [2021-07-13 19:57:27,250 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 156 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 156 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:27,277 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:57:27,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:27,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:27,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:27,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:27,410 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:27,413 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:27,413 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:27,413 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:57:27,462 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:27,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686947781] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:27,462 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:27,462 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:27,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121678659] [2021-07-13 19:57:27,462 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:27,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:27,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:27,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:27,463 INFO L87 Difference]: Start difference. First operand 1651 states and 5790 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:28,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:28,493 INFO L93 Difference]: Finished difference Result 2132 states and 7279 transitions. [2021-07-13 19:57:28,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:57:28,493 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:28,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:28,497 INFO L225 Difference]: With dead ends: 2132 [2021-07-13 19:57:28,497 INFO L226 Difference]: Without dead ends: 2119 [2021-07-13 19:57:28,497 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 846.7ms TimeCoverageRelationStatistics Valid=248, Invalid=1312, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 19:57:28,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2021-07-13 19:57:28,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1649. [2021-07-13 19:57:28,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1649 states, 1648 states have (on average 3.5097087378640777) internal successors, (5784), 1648 states have internal predecessors, (5784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:28,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1649 states to 1649 states and 5784 transitions. [2021-07-13 19:57:28,528 INFO L78 Accepts]: Start accepts. Automaton has 1649 states and 5784 transitions. Word has length 24 [2021-07-13 19:57:28,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:28,529 INFO L482 AbstractCegarLoop]: Abstraction has 1649 states and 5784 transitions. [2021-07-13 19:57:28,529 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:28,529 INFO L276 IsEmpty]: Start isEmpty. Operand 1649 states and 5784 transitions. [2021-07-13 19:57:28,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:28,531 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:28,531 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:28,731 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable272,156 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:28,732 INFO L430 AbstractCegarLoop]: === Iteration 168 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:28,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:28,732 INFO L82 PathProgramCache]: Analyzing trace with hash -605413130, now seen corresponding path program 65 times [2021-07-13 19:57:28,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:28,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472353552] [2021-07-13 19:57:28,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:28,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:28,925 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:28,925 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:28,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472353552] [2021-07-13 19:57:28,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472353552] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:28,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002085101] [2021-07-13 19:57:28,926 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 157 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 157 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:28,962 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:57:28,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:28,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:28,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:29,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:29,066 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:29,069 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:29,070 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:29,070 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:57:29,134 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:29,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002085101] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:29,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:29,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:29,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368589128] [2021-07-13 19:57:29,134 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:29,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:29,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:29,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:29,135 INFO L87 Difference]: Start difference. First operand 1649 states and 5784 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:30,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:30,205 INFO L93 Difference]: Finished difference Result 2060 states and 7057 transitions. [2021-07-13 19:57:30,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 19:57:30,205 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:30,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:30,209 INFO L225 Difference]: With dead ends: 2060 [2021-07-13 19:57:30,209 INFO L226 Difference]: Without dead ends: 2051 [2021-07-13 19:57:30,209 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 854.9ms TimeCoverageRelationStatistics Valid=248, Invalid=1234, Unknown=0, NotChecked=0, Total=1482 [2021-07-13 19:57:30,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2051 states. [2021-07-13 19:57:30,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2051 to 1653. [2021-07-13 19:57:30,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1653 states, 1652 states have (on average 3.5090799031476996) internal successors, (5797), 1652 states have internal predecessors, (5797), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:30,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1653 states to 1653 states and 5797 transitions. [2021-07-13 19:57:30,232 INFO L78 Accepts]: Start accepts. Automaton has 1653 states and 5797 transitions. Word has length 24 [2021-07-13 19:57:30,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:30,232 INFO L482 AbstractCegarLoop]: Abstraction has 1653 states and 5797 transitions. [2021-07-13 19:57:30,232 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:30,232 INFO L276 IsEmpty]: Start isEmpty. Operand 1653 states and 5797 transitions. [2021-07-13 19:57:30,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:30,234 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:30,234 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:30,434 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable273,157 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:30,434 INFO L430 AbstractCegarLoop]: === Iteration 169 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:30,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:30,435 INFO L82 PathProgramCache]: Analyzing trace with hash -281826952, now seen corresponding path program 66 times [2021-07-13 19:57:30,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:30,435 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018998701] [2021-07-13 19:57:30,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:30,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:30,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:30,606 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:30,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018998701] [2021-07-13 19:57:30,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018998701] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:30,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724128523] [2021-07-13 19:57:30,606 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 158 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 158 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:30,633 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:57:30,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:30,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:57:30,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:30,751 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:30,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:57:30,753 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:30,764 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:30,764 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:30,764 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 19:57:30,906 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:30,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724128523] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:30,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:30,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:57:30,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496725107] [2021-07-13 19:57:30,906 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:30,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:30,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:30,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:30,907 INFO L87 Difference]: Start difference. First operand 1653 states and 5797 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:32,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:32,278 INFO L93 Difference]: Finished difference Result 2157 states and 7303 transitions. [2021-07-13 19:57:32,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 19:57:32,278 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:32,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:32,282 INFO L225 Difference]: With dead ends: 2157 [2021-07-13 19:57:32,282 INFO L226 Difference]: Without dead ends: 2138 [2021-07-13 19:57:32,282 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 1205.0ms TimeCoverageRelationStatistics Valid=365, Invalid=1615, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 19:57:32,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2138 states. [2021-07-13 19:57:32,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2138 to 1657. [2021-07-13 19:57:32,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1657 states, 1656 states have (on average 3.510265700483092) internal successors, (5813), 1656 states have internal predecessors, (5813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:32,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1657 states to 1657 states and 5813 transitions. [2021-07-13 19:57:32,307 INFO L78 Accepts]: Start accepts. Automaton has 1657 states and 5813 transitions. Word has length 24 [2021-07-13 19:57:32,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:32,307 INFO L482 AbstractCegarLoop]: Abstraction has 1657 states and 5813 transitions. [2021-07-13 19:57:32,307 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:32,307 INFO L276 IsEmpty]: Start isEmpty. Operand 1657 states and 5813 transitions. [2021-07-13 19:57:32,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:32,309 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:32,310 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:32,510 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable274,158 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:32,510 INFO L430 AbstractCegarLoop]: === Iteration 170 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:32,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:32,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1403917170, now seen corresponding path program 67 times [2021-07-13 19:57:32,510 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:32,510 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700266913] [2021-07-13 19:57:32,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:32,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:32,687 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:32,687 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:32,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700266913] [2021-07-13 19:57:32,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700266913] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:32,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061479610] [2021-07-13 19:57:32,688 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 159 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 159 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:32,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:32,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:32,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:32,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:32,822 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:32,827 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:32,827 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:32,828 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:57:32,900 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:32,901 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061479610] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:32,901 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:32,901 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:57:32,901 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620429694] [2021-07-13 19:57:32,901 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:57:32,901 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:32,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:57:32,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:57:32,902 INFO L87 Difference]: Start difference. First operand 1657 states and 5813 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:33,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:33,815 INFO L93 Difference]: Finished difference Result 2022 states and 6937 transitions. [2021-07-13 19:57:33,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:57:33,815 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:33,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:33,819 INFO L225 Difference]: With dead ends: 2022 [2021-07-13 19:57:33,819 INFO L226 Difference]: Without dead ends: 2011 [2021-07-13 19:57:33,819 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 789.0ms TimeCoverageRelationStatistics Valid=193, Invalid=997, Unknown=0, NotChecked=0, Total=1190 [2021-07-13 19:57:33,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2011 states. [2021-07-13 19:57:33,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2011 to 1656. [2021-07-13 19:57:33,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1656 states, 1655 states have (on average 3.5099697885196375) internal successors, (5809), 1655 states have internal predecessors, (5809), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:33,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1656 states to 1656 states and 5809 transitions. [2021-07-13 19:57:33,841 INFO L78 Accepts]: Start accepts. Automaton has 1656 states and 5809 transitions. Word has length 24 [2021-07-13 19:57:33,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:33,842 INFO L482 AbstractCegarLoop]: Abstraction has 1656 states and 5809 transitions. [2021-07-13 19:57:33,842 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:33,842 INFO L276 IsEmpty]: Start isEmpty. Operand 1656 states and 5809 transitions. [2021-07-13 19:57:33,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:33,844 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:33,844 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:34,044 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 159 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable277 [2021-07-13 19:57:34,044 INFO L430 AbstractCegarLoop]: === Iteration 171 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:34,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:34,045 INFO L82 PathProgramCache]: Analyzing trace with hash -308336314, now seen corresponding path program 68 times [2021-07-13 19:57:34,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:34,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601108852] [2021-07-13 19:57:34,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:34,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:34,213 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:34,213 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:34,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601108852] [2021-07-13 19:57:34,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601108852] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:34,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375756160] [2021-07-13 19:57:34,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 160 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 160 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:34,242 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:57:34,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:34,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:34,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:34,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:34,346 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:34,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:34,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:34,350 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:57:34,412 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:34,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375756160] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:34,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:34,412 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:34,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864528929] [2021-07-13 19:57:34,412 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:34,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:34,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:34,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:34,413 INFO L87 Difference]: Start difference. First operand 1656 states and 5809 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:35,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:35,393 INFO L93 Difference]: Finished difference Result 2080 states and 7118 transitions. [2021-07-13 19:57:35,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 19:57:35,393 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:35,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:35,397 INFO L225 Difference]: With dead ends: 2080 [2021-07-13 19:57:35,397 INFO L226 Difference]: Without dead ends: 2071 [2021-07-13 19:57:35,397 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 803.9ms TimeCoverageRelationStatistics Valid=242, Invalid=1240, Unknown=0, NotChecked=0, Total=1482 [2021-07-13 19:57:35,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2071 states. [2021-07-13 19:57:35,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2071 to 1657. [2021-07-13 19:57:35,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1657 states, 1656 states have (on average 3.510265700483092) internal successors, (5813), 1656 states have internal predecessors, (5813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:35,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1657 states to 1657 states and 5813 transitions. [2021-07-13 19:57:35,420 INFO L78 Accepts]: Start accepts. Automaton has 1657 states and 5813 transitions. Word has length 24 [2021-07-13 19:57:35,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:35,420 INFO L482 AbstractCegarLoop]: Abstraction has 1657 states and 5813 transitions. [2021-07-13 19:57:35,420 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:35,420 INFO L276 IsEmpty]: Start isEmpty. Operand 1657 states and 5813 transitions. [2021-07-13 19:57:35,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:35,423 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:35,423 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:35,636 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 160 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable278 [2021-07-13 19:57:35,637 INFO L430 AbstractCegarLoop]: === Iteration 172 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:35,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:35,637 INFO L82 PathProgramCache]: Analyzing trace with hash -2099197488, now seen corresponding path program 69 times [2021-07-13 19:57:35,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:35,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42971485] [2021-07-13 19:57:35,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:35,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:35,802 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:35,802 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:35,802 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42971485] [2021-07-13 19:57:35,802 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42971485] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:35,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975577685] [2021-07-13 19:57:35,803 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 161 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 161 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:35,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-13 19:57:35,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:35,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 19:57:35,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:35,969 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:35,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 21 treesize of output 53 [2021-07-13 19:57:35,970 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:35,994 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:36,015 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:36,015 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:476 [2021-07-13 19:57:36,212 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 47 [2021-07-13 19:57:36,579 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:36,579 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975577685] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:36,579 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:36,579 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:57:36,579 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933760320] [2021-07-13 19:57:36,579 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:57:36,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:36,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:57:36,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:57:36,580 INFO L87 Difference]: Start difference. First operand 1657 states and 5813 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:37,371 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 52 [2021-07-13 19:57:37,667 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 65 [2021-07-13 19:57:38,434 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 58 [2021-07-13 19:57:38,573 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 58 [2021-07-13 19:57:39,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:39,116 INFO L93 Difference]: Finished difference Result 2129 states and 7217 transitions. [2021-07-13 19:57:39,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 19:57:39,116 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:39,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:39,120 INFO L225 Difference]: With dead ends: 2129 [2021-07-13 19:57:39,120 INFO L226 Difference]: Without dead ends: 2119 [2021-07-13 19:57:39,120 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 792 ImplicationChecksByTransitivity, 2626.1ms TimeCoverageRelationStatistics Valid=471, Invalid=2285, Unknown=0, NotChecked=0, Total=2756 [2021-07-13 19:57:39,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2021-07-13 19:57:39,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1661. [2021-07-13 19:57:39,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1661 states, 1660 states have (on average 3.5096385542168673) internal successors, (5826), 1660 states have internal predecessors, (5826), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:39,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1661 states to 1661 states and 5826 transitions. [2021-07-13 19:57:39,143 INFO L78 Accepts]: Start accepts. Automaton has 1661 states and 5826 transitions. Word has length 24 [2021-07-13 19:57:39,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:39,143 INFO L482 AbstractCegarLoop]: Abstraction has 1661 states and 5826 transitions. [2021-07-13 19:57:39,143 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:39,143 INFO L276 IsEmpty]: Start isEmpty. Operand 1661 states and 5826 transitions. [2021-07-13 19:57:39,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:39,145 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:39,145 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:39,346 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 161 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable279 [2021-07-13 19:57:39,346 INFO L430 AbstractCegarLoop]: === Iteration 173 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:39,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:39,346 INFO L82 PathProgramCache]: Analyzing trace with hash -1317363688, now seen corresponding path program 70 times [2021-07-13 19:57:39,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:39,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785713334] [2021-07-13 19:57:39,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:39,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:39,537 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:39,538 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:39,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785713334] [2021-07-13 19:57:39,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1785713334] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:39,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632940906] [2021-07-13 19:57:39,538 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 162 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 162 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:39,580 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:57:39,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:39,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:39,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:39,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:39,692 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:39,696 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:39,696 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:39,696 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:57:39,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:39,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632940906] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:39,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:39,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:57:39,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954924233] [2021-07-13 19:57:39,758 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:57:39,758 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:39,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:57:39,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:57:39,758 INFO L87 Difference]: Start difference. First operand 1661 states and 5826 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:40,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:40,501 INFO L93 Difference]: Finished difference Result 2022 states and 6939 transitions. [2021-07-13 19:57:40,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-13 19:57:40,501 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:40,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:40,505 INFO L225 Difference]: With dead ends: 2022 [2021-07-13 19:57:40,505 INFO L226 Difference]: Without dead ends: 2012 [2021-07-13 19:57:40,505 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 697.3ms TimeCoverageRelationStatistics Valid=191, Invalid=931, Unknown=0, NotChecked=0, Total=1122 [2021-07-13 19:57:40,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2012 states. [2021-07-13 19:57:40,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2012 to 1658. [2021-07-13 19:57:40,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1658 states, 1657 states have (on average 3.5093542546771275) internal successors, (5815), 1657 states have internal predecessors, (5815), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:40,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1658 states to 1658 states and 5815 transitions. [2021-07-13 19:57:40,527 INFO L78 Accepts]: Start accepts. Automaton has 1658 states and 5815 transitions. Word has length 24 [2021-07-13 19:57:40,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:40,527 INFO L482 AbstractCegarLoop]: Abstraction has 1658 states and 5815 transitions. [2021-07-13 19:57:40,527 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:40,528 INFO L276 IsEmpty]: Start isEmpty. Operand 1658 states and 5815 transitions. [2021-07-13 19:57:40,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:40,530 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:40,530 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:40,731 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable290,162 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:40,731 INFO L430 AbstractCegarLoop]: === Iteration 174 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:40,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:40,732 INFO L82 PathProgramCache]: Analyzing trace with hash -372308144, now seen corresponding path program 71 times [2021-07-13 19:57:40,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:40,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185649559] [2021-07-13 19:57:40,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:40,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:40,898 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:40,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:40,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185649559] [2021-07-13 19:57:40,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185649559] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:40,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412897121] [2021-07-13 19:57:40,899 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 163 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 163 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:40,925 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:57:40,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:40,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:40,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:41,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:41,030 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:41,033 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:41,034 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:41,034 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:57:41,098 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:41,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412897121] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:41,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:41,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:41,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322213791] [2021-07-13 19:57:41,098 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:41,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:41,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:41,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:41,099 INFO L87 Difference]: Start difference. First operand 1658 states and 5815 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:42,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:42,035 INFO L93 Difference]: Finished difference Result 2057 states and 7052 transitions. [2021-07-13 19:57:42,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:57:42,035 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:42,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:42,038 INFO L225 Difference]: With dead ends: 2057 [2021-07-13 19:57:42,039 INFO L226 Difference]: Without dead ends: 2046 [2021-07-13 19:57:42,039 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 770.2ms TimeCoverageRelationStatistics Valid=218, Invalid=1114, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:57:42,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2046 states. [2021-07-13 19:57:42,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2046 to 1660. [2021-07-13 19:57:42,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1660 states, 1659 states have (on average 3.5087402049427365) internal successors, (5821), 1659 states have internal predecessors, (5821), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:42,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1660 states to 1660 states and 5821 transitions. [2021-07-13 19:57:42,061 INFO L78 Accepts]: Start accepts. Automaton has 1660 states and 5821 transitions. Word has length 24 [2021-07-13 19:57:42,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:42,061 INFO L482 AbstractCegarLoop]: Abstraction has 1660 states and 5821 transitions. [2021-07-13 19:57:42,061 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:42,061 INFO L276 IsEmpty]: Start isEmpty. Operand 1660 states and 5821 transitions. [2021-07-13 19:57:42,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:42,063 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:42,064 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:42,264 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable291,163 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:42,265 INFO L430 AbstractCegarLoop]: === Iteration 175 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:42,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:42,265 INFO L82 PathProgramCache]: Analyzing trace with hash 607106304, now seen corresponding path program 72 times [2021-07-13 19:57:42,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:42,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783977350] [2021-07-13 19:57:42,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:42,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:42,437 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:42,437 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:42,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783977350] [2021-07-13 19:57:42,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783977350] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:42,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375353530] [2021-07-13 19:57:42,438 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 164 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 164 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:42,467 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:57:42,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:42,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:57:42,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:42,600 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:42,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:57:42,601 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:42,612 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:42,613 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:42,613 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 19:57:42,772 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:42,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375353530] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:42,772 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:42,772 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:57:42,772 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762817251] [2021-07-13 19:57:42,772 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:42,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:42,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:42,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:42,773 INFO L87 Difference]: Start difference. First operand 1660 states and 5821 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:44,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:44,244 INFO L93 Difference]: Finished difference Result 2168 states and 7318 transitions. [2021-07-13 19:57:44,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-07-13 19:57:44,244 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:44,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:44,248 INFO L225 Difference]: With dead ends: 2168 [2021-07-13 19:57:44,248 INFO L226 Difference]: Without dead ends: 2149 [2021-07-13 19:57:44,249 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 1251.4ms TimeCoverageRelationStatistics Valid=387, Invalid=1775, Unknown=0, NotChecked=0, Total=2162 [2021-07-13 19:57:44,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2021-07-13 19:57:44,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 1662. [2021-07-13 19:57:44,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1662 states, 1661 states have (on average 3.5099337748344372) internal successors, (5830), 1661 states have internal predecessors, (5830), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:44,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1662 states to 1662 states and 5830 transitions. [2021-07-13 19:57:44,282 INFO L78 Accepts]: Start accepts. Automaton has 1662 states and 5830 transitions. Word has length 24 [2021-07-13 19:57:44,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:44,282 INFO L482 AbstractCegarLoop]: Abstraction has 1662 states and 5830 transitions. [2021-07-13 19:57:44,282 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:44,282 INFO L276 IsEmpty]: Start isEmpty. Operand 1662 states and 5830 transitions. [2021-07-13 19:57:44,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:44,284 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:44,284 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:44,484 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 164 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable292 [2021-07-13 19:57:44,485 INFO L430 AbstractCegarLoop]: === Iteration 176 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:44,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:44,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1967070794, now seen corresponding path program 73 times [2021-07-13 19:57:44,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:44,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517860597] [2021-07-13 19:57:44,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:44,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:44,669 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:44,670 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:44,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517860597] [2021-07-13 19:57:44,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517860597] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:44,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918051706] [2021-07-13 19:57:44,670 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 165 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 165 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:44,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:44,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:44,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:44,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:44,816 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:44,819 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:44,820 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:44,820 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:57:44,881 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:44,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918051706] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:44,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:44,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:57:44,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041425785] [2021-07-13 19:57:44,882 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:57:44,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:44,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:57:44,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:57:44,882 INFO L87 Difference]: Start difference. First operand 1662 states and 5830 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:45,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:45,678 INFO L93 Difference]: Finished difference Result 2006 states and 6892 transitions. [2021-07-13 19:57:45,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-07-13 19:57:45,679 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:45,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:45,682 INFO L225 Difference]: With dead ends: 2006 [2021-07-13 19:57:45,682 INFO L226 Difference]: Without dead ends: 1996 [2021-07-13 19:57:45,682 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 708.4ms TimeCoverageRelationStatistics Valid=186, Invalid=936, Unknown=0, NotChecked=0, Total=1122 [2021-07-13 19:57:45,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1996 states. [2021-07-13 19:57:45,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1996 to 1660. [2021-07-13 19:57:45,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1660 states, 1659 states have (on average 3.5099457504520797) internal successors, (5823), 1659 states have internal predecessors, (5823), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:45,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1660 states to 1660 states and 5823 transitions. [2021-07-13 19:57:45,705 INFO L78 Accepts]: Start accepts. Automaton has 1660 states and 5823 transitions. Word has length 24 [2021-07-13 19:57:45,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:45,705 INFO L482 AbstractCegarLoop]: Abstraction has 1660 states and 5823 transitions. [2021-07-13 19:57:45,705 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:45,705 INFO L276 IsEmpty]: Start isEmpty. Operand 1660 states and 5823 transitions. [2021-07-13 19:57:45,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:45,707 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:45,707 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:45,908 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable295,165 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:45,908 INFO L430 AbstractCegarLoop]: === Iteration 177 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:45,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:45,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1147399810, now seen corresponding path program 69 times [2021-07-13 19:57:45,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:45,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368782167] [2021-07-13 19:57:45,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:45,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:46,114 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:46,114 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:46,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368782167] [2021-07-13 19:57:46,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368782167] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:46,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003201812] [2021-07-13 19:57:46,114 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 166 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 166 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:46,141 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:57:46,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:46,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:57:46,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:46,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:46,365 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:57:46,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:57:46,367 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:46,371 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:46,372 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:46,372 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:57:46,404 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:46,404 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003201812] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:46,404 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:46,404 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:57:46,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605125979] [2021-07-13 19:57:46,404 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:57:46,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:46,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:57:46,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:57:46,405 INFO L87 Difference]: Start difference. First operand 1660 states and 5823 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:47,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:47,459 INFO L93 Difference]: Finished difference Result 2254 states and 7645 transitions. [2021-07-13 19:57:47,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-13 19:57:47,459 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:47,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:47,463 INFO L225 Difference]: With dead ends: 2254 [2021-07-13 19:57:47,463 INFO L226 Difference]: Without dead ends: 2244 [2021-07-13 19:57:47,463 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 840.8ms TimeCoverageRelationStatistics Valid=243, Invalid=1563, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:57:47,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2244 states. [2021-07-13 19:57:47,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2244 to 1663. [2021-07-13 19:57:47,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1663 states, 1662 states have (on average 3.509025270758123) internal successors, (5832), 1662 states have internal predecessors, (5832), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:47,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1663 states to 1663 states and 5832 transitions. [2021-07-13 19:57:47,487 INFO L78 Accepts]: Start accepts. Automaton has 1663 states and 5832 transitions. Word has length 24 [2021-07-13 19:57:47,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:47,487 INFO L482 AbstractCegarLoop]: Abstraction has 1663 states and 5832 transitions. [2021-07-13 19:57:47,487 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:47,487 INFO L276 IsEmpty]: Start isEmpty. Operand 1663 states and 5832 transitions. [2021-07-13 19:57:47,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:47,489 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:47,489 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:47,690 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable296,166 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:47,690 INFO L430 AbstractCegarLoop]: === Iteration 178 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:47,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:47,690 INFO L82 PathProgramCache]: Analyzing trace with hash 1639485428, now seen corresponding path program 70 times [2021-07-13 19:57:47,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:47,690 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541358735] [2021-07-13 19:57:47,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:47,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:47,874 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:47,874 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:47,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541358735] [2021-07-13 19:57:47,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541358735] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:47,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593703559] [2021-07-13 19:57:47,875 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 167 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 167 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:47,901 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:57:47,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:47,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:47,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:48,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:57:48,054 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:48,055 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:48,056 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:48,056 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:57:48,085 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:48,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593703559] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:48,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:48,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:57:48,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930667547] [2021-07-13 19:57:48,100 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:48,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:48,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:48,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:48,101 INFO L87 Difference]: Start difference. First operand 1663 states and 5832 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:49,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:49,448 INFO L93 Difference]: Finished difference Result 2340 states and 7929 transitions. [2021-07-13 19:57:49,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-07-13 19:57:49,449 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:49,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:49,453 INFO L225 Difference]: With dead ends: 2340 [2021-07-13 19:57:49,453 INFO L226 Difference]: Without dead ends: 2318 [2021-07-13 19:57:49,454 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1004.1ms TimeCoverageRelationStatistics Valid=275, Invalid=1617, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 19:57:49,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2318 states. [2021-07-13 19:57:49,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2318 to 1666. [2021-07-13 19:57:49,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1666 states, 1665 states have (on average 3.5081081081081082) internal successors, (5841), 1665 states have internal predecessors, (5841), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:49,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1666 states to 1666 states and 5841 transitions. [2021-07-13 19:57:49,481 INFO L78 Accepts]: Start accepts. Automaton has 1666 states and 5841 transitions. Word has length 24 [2021-07-13 19:57:49,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:49,481 INFO L482 AbstractCegarLoop]: Abstraction has 1666 states and 5841 transitions. [2021-07-13 19:57:49,481 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:49,481 INFO L276 IsEmpty]: Start isEmpty. Operand 1666 states and 5841 transitions. [2021-07-13 19:57:49,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:49,483 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:49,484 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:49,684 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable297,167 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:49,684 INFO L430 AbstractCegarLoop]: === Iteration 179 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:49,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:49,684 INFO L82 PathProgramCache]: Analyzing trace with hash -719238356, now seen corresponding path program 71 times [2021-07-13 19:57:49,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:49,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5116532] [2021-07-13 19:57:49,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:49,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:49,873 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:49,873 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:49,873 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5116532] [2021-07-13 19:57:49,873 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [5116532] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:49,873 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557529931] [2021-07-13 19:57:49,873 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 168 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 168 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:49,900 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:57:49,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:49,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:49,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:50,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:50,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:50,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:57:50,150 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:57:50,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 12 [2021-07-13 19:57:50,151 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:50,157 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:50,158 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:50,158 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:28, output treesize:5 [2021-07-13 19:57:50,203 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:50,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557529931] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:50,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:50,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:57:50,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183460332] [2021-07-13 19:57:50,204 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:57:50,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:50,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:57:50,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:57:50,205 INFO L87 Difference]: Start difference. First operand 1666 states and 5841 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:51,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:51,438 INFO L93 Difference]: Finished difference Result 2248 states and 7620 transitions. [2021-07-13 19:57:51,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 19:57:51,438 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:51,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:51,442 INFO L225 Difference]: With dead ends: 2248 [2021-07-13 19:57:51,442 INFO L226 Difference]: Without dead ends: 2226 [2021-07-13 19:57:51,443 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 991.4ms TimeCoverageRelationStatistics Valid=242, Invalid=1650, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 19:57:51,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2226 states. [2021-07-13 19:57:51,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2226 to 1669. [2021-07-13 19:57:51,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1669 states, 1668 states have (on average 3.5071942446043165) internal successors, (5850), 1668 states have internal predecessors, (5850), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:51,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1669 states to 1669 states and 5850 transitions. [2021-07-13 19:57:51,467 INFO L78 Accepts]: Start accepts. Automaton has 1669 states and 5850 transitions. Word has length 24 [2021-07-13 19:57:51,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:51,467 INFO L482 AbstractCegarLoop]: Abstraction has 1669 states and 5850 transitions. [2021-07-13 19:57:51,467 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:51,467 INFO L276 IsEmpty]: Start isEmpty. Operand 1669 states and 5850 transitions. [2021-07-13 19:57:51,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:51,470 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:51,470 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:51,670 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable298,168 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:51,671 INFO L430 AbstractCegarLoop]: === Iteration 180 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:51,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:51,671 INFO L82 PathProgramCache]: Analyzing trace with hash -895779788, now seen corresponding path program 72 times [2021-07-13 19:57:51,671 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:51,671 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065068274] [2021-07-13 19:57:51,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:51,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:51,836 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:51,837 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:51,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065068274] [2021-07-13 19:57:51,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065068274] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:51,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972281272] [2021-07-13 19:57:51,837 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 169 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 169 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:51,867 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-07-13 19:57:51,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:51,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:57:51,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:52,004 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:52,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:57:52,005 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:52,015 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:52,016 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:52,016 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:57:52,100 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:52,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972281272] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:52,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:52,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:57:52,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629643822] [2021-07-13 19:57:52,100 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:52,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:52,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:52,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:52,101 INFO L87 Difference]: Start difference. First operand 1669 states and 5850 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:53,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:53,201 INFO L93 Difference]: Finished difference Result 2232 states and 7581 transitions. [2021-07-13 19:57:53,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-07-13 19:57:53,202 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:53,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:53,206 INFO L225 Difference]: With dead ends: 2232 [2021-07-13 19:57:53,206 INFO L226 Difference]: Without dead ends: 2222 [2021-07-13 19:57:53,206 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 980.0ms TimeCoverageRelationStatistics Valid=310, Invalid=1760, Unknown=0, NotChecked=0, Total=2070 [2021-07-13 19:57:53,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2222 states. [2021-07-13 19:57:53,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2222 to 1673. [2021-07-13 19:57:53,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1673 states, 1672 states have (on average 3.5053827751196174) internal successors, (5861), 1672 states have internal predecessors, (5861), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:53,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1673 states to 1673 states and 5861 transitions. [2021-07-13 19:57:53,230 INFO L78 Accepts]: Start accepts. Automaton has 1673 states and 5861 transitions. Word has length 24 [2021-07-13 19:57:53,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:53,230 INFO L482 AbstractCegarLoop]: Abstraction has 1673 states and 5861 transitions. [2021-07-13 19:57:53,230 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:53,230 INFO L276 IsEmpty]: Start isEmpty. Operand 1673 states and 5861 transitions. [2021-07-13 19:57:53,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:53,232 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:53,233 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:53,433 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 169 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable299 [2021-07-13 19:57:53,433 INFO L430 AbstractCegarLoop]: === Iteration 181 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:53,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:53,433 INFO L82 PathProgramCache]: Analyzing trace with hash -412454626, now seen corresponding path program 73 times [2021-07-13 19:57:53,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:53,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666796525] [2021-07-13 19:57:53,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:53,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:53,631 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:53,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:53,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666796525] [2021-07-13 19:57:53,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666796525] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:53,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604820044] [2021-07-13 19:57:53,631 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 170 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 170 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:53,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:53,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:53,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:53,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:57:53,782 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:53,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:53,785 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:53,786 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:57:53,834 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:53,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604820044] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:53,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:53,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:57:53,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292740389] [2021-07-13 19:57:53,834 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:57:53,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:53,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:57:53,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:57:53,835 INFO L87 Difference]: Start difference. First operand 1673 states and 5861 transitions. Second operand has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 22 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:54,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:54,768 INFO L93 Difference]: Finished difference Result 2202 states and 7495 transitions. [2021-07-13 19:57:54,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 19:57:54,768 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 22 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:54,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:54,772 INFO L225 Difference]: With dead ends: 2202 [2021-07-13 19:57:54,772 INFO L226 Difference]: Without dead ends: 2191 [2021-07-13 19:57:54,772 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 774.2ms TimeCoverageRelationStatistics Valid=245, Invalid=1395, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 19:57:54,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2191 states. [2021-07-13 19:57:54,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2191 to 1660. [2021-07-13 19:57:54,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1660 states, 1659 states have (on average 3.5099457504520797) internal successors, (5823), 1659 states have internal predecessors, (5823), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:54,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1660 states to 1660 states and 5823 transitions. [2021-07-13 19:57:54,806 INFO L78 Accepts]: Start accepts. Automaton has 1660 states and 5823 transitions. Word has length 24 [2021-07-13 19:57:54,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:54,806 INFO L482 AbstractCegarLoop]: Abstraction has 1660 states and 5823 transitions. [2021-07-13 19:57:54,806 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 22 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:54,806 INFO L276 IsEmpty]: Start isEmpty. Operand 1660 states and 5823 transitions. [2021-07-13 19:57:54,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:54,809 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:54,809 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:55,009 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 170 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable301 [2021-07-13 19:57:55,009 INFO L430 AbstractCegarLoop]: === Iteration 182 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:55,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:55,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1796534024, now seen corresponding path program 74 times [2021-07-13 19:57:55,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:55,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857511893] [2021-07-13 19:57:55,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:55,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:55,187 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:55,187 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:55,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857511893] [2021-07-13 19:57:55,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857511893] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:55,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153771681] [2021-07-13 19:57:55,188 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 171 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 171 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:55,214 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:57:55,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:55,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:57:55,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:55,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:57:55,463 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:57:55,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:57:55,465 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:55,470 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:55,472 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:55,472 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:57:55,517 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:55,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153771681] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:55,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:55,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:57:55,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487448681] [2021-07-13 19:57:55,518 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:57:55,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:55,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:57:55,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:57:55,519 INFO L87 Difference]: Start difference. First operand 1660 states and 5823 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:56,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:56,672 INFO L93 Difference]: Finished difference Result 2228 states and 7569 transitions. [2021-07-13 19:57:56,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-07-13 19:57:56,672 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:56,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:56,676 INFO L225 Difference]: With dead ends: 2228 [2021-07-13 19:57:56,676 INFO L226 Difference]: Without dead ends: 2219 [2021-07-13 19:57:56,676 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 839.0ms TimeCoverageRelationStatistics Valid=237, Invalid=1485, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:57:56,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2219 states. [2021-07-13 19:57:56,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2219 to 1663. [2021-07-13 19:57:56,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1663 states, 1662 states have (on average 3.5096269554753308) internal successors, (5833), 1662 states have internal predecessors, (5833), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:56,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1663 states to 1663 states and 5833 transitions. [2021-07-13 19:57:56,700 INFO L78 Accepts]: Start accepts. Automaton has 1663 states and 5833 transitions. Word has length 24 [2021-07-13 19:57:56,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:56,700 INFO L482 AbstractCegarLoop]: Abstraction has 1663 states and 5833 transitions. [2021-07-13 19:57:56,700 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:56,700 INFO L276 IsEmpty]: Start isEmpty. Operand 1663 states and 5833 transitions. [2021-07-13 19:57:56,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:56,702 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:56,702 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:56,903 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 171 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable302 [2021-07-13 19:57:56,903 INFO L430 AbstractCegarLoop]: === Iteration 183 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:56,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:56,903 INFO L82 PathProgramCache]: Analyzing trace with hash 1586996644, now seen corresponding path program 75 times [2021-07-13 19:57:56,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:56,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380544056] [2021-07-13 19:57:56,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:56,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:57,094 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:57,094 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:57,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380544056] [2021-07-13 19:57:57,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380544056] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:57,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757498636] [2021-07-13 19:57:57,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 172 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 172 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:57,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:57:57,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:57,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:57,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:57,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:57:57,276 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:57,277 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:57,277 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:57,277 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:57:57,307 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:57,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [757498636] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:57,307 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:57,307 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:57:57,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736879179] [2021-07-13 19:57:57,308 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:57,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:57,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:57,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:57,308 INFO L87 Difference]: Start difference. First operand 1663 states and 5833 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:58,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:57:58,529 INFO L93 Difference]: Finished difference Result 2272 states and 7714 transitions. [2021-07-13 19:57:58,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 19:57:58,529 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:57:58,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:57:58,533 INFO L225 Difference]: With dead ends: 2272 [2021-07-13 19:57:58,533 INFO L226 Difference]: Without dead ends: 2253 [2021-07-13 19:57:58,534 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 963.1ms TimeCoverageRelationStatistics Valid=275, Invalid=1617, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 19:57:58,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2253 states. [2021-07-13 19:57:58,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2253 to 1666. [2021-07-13 19:57:58,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1666 states, 1665 states have (on average 3.5093093093093093) internal successors, (5843), 1665 states have internal predecessors, (5843), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:58,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1666 states to 1666 states and 5843 transitions. [2021-07-13 19:57:58,558 INFO L78 Accepts]: Start accepts. Automaton has 1666 states and 5843 transitions. Word has length 24 [2021-07-13 19:57:58,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:57:58,558 INFO L482 AbstractCegarLoop]: Abstraction has 1666 states and 5843 transitions. [2021-07-13 19:57:58,558 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:57:58,558 INFO L276 IsEmpty]: Start isEmpty. Operand 1666 states and 5843 transitions. [2021-07-13 19:57:58,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:57:58,560 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:57:58,560 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:57:58,761 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable303,172 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:58,761 INFO L430 AbstractCegarLoop]: === Iteration 184 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:57:58,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:57:58,761 INFO L82 PathProgramCache]: Analyzing trace with hash -979298906, now seen corresponding path program 76 times [2021-07-13 19:57:58,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:57:58,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835461625] [2021-07-13 19:57:58,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:57:58,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:57:58,983 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:58,983 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:57:58,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835461625] [2021-07-13 19:57:58,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835461625] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:58,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865019770] [2021-07-13 19:57:58,983 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 173 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 173 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:57:59,010 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:57:59,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:57:59,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:57:59,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:57:59,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:57:59,158 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:57:59,160 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:57:59,160 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:57:59,160 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:57:59,188 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:57:59,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865019770] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:57:59,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:57:59,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:57:59,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347252826] [2021-07-13 19:57:59,189 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:57:59,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:57:59,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:57:59,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:57:59,189 INFO L87 Difference]: Start difference. First operand 1666 states and 5843 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:00,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:00,318 INFO L93 Difference]: Finished difference Result 2224 states and 7572 transitions. [2021-07-13 19:58:00,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 19:58:00,319 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:00,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:00,323 INFO L225 Difference]: With dead ends: 2224 [2021-07-13 19:58:00,323 INFO L226 Difference]: Without dead ends: 2205 [2021-07-13 19:58:00,324 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 947.8ms TimeCoverageRelationStatistics Valid=268, Invalid=1538, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:58:00,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2205 states. [2021-07-13 19:58:00,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2205 to 1669. [2021-07-13 19:58:00,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1669 states, 1668 states have (on average 3.508992805755396) internal successors, (5853), 1668 states have internal predecessors, (5853), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:00,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1669 states to 1669 states and 5853 transitions. [2021-07-13 19:58:00,350 INFO L78 Accepts]: Start accepts. Automaton has 1669 states and 5853 transitions. Word has length 24 [2021-07-13 19:58:00,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:00,350 INFO L482 AbstractCegarLoop]: Abstraction has 1669 states and 5853 transitions. [2021-07-13 19:58:00,350 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:00,350 INFO L276 IsEmpty]: Start isEmpty. Operand 1669 states and 5853 transitions. [2021-07-13 19:58:00,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:00,353 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:00,353 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:00,553 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 173 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable304 [2021-07-13 19:58:00,554 INFO L430 AbstractCegarLoop]: === Iteration 185 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:00,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:00,554 INFO L82 PathProgramCache]: Analyzing trace with hash -2007448766, now seen corresponding path program 77 times [2021-07-13 19:58:00,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:00,554 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886016028] [2021-07-13 19:58:00,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:00,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:00,709 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:00,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:00,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886016028] [2021-07-13 19:58:00,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886016028] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:00,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831131201] [2021-07-13 19:58:00,710 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 174 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 174 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:00,737 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:58:00,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:00,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:00,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:00,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:00,858 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:00,861 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:00,861 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:00,862 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:00,908 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:00,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831131201] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:00,908 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:00,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:00,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628752614] [2021-07-13 19:58:00,908 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:00,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:00,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:00,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:00,909 INFO L87 Difference]: Start difference. First operand 1669 states and 5853 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:01,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:01,755 INFO L93 Difference]: Finished difference Result 2193 states and 7486 transitions. [2021-07-13 19:58:01,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:58:01,755 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:01,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:01,759 INFO L225 Difference]: With dead ends: 2193 [2021-07-13 19:58:01,759 INFO L226 Difference]: Without dead ends: 2184 [2021-07-13 19:58:01,759 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 670.7ms TimeCoverageRelationStatistics Valid=221, Invalid=1111, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:58:01,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2184 states. [2021-07-13 19:58:01,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2184 to 1676. [2021-07-13 19:58:01,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1676 states, 1675 states have (on average 3.5074626865671643) internal successors, (5875), 1675 states have internal predecessors, (5875), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:01,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1676 states to 1676 states and 5875 transitions. [2021-07-13 19:58:01,783 INFO L78 Accepts]: Start accepts. Automaton has 1676 states and 5875 transitions. Word has length 24 [2021-07-13 19:58:01,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:01,783 INFO L482 AbstractCegarLoop]: Abstraction has 1676 states and 5875 transitions. [2021-07-13 19:58:01,783 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:01,783 INFO L276 IsEmpty]: Start isEmpty. Operand 1676 states and 5875 transitions. [2021-07-13 19:58:01,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:01,785 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:01,785 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:01,986 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable305,174 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:01,986 INFO L430 AbstractCegarLoop]: === Iteration 186 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:01,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:01,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1881534, now seen corresponding path program 78 times [2021-07-13 19:58:01,986 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:01,986 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115583646] [2021-07-13 19:58:01,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:01,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:02,138 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:02,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:02,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115583646] [2021-07-13 19:58:02,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2115583646] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:02,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874008829] [2021-07-13 19:58:02,139 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 175 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 175 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:02,166 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:58:02,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:02,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 28 conjunts are in the unsatisfiable core [2021-07-13 19:58:02,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:02,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:58:02,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:58:02,338 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:02,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 23 treesize of output 49 [2021-07-13 19:58:02,340 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:02,359 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:02,385 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-07-13 19:58:02,385 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:39, output treesize:118 [2021-07-13 19:58:02,494 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:02,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874008829] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:02,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:02,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 23 [2021-07-13 19:58:02,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824260684] [2021-07-13 19:58:02,495 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:58:02,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:02,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:58:02,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:58:02,495 INFO L87 Difference]: Start difference. First operand 1676 states and 5875 transitions. Second operand has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:03,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:03,579 INFO L93 Difference]: Finished difference Result 2099 states and 7191 transitions. [2021-07-13 19:58:03,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-13 19:58:03,580 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:03,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:03,584 INFO L225 Difference]: With dead ends: 2099 [2021-07-13 19:58:03,584 INFO L226 Difference]: Without dead ends: 2086 [2021-07-13 19:58:03,584 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 936.8ms TimeCoverageRelationStatistics Valid=247, Invalid=1475, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:58:03,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2086 states. [2021-07-13 19:58:03,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2086 to 1680. [2021-07-13 19:58:03,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1680 states, 1679 states have (on average 3.5080405002977963) internal successors, (5890), 1679 states have internal predecessors, (5890), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:03,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1680 states to 1680 states and 5890 transitions. [2021-07-13 19:58:03,611 INFO L78 Accepts]: Start accepts. Automaton has 1680 states and 5890 transitions. Word has length 24 [2021-07-13 19:58:03,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:03,611 INFO L482 AbstractCegarLoop]: Abstraction has 1680 states and 5890 transitions. [2021-07-13 19:58:03,611 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:03,611 INFO L276 IsEmpty]: Start isEmpty. Operand 1680 states and 5890 transitions. [2021-07-13 19:58:03,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:03,614 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:03,614 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:03,814 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable306,175 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:03,814 INFO L430 AbstractCegarLoop]: === Iteration 187 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:03,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:03,815 INFO L82 PathProgramCache]: Analyzing trace with hash -528846374, now seen corresponding path program 79 times [2021-07-13 19:58:03,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:03,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815726597] [2021-07-13 19:58:03,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:03,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:03,980 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:03,980 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:03,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815726597] [2021-07-13 19:58:03,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815726597] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:03,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270994410] [2021-07-13 19:58:03,980 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 176 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 176 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:04,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:04,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:04,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:04,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:04,145 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:04,148 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:04,149 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:04,149 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:04,195 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:04,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270994410] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:04,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:04,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:04,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727044770] [2021-07-13 19:58:04,196 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:04,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:04,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:04,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:04,197 INFO L87 Difference]: Start difference. First operand 1680 states and 5890 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:05,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:05,071 INFO L93 Difference]: Finished difference Result 2165 states and 7395 transitions. [2021-07-13 19:58:05,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:58:05,071 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:05,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:05,075 INFO L225 Difference]: With dead ends: 2165 [2021-07-13 19:58:05,076 INFO L226 Difference]: Without dead ends: 2156 [2021-07-13 19:58:05,076 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 695.0ms TimeCoverageRelationStatistics Valid=207, Invalid=1125, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:58:05,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2156 states. [2021-07-13 19:58:05,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2156 to 1669. [2021-07-13 19:58:05,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1669 states, 1668 states have (on average 3.5077937649880098) internal successors, (5851), 1668 states have internal predecessors, (5851), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:05,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1669 states to 1669 states and 5851 transitions. [2021-07-13 19:58:05,100 INFO L78 Accepts]: Start accepts. Automaton has 1669 states and 5851 transitions. Word has length 24 [2021-07-13 19:58:05,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:05,101 INFO L482 AbstractCegarLoop]: Abstraction has 1669 states and 5851 transitions. [2021-07-13 19:58:05,101 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:05,101 INFO L276 IsEmpty]: Start isEmpty. Operand 1669 states and 5851 transitions. [2021-07-13 19:58:05,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:05,103 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:05,103 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:05,303 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 176 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable315 [2021-07-13 19:58:05,304 INFO L430 AbstractCegarLoop]: === Iteration 188 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:05,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:05,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1485847398, now seen corresponding path program 74 times [2021-07-13 19:58:05,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:05,304 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679267853] [2021-07-13 19:58:05,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:05,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:05,496 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:05,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:05,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679267853] [2021-07-13 19:58:05,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679267853] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:05,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609307537] [2021-07-13 19:58:05,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 177 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 177 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:05,524 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:58:05,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:05,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:58:05,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:05,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:58:05,738 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:58:05,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:58:05,739 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:05,743 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:05,744 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:05,744 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:58:05,776 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:05,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609307537] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:05,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:05,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:58:05,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479825479] [2021-07-13 19:58:05,777 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:58:05,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:05,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:58:05,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=474, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:58:05,778 INFO L87 Difference]: Start difference. First operand 1669 states and 5851 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:07,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:07,415 INFO L93 Difference]: Finished difference Result 2362 states and 7905 transitions. [2021-07-13 19:58:07,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-07-13 19:58:07,416 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:07,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:07,420 INFO L225 Difference]: With dead ends: 2362 [2021-07-13 19:58:07,420 INFO L226 Difference]: Without dead ends: 2302 [2021-07-13 19:58:07,420 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 1276.6ms TimeCoverageRelationStatistics Valid=341, Invalid=2109, Unknown=0, NotChecked=0, Total=2450 [2021-07-13 19:58:07,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2302 states. [2021-07-13 19:58:07,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2302 to 1674. [2021-07-13 19:58:07,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1674 states, 1673 states have (on average 3.506276150627615) internal successors, (5866), 1673 states have internal predecessors, (5866), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:07,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1674 states to 1674 states and 5866 transitions. [2021-07-13 19:58:07,446 INFO L78 Accepts]: Start accepts. Automaton has 1674 states and 5866 transitions. Word has length 24 [2021-07-13 19:58:07,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:07,446 INFO L482 AbstractCegarLoop]: Abstraction has 1674 states and 5866 transitions. [2021-07-13 19:58:07,446 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:07,446 INFO L276 IsEmpty]: Start isEmpty. Operand 1674 states and 5866 transitions. [2021-07-13 19:58:07,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:07,448 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:07,448 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:07,649 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 177 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable316 [2021-07-13 19:58:07,649 INFO L430 AbstractCegarLoop]: === Iteration 189 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:07,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:07,649 INFO L82 PathProgramCache]: Analyzing trace with hash -221549916, now seen corresponding path program 75 times [2021-07-13 19:58:07,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:07,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432309474] [2021-07-13 19:58:07,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:07,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:07,867 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:07,867 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:07,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432309474] [2021-07-13 19:58:07,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432309474] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:07,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906975439] [2021-07-13 19:58:07,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 178 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 178 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:07,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:58:07,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:07,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:07,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:08,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:58:08,097 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:08,098 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:08,099 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:08,099 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:58:08,130 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:08,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906975439] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:08,130 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:08,130 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:58:08,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586141218] [2021-07-13 19:58:08,130 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:58:08,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:08,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:58:08,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:58:08,131 INFO L87 Difference]: Start difference. First operand 1674 states and 5866 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:09,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:09,836 INFO L93 Difference]: Finished difference Result 2284 states and 7716 transitions. [2021-07-13 19:58:09,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-07-13 19:58:09,836 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:09,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:09,840 INFO L225 Difference]: With dead ends: 2284 [2021-07-13 19:58:09,841 INFO L226 Difference]: Without dead ends: 2242 [2021-07-13 19:58:09,841 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 669 ImplicationChecksByTransitivity, 1409.9ms TimeCoverageRelationStatistics Valid=386, Invalid=2266, Unknown=0, NotChecked=0, Total=2652 [2021-07-13 19:58:09,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2242 states. [2021-07-13 19:58:09,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2242 to 1677. [2021-07-13 19:58:09,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1677 states, 1676 states have (on average 3.5053699284009547) internal successors, (5875), 1676 states have internal predecessors, (5875), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:09,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1677 states to 1677 states and 5875 transitions. [2021-07-13 19:58:09,865 INFO L78 Accepts]: Start accepts. Automaton has 1677 states and 5875 transitions. Word has length 24 [2021-07-13 19:58:09,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:09,865 INFO L482 AbstractCegarLoop]: Abstraction has 1677 states and 5875 transitions. [2021-07-13 19:58:09,865 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:09,865 INFO L276 IsEmpty]: Start isEmpty. Operand 1677 states and 5875 transitions. [2021-07-13 19:58:09,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:09,868 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:09,868 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:10,068 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 178 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable317 [2021-07-13 19:58:10,068 INFO L430 AbstractCegarLoop]: === Iteration 190 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:10,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:10,069 INFO L82 PathProgramCache]: Analyzing trace with hash -398091348, now seen corresponding path program 76 times [2021-07-13 19:58:10,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:10,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017857789] [2021-07-13 19:58:10,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:10,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:10,273 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:10,274 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:10,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017857789] [2021-07-13 19:58:10,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017857789] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:10,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809054944] [2021-07-13 19:58:10,274 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 179 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 179 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:10,300 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:58:10,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:10,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:10,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:10,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:10,430 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:10,433 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:10,433 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:10,433 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:10,481 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:10,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809054944] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:10,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:10,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:10,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966378096] [2021-07-13 19:58:10,482 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:10,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:10,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:10,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:10,482 INFO L87 Difference]: Start difference. First operand 1677 states and 5875 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:11,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:11,713 INFO L93 Difference]: Finished difference Result 2173 states and 7397 transitions. [2021-07-13 19:58:11,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-07-13 19:58:11,714 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:11,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:11,717 INFO L225 Difference]: With dead ends: 2173 [2021-07-13 19:58:11,718 INFO L226 Difference]: Without dead ends: 2143 [2021-07-13 19:58:11,718 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 1054.1ms TimeCoverageRelationStatistics Valid=354, Invalid=1808, Unknown=0, NotChecked=0, Total=2162 [2021-07-13 19:58:11,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2143 states. [2021-07-13 19:58:11,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2143 to 1679. [2021-07-13 19:58:11,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1679 states, 1678 states have (on average 3.505363528009535) internal successors, (5882), 1678 states have internal predecessors, (5882), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:11,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1679 states to 1679 states and 5882 transitions. [2021-07-13 19:58:11,740 INFO L78 Accepts]: Start accepts. Automaton has 1679 states and 5882 transitions. Word has length 24 [2021-07-13 19:58:11,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:11,740 INFO L482 AbstractCegarLoop]: Abstraction has 1679 states and 5882 transitions. [2021-07-13 19:58:11,740 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:11,741 INFO L276 IsEmpty]: Start isEmpty. Operand 1679 states and 5882 transitions. [2021-07-13 19:58:11,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:11,743 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:11,743 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:11,943 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable318,179 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:11,944 INFO L430 AbstractCegarLoop]: === Iteration 191 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:11,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:11,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1231829788, now seen corresponding path program 77 times [2021-07-13 19:58:11,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:11,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980198116] [2021-07-13 19:58:11,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:11,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:12,135 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:12,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:12,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980198116] [2021-07-13 19:58:12,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980198116] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:12,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628514463] [2021-07-13 19:58:12,135 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 180 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 180 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:12,163 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-07-13 19:58:12,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:12,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:12,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:12,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:12,289 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:12,291 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:12,292 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:12,292 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:12,342 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:12,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628514463] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:12,342 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:12,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:12,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650727215] [2021-07-13 19:58:12,342 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:12,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:12,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:12,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:12,343 INFO L87 Difference]: Start difference. First operand 1679 states and 5882 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:13,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:13,432 INFO L93 Difference]: Finished difference Result 2149 states and 7324 transitions. [2021-07-13 19:58:13,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 19:58:13,432 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:13,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:13,436 INFO L225 Difference]: With dead ends: 2149 [2021-07-13 19:58:13,436 INFO L226 Difference]: Without dead ends: 2123 [2021-07-13 19:58:13,436 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 921.2ms TimeCoverageRelationStatistics Valid=272, Invalid=1534, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:58:13,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2123 states. [2021-07-13 19:58:13,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2123 to 1671. [2021-07-13 19:58:13,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1671 states, 1670 states have (on average 3.507185628742515) internal successors, (5857), 1670 states have internal predecessors, (5857), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:13,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1671 states to 1671 states and 5857 transitions. [2021-07-13 19:58:13,464 INFO L78 Accepts]: Start accepts. Automaton has 1671 states and 5857 transitions. Word has length 24 [2021-07-13 19:58:13,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:13,464 INFO L482 AbstractCegarLoop]: Abstraction has 1671 states and 5857 transitions. [2021-07-13 19:58:13,465 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:13,465 INFO L276 IsEmpty]: Start isEmpty. Operand 1671 states and 5857 transitions. [2021-07-13 19:58:13,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:13,468 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:13,468 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:13,671 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable319,180 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:13,672 INFO L430 AbstractCegarLoop]: === Iteration 192 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:13,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:13,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1241517520, now seen corresponding path program 80 times [2021-07-13 19:58:13,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:13,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925449004] [2021-07-13 19:58:13,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:13,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:13,871 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:13,871 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:13,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925449004] [2021-07-13 19:58:13,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925449004] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:13,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680818535] [2021-07-13 19:58:13,871 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 181 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 181 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:13,898 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:58:13,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:13,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:58:13,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:14,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:58:14,119 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:58:14,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:58:14,120 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:14,126 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:14,127 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:14,127 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:58:14,172 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:14,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680818535] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:14,172 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:14,172 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:58:14,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054640593] [2021-07-13 19:58:14,173 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:58:14,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:14,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:58:14,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:58:14,173 INFO L87 Difference]: Start difference. First operand 1671 states and 5857 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:15,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:15,659 INFO L93 Difference]: Finished difference Result 2325 states and 7797 transitions. [2021-07-13 19:58:15,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-07-13 19:58:15,659 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:15,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:15,663 INFO L225 Difference]: With dead ends: 2325 [2021-07-13 19:58:15,663 INFO L226 Difference]: Without dead ends: 2275 [2021-07-13 19:58:15,663 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 1287.8ms TimeCoverageRelationStatistics Valid=359, Invalid=2191, Unknown=0, NotChecked=0, Total=2550 [2021-07-13 19:58:15,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2275 states. [2021-07-13 19:58:15,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2275 to 1674. [2021-07-13 19:58:15,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1674 states, 1673 states have (on average 3.5068738792588166) internal successors, (5867), 1673 states have internal predecessors, (5867), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:15,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1674 states to 1674 states and 5867 transitions. [2021-07-13 19:58:15,688 INFO L78 Accepts]: Start accepts. Automaton has 1674 states and 5867 transitions. Word has length 24 [2021-07-13 19:58:15,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:15,688 INFO L482 AbstractCegarLoop]: Abstraction has 1674 states and 5867 transitions. [2021-07-13 19:58:15,688 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:15,688 INFO L276 IsEmpty]: Start isEmpty. Operand 1674 states and 5867 transitions. [2021-07-13 19:58:15,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:15,691 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:15,691 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:15,892 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 181 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable320 [2021-07-13 19:58:15,893 INFO L430 AbstractCegarLoop]: === Iteration 193 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:15,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:15,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1324778030, now seen corresponding path program 81 times [2021-07-13 19:58:15,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:15,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031145490] [2021-07-13 19:58:15,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:15,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:16,150 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:16,150 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:16,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031145490] [2021-07-13 19:58:16,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031145490] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:16,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202932845] [2021-07-13 19:58:16,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 182 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 182 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:16,191 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:58:16,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:16,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:58:16,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:16,402 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:16,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:58:16,404 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:16,414 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:16,415 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:16,416 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 19:58:16,503 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:16,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202932845] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:16,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:16,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:58:16,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685098684] [2021-07-13 19:58:16,503 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:58:16,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:16,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:58:16,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:58:16,504 INFO L87 Difference]: Start difference. First operand 1674 states and 5867 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:16,887 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 57 [2021-07-13 19:58:19,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:19,162 INFO L93 Difference]: Finished difference Result 2304 states and 7763 transitions. [2021-07-13 19:58:19,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-07-13 19:58:19,162 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:19,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:19,167 INFO L225 Difference]: With dead ends: 2304 [2021-07-13 19:58:19,167 INFO L226 Difference]: Without dead ends: 2265 [2021-07-13 19:58:19,167 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1086 ImplicationChecksByTransitivity, 2359.3ms TimeCoverageRelationStatistics Valid=579, Invalid=3327, Unknown=0, NotChecked=0, Total=3906 [2021-07-13 19:58:19,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2265 states. [2021-07-13 19:58:19,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2265 to 1677. [2021-07-13 19:58:19,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1677 states, 1676 states have (on average 3.506563245823389) internal successors, (5877), 1676 states have internal predecessors, (5877), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:19,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1677 states to 1677 states and 5877 transitions. [2021-07-13 19:58:19,191 INFO L78 Accepts]: Start accepts. Automaton has 1677 states and 5877 transitions. Word has length 24 [2021-07-13 19:58:19,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:19,191 INFO L482 AbstractCegarLoop]: Abstraction has 1677 states and 5877 transitions. [2021-07-13 19:58:19,191 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:19,191 INFO L276 IsEmpty]: Start isEmpty. Operand 1677 states and 5877 transitions. [2021-07-13 19:58:19,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:19,193 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:19,193 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:19,393 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable321,182 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:19,394 INFO L430 AbstractCegarLoop]: === Iteration 194 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:19,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:19,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1942039406, now seen corresponding path program 82 times [2021-07-13 19:58:19,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:19,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514784279] [2021-07-13 19:58:19,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:19,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:19,557 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:19,557 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:19,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514784279] [2021-07-13 19:58:19,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514784279] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:19,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676156778] [2021-07-13 19:58:19,558 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 183 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 183 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:19,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:58:19,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:19,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:19,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:19,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:19,712 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:19,715 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:19,715 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:19,715 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:19,761 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:19,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676156778] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:19,762 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:19,762 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:19,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825776788] [2021-07-13 19:58:19,762 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:19,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:19,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:19,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:19,763 INFO L87 Difference]: Start difference. First operand 1677 states and 5877 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:20,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:20,971 INFO L93 Difference]: Finished difference Result 2148 states and 7323 transitions. [2021-07-13 19:58:20,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-07-13 19:58:20,971 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:20,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:20,975 INFO L225 Difference]: With dead ends: 2148 [2021-07-13 19:58:20,975 INFO L226 Difference]: Without dead ends: 2122 [2021-07-13 19:58:20,975 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 979.1ms TimeCoverageRelationStatistics Valid=329, Invalid=1651, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 19:58:20,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2122 states. [2021-07-13 19:58:20,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2122 to 1680. [2021-07-13 19:58:20,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1680 states, 1679 states have (on average 3.5050625372245383) internal successors, (5885), 1679 states have internal predecessors, (5885), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:20,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1680 states to 1680 states and 5885 transitions. [2021-07-13 19:58:20,997 INFO L78 Accepts]: Start accepts. Automaton has 1680 states and 5885 transitions. Word has length 24 [2021-07-13 19:58:20,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:20,998 INFO L482 AbstractCegarLoop]: Abstraction has 1680 states and 5885 transitions. [2021-07-13 19:58:20,998 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:20,998 INFO L276 IsEmpty]: Start isEmpty. Operand 1680 states and 5885 transitions. [2021-07-13 19:58:21,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:21,000 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:21,000 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:21,200 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 183 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable324 [2021-07-13 19:58:21,201 INFO L430 AbstractCegarLoop]: === Iteration 195 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:21,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:21,201 INFO L82 PathProgramCache]: Analyzing trace with hash -2029341712, now seen corresponding path program 83 times [2021-07-13 19:58:21,201 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:21,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [609954405] [2021-07-13 19:58:21,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:21,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:21,366 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:21,366 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:21,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [609954405] [2021-07-13 19:58:21,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [609954405] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:21,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81789749] [2021-07-13 19:58:21,367 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 184 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 184 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:21,393 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:58:21,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:21,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:21,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:21,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:21,530 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:21,533 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:21,533 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:21,533 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:21,580 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:21,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81789749] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:21,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:21,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:21,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265229790] [2021-07-13 19:58:21,581 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:21,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:21,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:21,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:21,581 INFO L87 Difference]: Start difference. First operand 1680 states and 5885 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:22,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:22,528 INFO L93 Difference]: Finished difference Result 2123 states and 7249 transitions. [2021-07-13 19:58:22,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-13 19:58:22,528 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:22,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:22,532 INFO L225 Difference]: With dead ends: 2123 [2021-07-13 19:58:22,532 INFO L226 Difference]: Without dead ends: 2098 [2021-07-13 19:58:22,532 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 832.7ms TimeCoverageRelationStatistics Valid=234, Invalid=1248, Unknown=0, NotChecked=0, Total=1482 [2021-07-13 19:58:22,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2098 states. [2021-07-13 19:58:22,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2098 to 1671. [2021-07-13 19:58:22,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1671 states, 1670 states have (on average 3.507185628742515) internal successors, (5857), 1670 states have internal predecessors, (5857), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:22,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1671 states to 1671 states and 5857 transitions. [2021-07-13 19:58:22,569 INFO L78 Accepts]: Start accepts. Automaton has 1671 states and 5857 transitions. Word has length 24 [2021-07-13 19:58:22,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:22,569 INFO L482 AbstractCegarLoop]: Abstraction has 1671 states and 5857 transitions. [2021-07-13 19:58:22,569 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:22,569 INFO L276 IsEmpty]: Start isEmpty. Operand 1671 states and 5857 transitions. [2021-07-13 19:58:22,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:22,571 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:22,571 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:22,772 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 184 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable325 [2021-07-13 19:58:22,772 INFO L430 AbstractCegarLoop]: === Iteration 196 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:22,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:22,772 INFO L82 PathProgramCache]: Analyzing trace with hash -738169602, now seen corresponding path program 78 times [2021-07-13 19:58:22,772 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:22,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173410658] [2021-07-13 19:58:22,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:22,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:22,955 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:22,955 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:22,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173410658] [2021-07-13 19:58:22,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [173410658] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:22,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031902195] [2021-07-13 19:58:22,955 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 185 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 185 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:22,983 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:58:22,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:22,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:22,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:23,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:58:23,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:58:23,191 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:23,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 40 [2021-07-13 19:58:23,195 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:58:23,221 INFO L628 ElimStorePlain]: treesize reduction 31, result has 44.6 percent of original size [2021-07-13 19:58:23,224 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:23,224 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:19 [2021-07-13 19:58:23,292 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:23,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031902195] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:23,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:23,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:58:23,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106418107] [2021-07-13 19:58:23,293 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:58:23,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:23,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:58:23,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:58:23,293 INFO L87 Difference]: Start difference. First operand 1671 states and 5857 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:25,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:25,714 INFO L93 Difference]: Finished difference Result 2486 states and 8299 transitions. [2021-07-13 19:58:25,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-07-13 19:58:25,715 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:25,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:25,719 INFO L225 Difference]: With dead ends: 2486 [2021-07-13 19:58:25,719 INFO L226 Difference]: Without dead ends: 2396 [2021-07-13 19:58:25,719 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 1677.5ms TimeCoverageRelationStatistics Valid=418, Invalid=2774, Unknown=0, NotChecked=0, Total=3192 [2021-07-13 19:58:25,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2396 states. [2021-07-13 19:58:25,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2396 to 1686. [2021-07-13 19:58:25,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1686 states, 1685 states have (on average 3.5050445103857566) internal successors, (5906), 1685 states have internal predecessors, (5906), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:25,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1686 states to 1686 states and 5906 transitions. [2021-07-13 19:58:25,744 INFO L78 Accepts]: Start accepts. Automaton has 1686 states and 5906 transitions. Word has length 24 [2021-07-13 19:58:25,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:25,744 INFO L482 AbstractCegarLoop]: Abstraction has 1686 states and 5906 transitions. [2021-07-13 19:58:25,744 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:25,744 INFO L276 IsEmpty]: Start isEmpty. Operand 1686 states and 5906 transitions. [2021-07-13 19:58:25,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:25,746 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:25,746 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:25,947 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 185 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable326 [2021-07-13 19:58:25,947 INFO L430 AbstractCegarLoop]: === Iteration 197 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:25,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:25,947 INFO L82 PathProgramCache]: Analyzing trace with hash -520744716, now seen corresponding path program 79 times [2021-07-13 19:58:25,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:25,947 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200781725] [2021-07-13 19:58:25,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:25,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:26,123 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:26,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:26,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200781725] [2021-07-13 19:58:26,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200781725] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:26,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019182606] [2021-07-13 19:58:26,123 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 186 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 186 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:26,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:26,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:26,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:26,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:26,266 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:26,269 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:26,269 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:26,269 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:26,314 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:26,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019182606] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:26,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:26,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:26,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112932988] [2021-07-13 19:58:26,315 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:26,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:26,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:26,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:26,315 INFO L87 Difference]: Start difference. First operand 1686 states and 5906 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:28,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:28,229 INFO L93 Difference]: Finished difference Result 2547 states and 8513 transitions. [2021-07-13 19:58:28,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-07-13 19:58:28,230 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:28,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:28,234 INFO L225 Difference]: With dead ends: 2547 [2021-07-13 19:58:28,234 INFO L226 Difference]: Without dead ends: 2487 [2021-07-13 19:58:28,234 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1028 ImplicationChecksByTransitivity, 1666.7ms TimeCoverageRelationStatistics Valid=611, Invalid=2811, Unknown=0, NotChecked=0, Total=3422 [2021-07-13 19:58:28,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2487 states. [2021-07-13 19:58:28,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2487 to 1726. [2021-07-13 19:58:28,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1726 states, 1725 states have (on average 3.508985507246377) internal successors, (6053), 1725 states have internal predecessors, (6053), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:28,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1726 states to 1726 states and 6053 transitions. [2021-07-13 19:58:28,260 INFO L78 Accepts]: Start accepts. Automaton has 1726 states and 6053 transitions. Word has length 24 [2021-07-13 19:58:28,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:28,260 INFO L482 AbstractCegarLoop]: Abstraction has 1726 states and 6053 transitions. [2021-07-13 19:58:28,260 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:28,260 INFO L276 IsEmpty]: Start isEmpty. Operand 1726 states and 6053 transitions. [2021-07-13 19:58:28,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:28,262 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:28,262 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:28,464 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable330,186 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:28,465 INFO L430 AbstractCegarLoop]: === Iteration 198 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:28,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:28,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1354483156, now seen corresponding path program 80 times [2021-07-13 19:58:28,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:28,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036884285] [2021-07-13 19:58:28,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:28,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:28,653 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:28,653 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:28,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036884285] [2021-07-13 19:58:28,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036884285] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:28,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190187694] [2021-07-13 19:58:28,653 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 187 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 187 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:28,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:58:28,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:28,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:58:28,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:28,815 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:28,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:58:28,816 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:28,826 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:28,826 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:28,826 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:58:28,920 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:28,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190187694] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:28,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:28,920 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:58:28,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138242056] [2021-07-13 19:58:28,921 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:58:28,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:28,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:58:28,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:58:28,921 INFO L87 Difference]: Start difference. First operand 1726 states and 6053 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:30,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:30,878 INFO L93 Difference]: Finished difference Result 2452 states and 8252 transitions. [2021-07-13 19:58:30,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-07-13 19:58:30,878 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:30,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:30,882 INFO L225 Difference]: With dead ends: 2452 [2021-07-13 19:58:30,883 INFO L226 Difference]: Without dead ends: 2401 [2021-07-13 19:58:30,883 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1047 ImplicationChecksByTransitivity, 1711.6ms TimeCoverageRelationStatistics Valid=551, Invalid=2989, Unknown=0, NotChecked=0, Total=3540 [2021-07-13 19:58:30,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2401 states. [2021-07-13 19:58:30,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2401 to 1748. [2021-07-13 19:58:30,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1748 states, 1747 states have (on average 3.5060103033772183) internal successors, (6125), 1747 states have internal predecessors, (6125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:30,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1748 states to 1748 states and 6125 transitions. [2021-07-13 19:58:30,908 INFO L78 Accepts]: Start accepts. Automaton has 1748 states and 6125 transitions. Word has length 24 [2021-07-13 19:58:30,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:30,908 INFO L482 AbstractCegarLoop]: Abstraction has 1748 states and 6125 transitions. [2021-07-13 19:58:30,908 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:30,908 INFO L276 IsEmpty]: Start isEmpty. Operand 1748 states and 6125 transitions. [2021-07-13 19:58:30,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:30,910 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:30,910 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:31,111 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable331,187 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:31,111 INFO L430 AbstractCegarLoop]: === Iteration 199 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:31,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:31,111 INFO L82 PathProgramCache]: Analyzing trace with hash -96000760, now seen corresponding path program 84 times [2021-07-13 19:58:31,111 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:31,111 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75220807] [2021-07-13 19:58:31,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:31,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:31,307 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:31,307 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:31,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75220807] [2021-07-13 19:58:31,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75220807] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:31,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642760068] [2021-07-13 19:58:31,308 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 188 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 188 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:31,334 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:58:31,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:31,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:58:31,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:31,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:58:31,535 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:58:31,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:58:31,536 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:31,540 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:31,541 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:31,541 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:58:31,570 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:31,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1642760068] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:31,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:31,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:58:31,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675548429] [2021-07-13 19:58:31,571 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:58:31,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:31,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:58:31,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:58:31,571 INFO L87 Difference]: Start difference. First operand 1748 states and 6125 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:34,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:34,067 INFO L93 Difference]: Finished difference Result 2604 states and 8741 transitions. [2021-07-13 19:58:34,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-07-13 19:58:34,067 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:34,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:34,072 INFO L225 Difference]: With dead ends: 2604 [2021-07-13 19:58:34,072 INFO L226 Difference]: Without dead ends: 2546 [2021-07-13 19:58:34,073 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1412 ImplicationChecksByTransitivity, 2115.0ms TimeCoverageRelationStatistics Valid=752, Invalid=3940, Unknown=0, NotChecked=0, Total=4692 [2021-07-13 19:58:34,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2546 states. [2021-07-13 19:58:34,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2546 to 1755. [2021-07-13 19:58:34,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1755 states, 1754 states have (on average 3.506841505131129) internal successors, (6151), 1754 states have internal predecessors, (6151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:34,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1755 states to 1755 states and 6151 transitions. [2021-07-13 19:58:34,101 INFO L78 Accepts]: Start accepts. Automaton has 1755 states and 6151 transitions. Word has length 24 [2021-07-13 19:58:34,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:34,101 INFO L482 AbstractCegarLoop]: Abstraction has 1755 states and 6151 transitions. [2021-07-13 19:58:34,101 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:34,101 INFO L276 IsEmpty]: Start isEmpty. Operand 1755 states and 6151 transitions. [2021-07-13 19:58:34,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:34,104 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:34,104 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:34,304 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 188 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable333 [2021-07-13 19:58:34,304 INFO L430 AbstractCegarLoop]: === Iteration 200 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:34,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:34,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1124150620, now seen corresponding path program 85 times [2021-07-13 19:58:34,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:34,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251997833] [2021-07-13 19:58:34,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:34,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:34,479 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:34,479 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:34,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251997833] [2021-07-13 19:58:34,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251997833] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:34,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46140070] [2021-07-13 19:58:34,479 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 189 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 189 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:34,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:34,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:34,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:34,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:34,638 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:34,641 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:34,641 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:34,641 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:34,686 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:34,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46140070] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:34,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:34,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:34,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368535242] [2021-07-13 19:58:34,686 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:34,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:34,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:34,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:34,687 INFO L87 Difference]: Start difference. First operand 1755 states and 6151 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:36,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:36,683 INFO L93 Difference]: Finished difference Result 2476 states and 8372 transitions. [2021-07-13 19:58:36,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-07-13 19:58:36,683 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:36,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:36,688 INFO L225 Difference]: With dead ends: 2476 [2021-07-13 19:58:36,688 INFO L226 Difference]: Without dead ends: 2434 [2021-07-13 19:58:36,689 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 905 ImplicationChecksByTransitivity, 1518.3ms TimeCoverageRelationStatistics Valid=536, Invalid=2544, Unknown=0, NotChecked=0, Total=3080 [2021-07-13 19:58:36,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2434 states. [2021-07-13 19:58:36,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2434 to 1765. [2021-07-13 19:58:36,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1765 states, 1764 states have (on average 3.5051020408163267) internal successors, (6183), 1764 states have internal predecessors, (6183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:36,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1765 states to 1765 states and 6183 transitions. [2021-07-13 19:58:36,715 INFO L78 Accepts]: Start accepts. Automaton has 1765 states and 6183 transitions. Word has length 24 [2021-07-13 19:58:36,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:36,715 INFO L482 AbstractCegarLoop]: Abstraction has 1765 states and 6183 transitions. [2021-07-13 19:58:36,716 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:36,716 INFO L276 IsEmpty]: Start isEmpty. Operand 1765 states and 6183 transitions. [2021-07-13 19:58:36,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:36,718 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:36,718 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:36,918 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 189 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable334 [2021-07-13 19:58:36,919 INFO L430 AbstractCegarLoop]: === Iteration 201 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:36,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:36,919 INFO L82 PathProgramCache]: Analyzing trace with hash -800564442, now seen corresponding path program 86 times [2021-07-13 19:58:36,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:36,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439426779] [2021-07-13 19:58:36,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:36,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:37,094 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:37,094 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:37,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439426779] [2021-07-13 19:58:37,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439426779] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:37,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369693341] [2021-07-13 19:58:37,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 190 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 190 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:37,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:58:37,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:37,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:58:37,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:37,250 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:37,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:58:37,252 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:37,262 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:37,262 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:37,262 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:58:37,356 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:37,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369693341] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:37,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:37,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:58:37,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509187820] [2021-07-13 19:58:37,357 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:58:37,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:37,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:58:37,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:58:37,357 INFO L87 Difference]: Start difference. First operand 1765 states and 6183 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:39,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:39,736 INFO L93 Difference]: Finished difference Result 2476 states and 8307 transitions. [2021-07-13 19:58:39,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-07-13 19:58:39,736 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:39,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:39,740 INFO L225 Difference]: With dead ends: 2476 [2021-07-13 19:58:39,741 INFO L226 Difference]: Without dead ends: 2436 [2021-07-13 19:58:39,741 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1258 ImplicationChecksByTransitivity, 2037.2ms TimeCoverageRelationStatistics Valid=639, Invalid=3393, Unknown=0, NotChecked=0, Total=4032 [2021-07-13 19:58:39,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2436 states. [2021-07-13 19:58:39,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2436 to 1773. [2021-07-13 19:58:39,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1773 states, 1772 states have (on average 3.505079006772009) internal successors, (6211), 1772 states have internal predecessors, (6211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:39,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1773 states to 1773 states and 6211 transitions. [2021-07-13 19:58:39,767 INFO L78 Accepts]: Start accepts. Automaton has 1773 states and 6211 transitions. Word has length 24 [2021-07-13 19:58:39,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:39,767 INFO L482 AbstractCegarLoop]: Abstraction has 1773 states and 6211 transitions. [2021-07-13 19:58:39,767 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:39,767 INFO L276 IsEmpty]: Start isEmpty. Operand 1773 states and 6211 transitions. [2021-07-13 19:58:39,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:39,770 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:39,770 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:39,970 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 190 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable335 [2021-07-13 19:58:39,970 INFO L430 AbstractCegarLoop]: === Iteration 202 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:39,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:39,970 INFO L82 PathProgramCache]: Analyzing trace with hash 885179680, now seen corresponding path program 87 times [2021-07-13 19:58:39,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:39,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772939772] [2021-07-13 19:58:39,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:39,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:40,122 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:40,122 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:40,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772939772] [2021-07-13 19:58:40,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772939772] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:40,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4807685] [2021-07-13 19:58:40,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 191 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 191 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:40,149 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:58:40,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:40,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:40,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:40,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:40,269 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:40,272 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:40,273 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:40,273 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:40,315 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:40,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4807685] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:40,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:40,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:58:40,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763186732] [2021-07-13 19:58:40,316 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:58:40,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:40,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:58:40,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:58:40,316 INFO L87 Difference]: Start difference. First operand 1773 states and 6211 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:41,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:41,870 INFO L93 Difference]: Finished difference Result 2331 states and 7931 transitions. [2021-07-13 19:58:41,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-07-13 19:58:41,870 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:41,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:41,874 INFO L225 Difference]: With dead ends: 2331 [2021-07-13 19:58:41,875 INFO L226 Difference]: Without dead ends: 2310 [2021-07-13 19:58:41,875 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 1301.6ms TimeCoverageRelationStatistics Valid=439, Invalid=2213, Unknown=0, NotChecked=0, Total=2652 [2021-07-13 19:58:41,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2310 states. [2021-07-13 19:58:41,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2310 to 1760. [2021-07-13 19:58:41,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1760 states, 1759 states have (on average 3.505969300739056) internal successors, (6167), 1759 states have internal predecessors, (6167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:41,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1760 states to 1760 states and 6167 transitions. [2021-07-13 19:58:41,899 INFO L78 Accepts]: Start accepts. Automaton has 1760 states and 6167 transitions. Word has length 24 [2021-07-13 19:58:41,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:41,900 INFO L482 AbstractCegarLoop]: Abstraction has 1760 states and 6167 transitions. [2021-07-13 19:58:41,900 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:41,900 INFO L276 IsEmpty]: Start isEmpty. Operand 1760 states and 6167 transitions. [2021-07-13 19:58:41,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:41,902 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:41,902 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:42,102 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 191 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable338 [2021-07-13 19:58:42,103 INFO L430 AbstractCegarLoop]: === Iteration 203 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:42,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:42,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1344157466, now seen corresponding path program 81 times [2021-07-13 19:58:42,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:42,103 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312114484] [2021-07-13 19:58:42,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:42,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:42,277 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:42,277 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:42,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312114484] [2021-07-13 19:58:42,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312114484] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:42,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671672418] [2021-07-13 19:58:42,277 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 192 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 192 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:42,306 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-13 19:58:42,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:42,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 28 conjunts are in the unsatisfiable core [2021-07-13 19:58:42,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:42,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:58:42,452 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:42,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 23 treesize of output 57 [2021-07-13 19:58:42,454 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:42,475 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:42,496 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:42,497 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:350 [2021-07-13 19:58:42,831 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:42,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671672418] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:42,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:42,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:58:42,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082528883] [2021-07-13 19:58:42,832 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:58:42,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:42,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:58:42,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:58:42,832 INFO L87 Difference]: Start difference. First operand 1760 states and 6167 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:43,547 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 39 [2021-07-13 19:58:43,699 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 37 [2021-07-13 19:58:44,766 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 34 [2021-07-13 19:58:46,031 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 36 [2021-07-13 19:58:46,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:46,731 INFO L93 Difference]: Finished difference Result 3383 states and 11252 transitions. [2021-07-13 19:58:46,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-07-13 19:58:46,731 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:46,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:46,738 INFO L225 Difference]: With dead ends: 3383 [2021-07-13 19:58:46,738 INFO L226 Difference]: Without dead ends: 3356 [2021-07-13 19:58:46,738 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1996 ImplicationChecksByTransitivity, 3430.9ms TimeCoverageRelationStatistics Valid=1107, Invalid=5373, Unknown=0, NotChecked=0, Total=6480 [2021-07-13 19:58:46,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3356 states. [2021-07-13 19:58:46,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3356 to 1826. [2021-07-13 19:58:46,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1826 states, 1825 states have (on average 3.530958904109589) internal successors, (6444), 1825 states have internal predecessors, (6444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:46,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1826 states to 1826 states and 6444 transitions. [2021-07-13 19:58:46,770 INFO L78 Accepts]: Start accepts. Automaton has 1826 states and 6444 transitions. Word has length 24 [2021-07-13 19:58:46,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:46,770 INFO L482 AbstractCegarLoop]: Abstraction has 1826 states and 6444 transitions. [2021-07-13 19:58:46,770 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:46,770 INFO L276 IsEmpty]: Start isEmpty. Operand 1826 states and 6444 transitions. [2021-07-13 19:58:46,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:46,772 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:46,772 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:46,973 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable339,192 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:46,973 INFO L430 AbstractCegarLoop]: === Iteration 204 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:46,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:46,973 INFO L82 PathProgramCache]: Analyzing trace with hash -446703708, now seen corresponding path program 82 times [2021-07-13 19:58:46,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:46,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980106871] [2021-07-13 19:58:46,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:46,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:47,141 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:47,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:47,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980106871] [2021-07-13 19:58:47,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980106871] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:47,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579571399] [2021-07-13 19:58:47,142 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 193 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 193 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:47,172 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:58:47,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:47,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:47,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:47,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:47,316 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:47,320 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:47,320 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:47,320 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:47,374 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:47,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579571399] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:47,375 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:47,375 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:47,375 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204241787] [2021-07-13 19:58:47,375 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:47,375 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:47,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:47,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:47,376 INFO L87 Difference]: Start difference. First operand 1826 states and 6444 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:50,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:50,080 INFO L93 Difference]: Finished difference Result 3469 states and 11530 transitions. [2021-07-13 19:58:50,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-07-13 19:58:50,080 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:50,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:50,086 INFO L225 Difference]: With dead ends: 3469 [2021-07-13 19:58:50,086 INFO L226 Difference]: Without dead ends: 3411 [2021-07-13 19:58:50,087 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2250 ImplicationChecksByTransitivity, 2217.6ms TimeCoverageRelationStatistics Valid=1048, Invalid=5432, Unknown=0, NotChecked=0, Total=6480 [2021-07-13 19:58:50,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3411 states. [2021-07-13 19:58:50,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3411 to 1859. [2021-07-13 19:58:50,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1859 states, 1858 states have (on average 3.5441334768568353) internal successors, (6585), 1858 states have internal predecessors, (6585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:50,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1859 states to 1859 states and 6585 transitions. [2021-07-13 19:58:50,121 INFO L78 Accepts]: Start accepts. Automaton has 1859 states and 6585 transitions. Word has length 24 [2021-07-13 19:58:50,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:50,121 INFO L482 AbstractCegarLoop]: Abstraction has 1859 states and 6585 transitions. [2021-07-13 19:58:50,121 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:50,121 INFO L276 IsEmpty]: Start isEmpty. Operand 1859 states and 6585 transitions. [2021-07-13 19:58:50,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:50,124 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:50,124 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:50,324 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable350,193 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:50,324 INFO L430 AbstractCegarLoop]: === Iteration 205 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:50,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:50,325 INFO L82 PathProgramCache]: Analyzing trace with hash -713337392, now seen corresponding path program 88 times [2021-07-13 19:58:50,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:50,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463432686] [2021-07-13 19:58:50,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:50,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:50,477 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:50,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:50,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463432686] [2021-07-13 19:58:50,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463432686] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:50,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268238302] [2021-07-13 19:58:50,478 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 194 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 194 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:50,506 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:58:50,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:50,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:50,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:50,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:50,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:50,626 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:50,627 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:50,627 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:50,676 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:50,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268238302] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:50,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:50,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:50,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190716137] [2021-07-13 19:58:50,676 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:50,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:50,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:50,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:50,677 INFO L87 Difference]: Start difference. First operand 1859 states and 6585 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:53,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:53,099 INFO L93 Difference]: Finished difference Result 3517 states and 11694 transitions. [2021-07-13 19:58:53,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-07-13 19:58:53,099 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:53,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:53,107 INFO L225 Difference]: With dead ends: 3517 [2021-07-13 19:58:53,107 INFO L226 Difference]: Without dead ends: 3467 [2021-07-13 19:58:53,107 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1761 ImplicationChecksByTransitivity, 1987.0ms TimeCoverageRelationStatistics Valid=938, Invalid=4318, Unknown=0, NotChecked=0, Total=5256 [2021-07-13 19:58:53,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3467 states. [2021-07-13 19:58:53,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3467 to 1918. [2021-07-13 19:58:53,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1918 states, 1917 states have (on average 3.5701617110067816) internal successors, (6844), 1917 states have internal predecessors, (6844), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:53,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1918 states to 1918 states and 6844 transitions. [2021-07-13 19:58:53,148 INFO L78 Accepts]: Start accepts. Automaton has 1918 states and 6844 transitions. Word has length 24 [2021-07-13 19:58:53,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:53,148 INFO L482 AbstractCegarLoop]: Abstraction has 1918 states and 6844 transitions. [2021-07-13 19:58:53,148 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:53,148 INFO L276 IsEmpty]: Start isEmpty. Operand 1918 states and 6844 transitions. [2021-07-13 19:58:53,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:53,151 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:53,151 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:53,351 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable351,194 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:53,352 INFO L430 AbstractCegarLoop]: === Iteration 206 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:53,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:53,352 INFO L82 PathProgramCache]: Analyzing trace with hash -389751214, now seen corresponding path program 89 times [2021-07-13 19:58:53,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:53,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093195092] [2021-07-13 19:58:53,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:53,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:53,525 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:53,526 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:53,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093195092] [2021-07-13 19:58:53,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093195092] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:53,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333361128] [2021-07-13 19:58:53,526 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 195 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 195 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:53,552 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:58:53,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:53,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:53,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:53,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:58:53,691 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:53,694 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:53,694 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:53,694 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:58:53,758 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:53,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333361128] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:53,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:53,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:53,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332035675] [2021-07-13 19:58:53,758 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:53,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:53,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:53,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:53,759 INFO L87 Difference]: Start difference. First operand 1918 states and 6844 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:55,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:55,994 INFO L93 Difference]: Finished difference Result 3345 states and 11284 transitions. [2021-07-13 19:58:55,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-07-13 19:58:55,994 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:55,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:56,001 INFO L225 Difference]: With dead ends: 3345 [2021-07-13 19:58:56,001 INFO L226 Difference]: Without dead ends: 3302 [2021-07-13 19:58:56,002 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1538 ImplicationChecksByTransitivity, 1842.5ms TimeCoverageRelationStatistics Valid=813, Invalid=3879, Unknown=0, NotChecked=0, Total=4692 [2021-07-13 19:58:56,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3302 states. [2021-07-13 19:58:56,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3302 to 1924. [2021-07-13 19:58:56,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1924 states, 1923 states have (on average 3.578263130525221) internal successors, (6881), 1923 states have internal predecessors, (6881), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:56,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1924 states to 1924 states and 6881 transitions. [2021-07-13 19:58:56,036 INFO L78 Accepts]: Start accepts. Automaton has 1924 states and 6881 transitions. Word has length 24 [2021-07-13 19:58:56,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:56,036 INFO L482 AbstractCegarLoop]: Abstraction has 1924 states and 6881 transitions. [2021-07-13 19:58:56,036 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:56,037 INFO L276 IsEmpty]: Start isEmpty. Operand 1924 states and 6881 transitions. [2021-07-13 19:58:56,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:56,039 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:56,039 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:56,239 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 195 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable352 [2021-07-13 19:58:56,240 INFO L430 AbstractCegarLoop]: === Iteration 207 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:56,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:56,240 INFO L82 PathProgramCache]: Analyzing trace with hash 147171454, now seen corresponding path program 83 times [2021-07-13 19:58:56,240 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:56,240 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833257444] [2021-07-13 19:58:56,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:56,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:56,410 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:56,410 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:56,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833257444] [2021-07-13 19:58:56,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833257444] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:56,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53327165] [2021-07-13 19:58:56,410 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 196 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 196 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:56,437 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-07-13 19:58:56,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:56,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:58:56,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:56,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:58:56,565 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:56,567 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:56,567 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:56,567 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:58:56,601 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:56,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53327165] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:56,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:56,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:58:56,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83204735] [2021-07-13 19:58:56,602 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:58:56,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:56,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:58:56,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:58:56,602 INFO L87 Difference]: Start difference. First operand 1924 states and 6881 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:59,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:58:59,206 INFO L93 Difference]: Finished difference Result 3554 states and 12008 transitions. [2021-07-13 19:58:59,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-07-13 19:58:59,206 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:58:59,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:58:59,213 INFO L225 Difference]: With dead ends: 3554 [2021-07-13 19:58:59,213 INFO L226 Difference]: Without dead ends: 3506 [2021-07-13 19:58:59,214 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1602 ImplicationChecksByTransitivity, 2039.6ms TimeCoverageRelationStatistics Valid=855, Invalid=3975, Unknown=0, NotChecked=0, Total=4830 [2021-07-13 19:58:59,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3506 states. [2021-07-13 19:58:59,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3506 to 1958. [2021-07-13 19:58:59,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1958 states, 1957 states have (on average 3.601430761369443) internal successors, (7048), 1957 states have internal predecessors, (7048), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:59,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1958 states to 1958 states and 7048 transitions. [2021-07-13 19:58:59,249 INFO L78 Accepts]: Start accepts. Automaton has 1958 states and 7048 transitions. Word has length 24 [2021-07-13 19:58:59,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:58:59,249 INFO L482 AbstractCegarLoop]: Abstraction has 1958 states and 7048 transitions. [2021-07-13 19:58:59,249 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:58:59,250 INFO L276 IsEmpty]: Start isEmpty. Operand 1958 states and 7048 transitions. [2021-07-13 19:58:59,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:58:59,252 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:58:59,252 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:58:59,452 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 196 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable353 [2021-07-13 19:58:59,453 INFO L430 AbstractCegarLoop]: === Iteration 208 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:58:59,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:58:59,453 INFO L82 PathProgramCache]: Analyzing trace with hash -57746680, now seen corresponding path program 90 times [2021-07-13 19:58:59,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:58:59,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224900331] [2021-07-13 19:58:59,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:58:59,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:58:59,614 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:59,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:58:59,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224900331] [2021-07-13 19:58:59,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224900331] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:59,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935464909] [2021-07-13 19:58:59,614 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 197 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 197 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:58:59,641 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:58:59,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:58:59,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:58:59,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:58:59,784 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:59,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:58:59,785 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:58:59,795 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:58:59,795 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:58:59,795 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:27 [2021-07-13 19:58:59,870 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:58:59,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935464909] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:58:59,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:58:59,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:58:59,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675099297] [2021-07-13 19:58:59,871 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:58:59,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:58:59,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:58:59,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:58:59,871 INFO L87 Difference]: Start difference. First operand 1958 states and 7048 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:02,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:02,921 INFO L93 Difference]: Finished difference Result 3437 states and 11640 transitions. [2021-07-13 19:59:02,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-07-13 19:59:02,922 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:02,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:02,928 INFO L225 Difference]: With dead ends: 3437 [2021-07-13 19:59:02,929 INFO L226 Difference]: Without dead ends: 3407 [2021-07-13 19:59:02,929 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1979 ImplicationChecksByTransitivity, 2639.3ms TimeCoverageRelationStatistics Valid=1021, Invalid=4831, Unknown=0, NotChecked=0, Total=5852 [2021-07-13 19:59:02,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3407 states. [2021-07-13 19:59:02,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3407 to 1969. [2021-07-13 19:59:02,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1969 states, 1968 states have (on average 3.608739837398374) internal successors, (7102), 1968 states have internal predecessors, (7102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:02,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1969 states to 1969 states and 7102 transitions. [2021-07-13 19:59:02,964 INFO L78 Accepts]: Start accepts. Automaton has 1969 states and 7102 transitions. Word has length 24 [2021-07-13 19:59:02,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:02,964 INFO L482 AbstractCegarLoop]: Abstraction has 1969 states and 7102 transitions. [2021-07-13 19:59:02,964 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:02,964 INFO L276 IsEmpty]: Start isEmpty. Operand 1969 states and 7102 transitions. [2021-07-13 19:59:02,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:02,967 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:02,967 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:03,167 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 197 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable354 [2021-07-13 19:59:03,167 INFO L430 AbstractCegarLoop]: === Iteration 209 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:03,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:03,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1627997442, now seen corresponding path program 91 times [2021-07-13 19:59:03,168 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:03,168 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063002799] [2021-07-13 19:59:03,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:03,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:03,326 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:03,326 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:03,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063002799] [2021-07-13 19:59:03,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063002799] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:03,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471213204] [2021-07-13 19:59:03,327 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 198 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 198 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:03,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:03,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:03,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:03,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:03,486 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:03,487 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:03,487 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:03,487 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:59:03,518 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:03,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471213204] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:03,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:03,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:59:03,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155766486] [2021-07-13 19:59:03,518 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:59:03,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:03,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:59:03,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:59:03,519 INFO L87 Difference]: Start difference. First operand 1969 states and 7102 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:05,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:05,720 INFO L93 Difference]: Finished difference Result 3267 states and 11097 transitions. [2021-07-13 19:59:05,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-07-13 19:59:05,721 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:05,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:05,727 INFO L225 Difference]: With dead ends: 3267 [2021-07-13 19:59:05,728 INFO L226 Difference]: Without dead ends: 3232 [2021-07-13 19:59:05,728 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1155 ImplicationChecksByTransitivity, 1649.8ms TimeCoverageRelationStatistics Valid=656, Invalid=3004, Unknown=0, NotChecked=0, Total=3660 [2021-07-13 19:59:05,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3232 states. [2021-07-13 19:59:05,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3232 to 1969. [2021-07-13 19:59:05,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1969 states, 1968 states have (on average 3.608739837398374) internal successors, (7102), 1968 states have internal predecessors, (7102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:05,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1969 states to 1969 states and 7102 transitions. [2021-07-13 19:59:05,763 INFO L78 Accepts]: Start accepts. Automaton has 1969 states and 7102 transitions. Word has length 24 [2021-07-13 19:59:05,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:05,763 INFO L482 AbstractCegarLoop]: Abstraction has 1969 states and 7102 transitions. [2021-07-13 19:59:05,763 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:05,764 INFO L276 IsEmpty]: Start isEmpty. Operand 1969 states and 7102 transitions. [2021-07-13 19:59:05,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:05,766 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:05,766 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:05,967 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 198 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable357 [2021-07-13 19:59:05,967 INFO L430 AbstractCegarLoop]: === Iteration 210 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:05,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:05,967 INFO L82 PathProgramCache]: Analyzing trace with hash -634589398, now seen corresponding path program 92 times [2021-07-13 19:59:05,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:05,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60759756] [2021-07-13 19:59:05,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:05,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:06,149 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:06,150 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:06,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60759756] [2021-07-13 19:59:06,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60759756] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:06,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118811761] [2021-07-13 19:59:06,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 199 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 199 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:06,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:59:06,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:06,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:06,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:06,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:59:06,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:59:06,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:06,427 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:06,431 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:06,432 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:06,432 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:59:06,464 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:06,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118811761] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:06,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:06,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:59:06,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117505702] [2021-07-13 19:59:06,465 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:59:06,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:06,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:59:06,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:59:06,465 INFO L87 Difference]: Start difference. First operand 1969 states and 7102 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:07,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:07,437 INFO L93 Difference]: Finished difference Result 2469 states and 8641 transitions. [2021-07-13 19:59:07,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 19:59:07,437 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:07,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:07,442 INFO L225 Difference]: With dead ends: 2469 [2021-07-13 19:59:07,442 INFO L226 Difference]: Without dead ends: 2460 [2021-07-13 19:59:07,442 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 838.6ms TimeCoverageRelationStatistics Valid=248, Invalid=1474, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:59:07,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2460 states. [2021-07-13 19:59:07,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2460 to 1973. [2021-07-13 19:59:07,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1973 states, 1972 states have (on average 3.6080121703853956) internal successors, (7115), 1972 states have internal predecessors, (7115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:07,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1973 states to 1973 states and 7115 transitions. [2021-07-13 19:59:07,475 INFO L78 Accepts]: Start accepts. Automaton has 1973 states and 7115 transitions. Word has length 24 [2021-07-13 19:59:07,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:07,475 INFO L482 AbstractCegarLoop]: Abstraction has 1973 states and 7115 transitions. [2021-07-13 19:59:07,475 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:07,475 INFO L276 IsEmpty]: Start isEmpty. Operand 1973 states and 7115 transitions. [2021-07-13 19:59:07,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:07,478 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:07,478 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:07,678 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable358,199 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:07,678 INFO L430 AbstractCegarLoop]: === Iteration 211 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:07,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:07,679 INFO L82 PathProgramCache]: Analyzing trace with hash -844126778, now seen corresponding path program 93 times [2021-07-13 19:59:07,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:07,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81353215] [2021-07-13 19:59:07,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:07,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:07,911 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:07,911 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:07,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81353215] [2021-07-13 19:59:07,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81353215] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:07,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940921763] [2021-07-13 19:59:07,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 200 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 200 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:07,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:59:07,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:07,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:07,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:08,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:08,094 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:08,096 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:08,096 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:08,096 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:59:08,126 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:08,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940921763] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:08,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:08,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:59:08,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023522917] [2021-07-13 19:59:08,126 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:08,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:08,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:08,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:08,127 INFO L87 Difference]: Start difference. First operand 1973 states and 7115 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:09,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:09,394 INFO L93 Difference]: Finished difference Result 2516 states and 8793 transitions. [2021-07-13 19:59:09,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:59:09,395 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:09,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:09,399 INFO L225 Difference]: With dead ends: 2516 [2021-07-13 19:59:09,399 INFO L226 Difference]: Without dead ends: 2497 [2021-07-13 19:59:09,399 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 994.8ms TimeCoverageRelationStatistics Valid=289, Invalid=1603, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 19:59:09,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2497 states. [2021-07-13 19:59:09,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2497 to 1976. [2021-07-13 19:59:09,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1976 states, 1975 states have (on average 3.607594936708861) internal successors, (7125), 1975 states have internal predecessors, (7125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:09,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1976 states to 1976 states and 7125 transitions. [2021-07-13 19:59:09,430 INFO L78 Accepts]: Start accepts. Automaton has 1976 states and 7125 transitions. Word has length 24 [2021-07-13 19:59:09,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:09,430 INFO L482 AbstractCegarLoop]: Abstraction has 1976 states and 7125 transitions. [2021-07-13 19:59:09,430 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:09,430 INFO L276 IsEmpty]: Start isEmpty. Operand 1976 states and 7125 transitions. [2021-07-13 19:59:09,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:09,432 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:09,432 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:09,633 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 200 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable359 [2021-07-13 19:59:09,633 INFO L430 AbstractCegarLoop]: === Iteration 212 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:09,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:09,633 INFO L82 PathProgramCache]: Analyzing trace with hash 884544968, now seen corresponding path program 94 times [2021-07-13 19:59:09,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:09,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939317179] [2021-07-13 19:59:09,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:09,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:09,840 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:09,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:09,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939317179] [2021-07-13 19:59:09,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939317179] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:09,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594600855] [2021-07-13 19:59:09,840 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 201 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 201 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:09,868 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:59:09,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:09,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:09,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:10,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:10,024 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:10,026 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:10,026 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:10,026 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 19:59:10,055 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:10,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594600855] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:10,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:10,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:59:10,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108418375] [2021-07-13 19:59:10,055 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:10,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:10,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:10,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:10,056 INFO L87 Difference]: Start difference. First operand 1976 states and 7125 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:11,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:11,203 INFO L93 Difference]: Finished difference Result 2478 states and 8683 transitions. [2021-07-13 19:59:11,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:59:11,203 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:11,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:11,208 INFO L225 Difference]: With dead ends: 2478 [2021-07-13 19:59:11,208 INFO L226 Difference]: Without dead ends: 2459 [2021-07-13 19:59:11,208 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 935.4ms TimeCoverageRelationStatistics Valid=282, Invalid=1524, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:59:11,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2459 states. [2021-07-13 19:59:11,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2459 to 1979. [2021-07-13 19:59:11,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1979 states, 1978 states have (on average 3.6071789686552074) internal successors, (7135), 1978 states have internal predecessors, (7135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:11,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1979 states to 1979 states and 7135 transitions. [2021-07-13 19:59:11,236 INFO L78 Accepts]: Start accepts. Automaton has 1979 states and 7135 transitions. Word has length 24 [2021-07-13 19:59:11,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:11,236 INFO L482 AbstractCegarLoop]: Abstraction has 1979 states and 7135 transitions. [2021-07-13 19:59:11,236 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:11,236 INFO L276 IsEmpty]: Start isEmpty. Operand 1979 states and 7135 transitions. [2021-07-13 19:59:11,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:11,239 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:11,239 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:11,439 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable360,201 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:11,440 INFO L430 AbstractCegarLoop]: === Iteration 213 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:11,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:11,440 INFO L82 PathProgramCache]: Analyzing trace with hash -143604892, now seen corresponding path program 95 times [2021-07-13 19:59:11,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:11,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336259812] [2021-07-13 19:59:11,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:11,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:11,609 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:11,610 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:11,610 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336259812] [2021-07-13 19:59:11,610 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336259812] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:11,610 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307671312] [2021-07-13 19:59:11,610 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 202 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 202 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:11,637 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:59:11,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:11,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:11,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:11,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:11,775 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:11,778 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:11,779 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:11,779 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:11,825 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:11,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307671312] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:11,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:11,826 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:11,826 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944209023] [2021-07-13 19:59:11,826 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:11,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:11,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:11,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:11,826 INFO L87 Difference]: Start difference. First operand 1979 states and 7135 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:12,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:12,695 INFO L93 Difference]: Finished difference Result 2450 states and 8602 transitions. [2021-07-13 19:59:12,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:59:12,696 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:12,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:12,700 INFO L225 Difference]: With dead ends: 2450 [2021-07-13 19:59:12,700 INFO L226 Difference]: Without dead ends: 2441 [2021-07-13 19:59:12,700 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 724.3ms TimeCoverageRelationStatistics Valid=247, Invalid=1159, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 19:59:12,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2441 states. [2021-07-13 19:59:12,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2441 to 1982. [2021-07-13 19:59:12,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1982 states, 1981 states have (on average 3.606764260474508) internal successors, (7145), 1981 states have internal predecessors, (7145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:12,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1982 states to 1982 states and 7145 transitions. [2021-07-13 19:59:12,729 INFO L78 Accepts]: Start accepts. Automaton has 1982 states and 7145 transitions. Word has length 24 [2021-07-13 19:59:12,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:12,729 INFO L482 AbstractCegarLoop]: Abstraction has 1982 states and 7145 transitions. [2021-07-13 19:59:12,729 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:12,729 INFO L276 IsEmpty]: Start isEmpty. Operand 1982 states and 7145 transitions. [2021-07-13 19:59:12,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:12,731 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:12,732 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:12,932 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable361,202 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:12,932 INFO L430 AbstractCegarLoop]: === Iteration 214 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:12,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:12,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1865725408, now seen corresponding path program 96 times [2021-07-13 19:59:12,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:12,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915117066] [2021-07-13 19:59:12,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:12,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:13,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:13,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:13,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915117066] [2021-07-13 19:59:13,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915117066] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:13,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931077376] [2021-07-13 19:59:13,106 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 203 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 203 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:13,133 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:59:13,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:13,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 28 conjunts are in the unsatisfiable core [2021-07-13 19:59:13,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:13,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:59:13,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:59:13,319 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:13,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 23 treesize of output 49 [2021-07-13 19:59:13,321 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:13,340 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:13,356 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-07-13 19:59:13,357 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:39, output treesize:118 [2021-07-13 19:59:13,465 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:13,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931077376] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:13,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:13,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 23 [2021-07-13 19:59:13,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547158133] [2021-07-13 19:59:13,466 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:13,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:13,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:13,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:13,466 INFO L87 Difference]: Start difference. First operand 1982 states and 7145 transitions. Second operand has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:14,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:14,607 INFO L93 Difference]: Finished difference Result 2366 states and 8334 transitions. [2021-07-13 19:59:14,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:59:14,608 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:14,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:14,612 INFO L225 Difference]: With dead ends: 2366 [2021-07-13 19:59:14,612 INFO L226 Difference]: Without dead ends: 2353 [2021-07-13 19:59:14,612 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1029.7ms TimeCoverageRelationStatistics Valid=300, Invalid=1592, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 19:59:14,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2353 states. [2021-07-13 19:59:14,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2353 to 1974. [2021-07-13 19:59:14,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1974 states, 1973 states have (on average 3.6097313735428282) internal successors, (7122), 1973 states have internal predecessors, (7122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:14,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1974 states to 1974 states and 7122 transitions. [2021-07-13 19:59:14,640 INFO L78 Accepts]: Start accepts. Automaton has 1974 states and 7122 transitions. Word has length 24 [2021-07-13 19:59:14,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:14,640 INFO L482 AbstractCegarLoop]: Abstraction has 1974 states and 7122 transitions. [2021-07-13 19:59:14,640 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:14,640 INFO L276 IsEmpty]: Start isEmpty. Operand 1974 states and 7122 transitions. [2021-07-13 19:59:14,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:14,643 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:14,643 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:14,843 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable362,203 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:14,844 INFO L430 AbstractCegarLoop]: === Iteration 215 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:14,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:14,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1334997500, now seen corresponding path program 97 times [2021-07-13 19:59:14,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:14,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341663649] [2021-07-13 19:59:14,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:14,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:15,073 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:15,073 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:15,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341663649] [2021-07-13 19:59:15,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341663649] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:15,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112391104] [2021-07-13 19:59:15,073 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 204 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 204 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:15,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:15,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:15,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:15,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:15,231 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:15,234 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:15,234 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:15,234 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:15,282 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:15,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112391104] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:15,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:15,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:15,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009904846] [2021-07-13 19:59:15,283 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:15,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:15,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:15,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:15,283 INFO L87 Difference]: Start difference. First operand 1974 states and 7122 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:16,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:16,058 INFO L93 Difference]: Finished difference Result 2438 states and 8561 transitions. [2021-07-13 19:59:16,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:59:16,058 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:16,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:16,062 INFO L225 Difference]: With dead ends: 2438 [2021-07-13 19:59:16,062 INFO L226 Difference]: Without dead ends: 2429 [2021-07-13 19:59:16,062 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 753.9ms TimeCoverageRelationStatistics Valid=225, Invalid=1107, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:59:16,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2429 states. [2021-07-13 19:59:16,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2429 to 1963. [2021-07-13 19:59:16,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1963 states, 1962 states have (on average 3.610091743119266) internal successors, (7083), 1962 states have internal predecessors, (7083), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:16,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1963 states to 1963 states and 7083 transitions. [2021-07-13 19:59:16,091 INFO L78 Accepts]: Start accepts. Automaton has 1963 states and 7083 transitions. Word has length 24 [2021-07-13 19:59:16,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:16,091 INFO L482 AbstractCegarLoop]: Abstraction has 1963 states and 7083 transitions. [2021-07-13 19:59:16,091 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:16,091 INFO L276 IsEmpty]: Start isEmpty. Operand 1963 states and 7083 transitions. [2021-07-13 19:59:16,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:16,094 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:16,094 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:16,294 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable371,204 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:16,294 INFO L430 AbstractCegarLoop]: === Iteration 216 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:16,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:16,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1948206298, now seen corresponding path program 98 times [2021-07-13 19:59:16,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:16,295 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731591475] [2021-07-13 19:59:16,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:16,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:16,479 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:16,479 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:16,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731591475] [2021-07-13 19:59:16,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731591475] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:16,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557470049] [2021-07-13 19:59:16,479 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 205 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 205 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:16,507 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:59:16,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:16,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:16,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:16,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:59:16,763 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:59:16,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:16,765 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:16,769 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:16,769 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:16,769 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:59:16,801 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:16,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557470049] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:16,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:16,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:59:16,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405225670] [2021-07-13 19:59:16,802 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:59:16,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:16,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:59:16,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:59:16,802 INFO L87 Difference]: Start difference. First operand 1963 states and 7083 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:17,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:17,758 INFO L93 Difference]: Finished difference Result 2495 states and 8710 transitions. [2021-07-13 19:59:17,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:59:17,758 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:17,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:17,763 INFO L225 Difference]: With dead ends: 2495 [2021-07-13 19:59:17,763 INFO L226 Difference]: Without dead ends: 2486 [2021-07-13 19:59:17,763 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 788.5ms TimeCoverageRelationStatistics Valid=234, Invalid=1326, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 19:59:17,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2486 states. [2021-07-13 19:59:17,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2486 to 1963. [2021-07-13 19:59:17,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1963 states, 1962 states have (on average 3.610091743119266) internal successors, (7083), 1962 states have internal predecessors, (7083), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:17,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1963 states to 1963 states and 7083 transitions. [2021-07-13 19:59:17,791 INFO L78 Accepts]: Start accepts. Automaton has 1963 states and 7083 transitions. Word has length 24 [2021-07-13 19:59:17,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:17,791 INFO L482 AbstractCegarLoop]: Abstraction has 1963 states and 7083 transitions. [2021-07-13 19:59:17,791 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:17,791 INFO L276 IsEmpty]: Start isEmpty. Operand 1963 states and 7083 transitions. [2021-07-13 19:59:17,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:17,794 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:17,794 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:17,994 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable372,205 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:17,995 INFO L430 AbstractCegarLoop]: === Iteration 217 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:17,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:17,995 INFO L82 PathProgramCache]: Analyzing trace with hash 440124240, now seen corresponding path program 99 times [2021-07-13 19:59:17,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:17,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165285039] [2021-07-13 19:59:17,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:17,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:18,219 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:18,219 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:18,219 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165285039] [2021-07-13 19:59:18,219 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165285039] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:18,219 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112789559] [2021-07-13 19:59:18,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 206 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 206 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:18,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:59:18,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:18,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:18,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:18,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:59:18,468 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 19:59:18,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:18,469 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:18,473 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:18,474 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:18,474 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 19:59:18,505 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:18,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112789559] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:18,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:18,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:59:18,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634454241] [2021-07-13 19:59:18,505 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:59:18,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:18,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:59:18,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:59:18,506 INFO L87 Difference]: Start difference. First operand 1963 states and 7083 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:19,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:19,416 INFO L93 Difference]: Finished difference Result 2517 states and 8781 transitions. [2021-07-13 19:59:19,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 19:59:19,416 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:19,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:19,421 INFO L225 Difference]: With dead ends: 2517 [2021-07-13 19:59:19,421 INFO L226 Difference]: Without dead ends: 2507 [2021-07-13 19:59:19,421 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 814.2ms TimeCoverageRelationStatistics Valid=223, Invalid=1259, Unknown=0, NotChecked=0, Total=1482 [2021-07-13 19:59:19,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2507 states. [2021-07-13 19:59:19,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2507 to 1967. [2021-07-13 19:59:19,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1967 states, 1966 states have (on average 3.608850457782299) internal successors, (7095), 1966 states have internal predecessors, (7095), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:19,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1967 states to 1967 states and 7095 transitions. [2021-07-13 19:59:19,449 INFO L78 Accepts]: Start accepts. Automaton has 1967 states and 7095 transitions. Word has length 24 [2021-07-13 19:59:19,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:19,449 INFO L482 AbstractCegarLoop]: Abstraction has 1967 states and 7095 transitions. [2021-07-13 19:59:19,449 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:19,449 INFO L276 IsEmpty]: Start isEmpty. Operand 1967 states and 7095 transitions. [2021-07-13 19:59:19,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:19,452 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:19,452 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:19,652 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable373,206 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:19,653 INFO L430 AbstractCegarLoop]: === Iteration 218 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:19,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:19,653 INFO L82 PathProgramCache]: Analyzing trace with hash -1918599544, now seen corresponding path program 100 times [2021-07-13 19:59:19,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:19,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234535712] [2021-07-13 19:59:19,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:19,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:19,864 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:19,864 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:19,864 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234535712] [2021-07-13 19:59:19,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234535712] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:19,864 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085375180] [2021-07-13 19:59:19,864 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 207 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 207 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:19,892 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:59:19,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:19,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:19,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:20,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:20,059 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:20,060 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:20,061 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:20,061 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:59:20,098 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:20,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085375180] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:20,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:20,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:59:20,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025881144] [2021-07-13 19:59:20,099 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:20,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:20,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:20,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:20,100 INFO L87 Difference]: Start difference. First operand 1967 states and 7095 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:21,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:21,124 INFO L93 Difference]: Finished difference Result 2507 states and 8780 transitions. [2021-07-13 19:59:21,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:59:21,124 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:21,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:21,128 INFO L225 Difference]: With dead ends: 2507 [2021-07-13 19:59:21,129 INFO L226 Difference]: Without dead ends: 2497 [2021-07-13 19:59:21,129 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 855.6ms TimeCoverageRelationStatistics Valid=249, Invalid=1311, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 19:59:21,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2497 states. [2021-07-13 19:59:21,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2497 to 1966. [2021-07-13 19:59:21,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1966 states, 1965 states have (on average 3.6106870229007635) internal successors, (7095), 1965 states have internal predecessors, (7095), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:21,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1966 states to 1966 states and 7095 transitions. [2021-07-13 19:59:21,156 INFO L78 Accepts]: Start accepts. Automaton has 1966 states and 7095 transitions. Word has length 24 [2021-07-13 19:59:21,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:21,156 INFO L482 AbstractCegarLoop]: Abstraction has 1966 states and 7095 transitions. [2021-07-13 19:59:21,157 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:21,157 INFO L276 IsEmpty]: Start isEmpty. Operand 1966 states and 7095 transitions. [2021-07-13 19:59:21,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:21,159 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:21,159 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:21,359 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 207 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable374 [2021-07-13 19:59:21,360 INFO L430 AbstractCegarLoop]: === Iteration 219 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:21,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:21,360 INFO L82 PathProgramCache]: Analyzing trace with hash -2095140976, now seen corresponding path program 101 times [2021-07-13 19:59:21,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:21,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145378980] [2021-07-13 19:59:21,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:21,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:21,535 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:21,536 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:21,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145378980] [2021-07-13 19:59:21,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145378980] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:21,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789256461] [2021-07-13 19:59:21,536 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 208 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 208 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:21,564 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:59:21,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:21,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:21,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:21,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:21,690 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:21,692 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:21,693 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:21,693 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:21,741 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:21,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789256461] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:21,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:21,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:21,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569165184] [2021-07-13 19:59:21,742 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:21,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:21,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:21,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:21,742 INFO L87 Difference]: Start difference. First operand 1966 states and 7095 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:22,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:22,760 INFO L93 Difference]: Finished difference Result 2493 states and 8734 transitions. [2021-07-13 19:59:22,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 19:59:22,760 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:22,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:22,765 INFO L225 Difference]: With dead ends: 2493 [2021-07-13 19:59:22,765 INFO L226 Difference]: Without dead ends: 2484 [2021-07-13 19:59:22,765 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 849.8ms TimeCoverageRelationStatistics Valid=286, Invalid=1520, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:59:22,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2484 states. [2021-07-13 19:59:22,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2484 to 1969. [2021-07-13 19:59:22,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1969 states, 1968 states have (on average 3.609247967479675) internal successors, (7103), 1968 states have internal predecessors, (7103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:22,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1969 states to 1969 states and 7103 transitions. [2021-07-13 19:59:22,794 INFO L78 Accepts]: Start accepts. Automaton has 1969 states and 7103 transitions. Word has length 24 [2021-07-13 19:59:22,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:22,794 INFO L482 AbstractCegarLoop]: Abstraction has 1969 states and 7103 transitions. [2021-07-13 19:59:22,794 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:22,794 INFO L276 IsEmpty]: Start isEmpty. Operand 1969 states and 7103 transitions. [2021-07-13 19:59:22,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:22,797 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:22,797 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:22,997 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 208 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable375 [2021-07-13 19:59:22,997 INFO L430 AbstractCegarLoop]: === Iteration 220 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:22,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:22,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1366087880, now seen corresponding path program 102 times [2021-07-13 19:59:22,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:22,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309258371] [2021-07-13 19:59:22,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:23,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:23,189 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:23,189 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:23,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309258371] [2021-07-13 19:59:23,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309258371] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:23,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379588946] [2021-07-13 19:59:23,190 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 209 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 209 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:23,230 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:59:23,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:23,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:23,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:23,373 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:23,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:59:23,374 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:23,384 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:23,385 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:23,385 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:59:23,482 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:23,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [379588946] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:23,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:23,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:59:23,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807815702] [2021-07-13 19:59:23,483 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:23,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:23,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:23,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:23,483 INFO L87 Difference]: Start difference. First operand 1969 states and 7103 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:24,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:24,857 INFO L93 Difference]: Finished difference Result 2601 states and 8996 transitions. [2021-07-13 19:59:24,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-07-13 19:59:24,857 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:24,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:24,862 INFO L225 Difference]: With dead ends: 2601 [2021-07-13 19:59:24,862 INFO L226 Difference]: Without dead ends: 2582 [2021-07-13 19:59:24,863 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 1244.6ms TimeCoverageRelationStatistics Valid=378, Invalid=1974, Unknown=0, NotChecked=0, Total=2352 [2021-07-13 19:59:24,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2582 states. [2021-07-13 19:59:24,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2582 to 1974. [2021-07-13 19:59:24,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1974 states, 1973 states have (on average 3.6117587430309173) internal successors, (7126), 1973 states have internal predecessors, (7126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:24,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1974 states to 1974 states and 7126 transitions. [2021-07-13 19:59:24,895 INFO L78 Accepts]: Start accepts. Automaton has 1974 states and 7126 transitions. Word has length 24 [2021-07-13 19:59:24,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:24,895 INFO L482 AbstractCegarLoop]: Abstraction has 1974 states and 7126 transitions. [2021-07-13 19:59:24,895 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:24,895 INFO L276 IsEmpty]: Start isEmpty. Operand 1974 states and 7126 transitions. [2021-07-13 19:59:24,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:24,898 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:24,898 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:25,099 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 209 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable376 [2021-07-13 19:59:25,099 INFO L430 AbstractCegarLoop]: === Iteration 221 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:25,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:25,099 INFO L82 PathProgramCache]: Analyzing trace with hash -2147045616, now seen corresponding path program 103 times [2021-07-13 19:59:25,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:25,099 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104807732] [2021-07-13 19:59:25,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:25,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:25,269 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:25,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:25,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104807732] [2021-07-13 19:59:25,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104807732] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:25,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850782615] [2021-07-13 19:59:25,270 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 210 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 210 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:25,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:25,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:25,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:25,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:25,434 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:25,436 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:25,437 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:25,437 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:25,483 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:25,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850782615] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:25,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:25,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:59:25,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355466053] [2021-07-13 19:59:25,483 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:59:25,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:25,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:59:25,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:59:25,484 INFO L87 Difference]: Start difference. First operand 1974 states and 7126 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:26,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:26,478 INFO L93 Difference]: Finished difference Result 2447 states and 8580 transitions. [2021-07-13 19:59:26,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 19:59:26,478 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:26,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:26,483 INFO L225 Difference]: With dead ends: 2447 [2021-07-13 19:59:26,483 INFO L226 Difference]: Without dead ends: 2437 [2021-07-13 19:59:26,483 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 806.7ms TimeCoverageRelationStatistics Valid=225, Invalid=1335, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 19:59:26,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2437 states. [2021-07-13 19:59:26,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2437 to 1970. [2021-07-13 19:59:26,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1970 states, 1969 states have (on average 3.612493651599797) internal successors, (7113), 1969 states have internal predecessors, (7113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:26,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1970 states to 1970 states and 7113 transitions. [2021-07-13 19:59:26,513 INFO L78 Accepts]: Start accepts. Automaton has 1970 states and 7113 transitions. Word has length 24 [2021-07-13 19:59:26,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:26,513 INFO L482 AbstractCegarLoop]: Abstraction has 1970 states and 7113 transitions. [2021-07-13 19:59:26,513 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:26,513 INFO L276 IsEmpty]: Start isEmpty. Operand 1970 states and 7113 transitions. [2021-07-13 19:59:26,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:26,516 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:26,516 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:26,716 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 210 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable379 [2021-07-13 19:59:26,716 INFO L430 AbstractCegarLoop]: === Iteration 222 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:26,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:26,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1479020142, now seen corresponding path program 104 times [2021-07-13 19:59:26,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:26,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402334369] [2021-07-13 19:59:26,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:26,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:26,929 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:26,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:26,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402334369] [2021-07-13 19:59:26,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402334369] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:26,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9230988] [2021-07-13 19:59:26,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 211 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 211 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:26,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:59:26,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:26,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:26,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:27,136 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:27,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 19:59:27,138 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:27,147 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:27,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:27,147 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 19:59:27,213 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:27,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9230988] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:27,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:27,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 19:59:27,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988799743] [2021-07-13 19:59:27,213 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:59:27,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:27,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:59:27,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:59:27,214 INFO L87 Difference]: Start difference. First operand 1970 states and 7113 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:28,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:28,891 INFO L93 Difference]: Finished difference Result 2518 states and 8787 transitions. [2021-07-13 19:59:28,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:59:28,891 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:28,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:28,896 INFO L225 Difference]: With dead ends: 2518 [2021-07-13 19:59:28,896 INFO L226 Difference]: Without dead ends: 2499 [2021-07-13 19:59:28,896 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 1500.0ms TimeCoverageRelationStatistics Valid=434, Invalid=2116, Unknown=0, NotChecked=0, Total=2550 [2021-07-13 19:59:28,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2499 states. [2021-07-13 19:59:28,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2499 to 1974. [2021-07-13 19:59:28,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1974 states, 1973 states have (on average 3.6122655854029397) internal successors, (7127), 1973 states have internal predecessors, (7127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:28,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1974 states to 1974 states and 7127 transitions. [2021-07-13 19:59:28,925 INFO L78 Accepts]: Start accepts. Automaton has 1974 states and 7127 transitions. Word has length 24 [2021-07-13 19:59:28,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:28,925 INFO L482 AbstractCegarLoop]: Abstraction has 1974 states and 7127 transitions. [2021-07-13 19:59:28,925 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:28,925 INFO L276 IsEmpty]: Start isEmpty. Operand 1974 states and 7127 transitions. [2021-07-13 19:59:28,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:28,928 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:28,928 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:29,128 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable380,211 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:29,128 INFO L430 AbstractCegarLoop]: === Iteration 223 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:29,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:29,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1787797294, now seen corresponding path program 105 times [2021-07-13 19:59:29,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:29,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534778387] [2021-07-13 19:59:29,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:29,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:29,300 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:29,300 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:29,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534778387] [2021-07-13 19:59:29,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534778387] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:29,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629798372] [2021-07-13 19:59:29,300 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 212 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 212 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:29,327 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:59:29,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:29,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:29,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:29,465 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:29,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:59:29,466 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:29,476 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:29,476 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:29,476 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:59:29,584 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:29,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629798372] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:29,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:29,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:59:29,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161693734] [2021-07-13 19:59:29,585 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:29,585 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:29,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:29,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:29,585 INFO L87 Difference]: Start difference. First operand 1974 states and 7127 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:30,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:30,832 INFO L93 Difference]: Finished difference Result 2444 states and 8570 transitions. [2021-07-13 19:59:30,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 19:59:30,832 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:30,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:30,836 INFO L225 Difference]: With dead ends: 2444 [2021-07-13 19:59:30,836 INFO L226 Difference]: Without dead ends: 2425 [2021-07-13 19:59:30,837 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 1142.6ms TimeCoverageRelationStatistics Valid=384, Invalid=1686, Unknown=0, NotChecked=0, Total=2070 [2021-07-13 19:59:30,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2425 states. [2021-07-13 19:59:30,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2425 to 1979. [2021-07-13 19:59:30,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1979 states, 1978 states have (on average 3.6122345803842264) internal successors, (7145), 1978 states have internal predecessors, (7145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:30,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1979 states to 1979 states and 7145 transitions. [2021-07-13 19:59:30,868 INFO L78 Accepts]: Start accepts. Automaton has 1979 states and 7145 transitions. Word has length 24 [2021-07-13 19:59:30,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:30,868 INFO L482 AbstractCegarLoop]: Abstraction has 1979 states and 7145 transitions. [2021-07-13 19:59:30,868 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:30,868 INFO L276 IsEmpty]: Start isEmpty. Operand 1979 states and 7145 transitions. [2021-07-13 19:59:30,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:30,871 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:30,871 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:31,071 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable383,212 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:31,072 INFO L430 AbstractCegarLoop]: === Iteration 224 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:31,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:31,072 INFO L82 PathProgramCache]: Analyzing trace with hash 2111383472, now seen corresponding path program 106 times [2021-07-13 19:59:31,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:31,072 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149864030] [2021-07-13 19:59:31,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:31,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:31,247 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:31,247 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:31,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149864030] [2021-07-13 19:59:31,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149864030] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:31,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70783174] [2021-07-13 19:59:31,247 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 213 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 213 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:31,275 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:59:31,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:31,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:31,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:31,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:31,404 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:31,407 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:31,408 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:31,408 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:31,457 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:31,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70783174] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:31,457 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:31,457 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:31,457 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266207511] [2021-07-13 19:59:31,457 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:31,457 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:31,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:31,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:31,458 INFO L87 Difference]: Start difference. First operand 1979 states and 7145 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:32,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:32,288 INFO L93 Difference]: Finished difference Result 2401 states and 8472 transitions. [2021-07-13 19:59:32,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:59:32,289 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:32,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:32,294 INFO L225 Difference]: With dead ends: 2401 [2021-07-13 19:59:32,294 INFO L226 Difference]: Without dead ends: 2388 [2021-07-13 19:59:32,294 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 749.7ms TimeCoverageRelationStatistics Valid=231, Invalid=1101, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:59:32,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2388 states. [2021-07-13 19:59:32,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2388 to 1974. [2021-07-13 19:59:32,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1974 states, 1973 states have (on average 3.6122655854029397) internal successors, (7127), 1973 states have internal predecessors, (7127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:32,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1974 states to 1974 states and 7127 transitions. [2021-07-13 19:59:32,326 INFO L78 Accepts]: Start accepts. Automaton has 1974 states and 7127 transitions. Word has length 24 [2021-07-13 19:59:32,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:32,327 INFO L482 AbstractCegarLoop]: Abstraction has 1974 states and 7127 transitions. [2021-07-13 19:59:32,327 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:32,327 INFO L276 IsEmpty]: Start isEmpty. Operand 1974 states and 7127 transitions. [2021-07-13 19:59:32,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:32,330 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:32,330 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:32,530 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable386,213 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:32,530 INFO L430 AbstractCegarLoop]: === Iteration 225 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:32,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:32,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1365890042, now seen corresponding path program 107 times [2021-07-13 19:59:32,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:32,531 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908741081] [2021-07-13 19:59:32,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:32,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:32,742 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:32,742 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:32,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908741081] [2021-07-13 19:59:32,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908741081] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:32,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419635040] [2021-07-13 19:59:32,742 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 214 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 214 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:32,770 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:59:32,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:32,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:32,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:32,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:32,927 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:32,929 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:32,929 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:32,929 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:59:32,960 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:32,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419635040] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:32,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:32,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:59:32,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671785027] [2021-07-13 19:59:32,960 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:32,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:32,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:32,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:32,961 INFO L87 Difference]: Start difference. First operand 1974 states and 7127 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:34,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:34,136 INFO L93 Difference]: Finished difference Result 2538 states and 8840 transitions. [2021-07-13 19:59:34,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:59:34,136 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:34,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:34,140 INFO L225 Difference]: With dead ends: 2538 [2021-07-13 19:59:34,140 INFO L226 Difference]: Without dead ends: 2519 [2021-07-13 19:59:34,141 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 971.6ms TimeCoverageRelationStatistics Valid=277, Invalid=1529, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:59:34,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2519 states. [2021-07-13 19:59:34,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2519 to 1974. [2021-07-13 19:59:34,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1974 states, 1973 states have (on average 3.6122655854029397) internal successors, (7127), 1973 states have internal predecessors, (7127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:34,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1974 states to 1974 states and 7127 transitions. [2021-07-13 19:59:34,168 INFO L78 Accepts]: Start accepts. Automaton has 1974 states and 7127 transitions. Word has length 24 [2021-07-13 19:59:34,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:34,169 INFO L482 AbstractCegarLoop]: Abstraction has 1974 states and 7127 transitions. [2021-07-13 19:59:34,169 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:34,169 INFO L276 IsEmpty]: Start isEmpty. Operand 1974 states and 7127 transitions. [2021-07-13 19:59:34,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:34,171 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:34,171 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:34,372 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 214 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable387 [2021-07-13 19:59:34,372 INFO L430 AbstractCegarLoop]: === Iteration 226 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:34,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:34,372 INFO L82 PathProgramCache]: Analyzing trace with hash 109929152, now seen corresponding path program 108 times [2021-07-13 19:59:34,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:34,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213081193] [2021-07-13 19:59:34,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:34,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:34,596 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:34,596 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:34,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213081193] [2021-07-13 19:59:34,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213081193] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:34,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353191513] [2021-07-13 19:59:34,596 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 215 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 215 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:34,624 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:59:34,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:34,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 37 conjunts are in the unsatisfiable core [2021-07-13 19:59:34,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:34,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:34,823 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:34,829 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:34,829 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:34,829 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:29, output treesize:15 [2021-07-13 19:59:34,882 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:34,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353191513] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:34,883 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:34,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:59:34,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916644114] [2021-07-13 19:59:34,883 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:59:34,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:34,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:59:34,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:59:34,883 INFO L87 Difference]: Start difference. First operand 1974 states and 7127 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:35,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:35,446 INFO L93 Difference]: Finished difference Result 2514 states and 8723 transitions. [2021-07-13 19:59:35,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-13 19:59:35,447 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:35,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:35,451 INFO L225 Difference]: With dead ends: 2514 [2021-07-13 19:59:35,451 INFO L226 Difference]: Without dead ends: 2456 [2021-07-13 19:59:35,451 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 583.9ms TimeCoverageRelationStatistics Valid=201, Invalid=921, Unknown=0, NotChecked=0, Total=1122 [2021-07-13 19:59:35,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2456 states. [2021-07-13 19:59:35,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2456 to 1983. [2021-07-13 19:59:35,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1983 states, 1982 states have (on average 3.608980827447023) internal successors, (7153), 1982 states have internal predecessors, (7153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:35,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1983 states to 1983 states and 7153 transitions. [2021-07-13 19:59:35,478 INFO L78 Accepts]: Start accepts. Automaton has 1983 states and 7153 transitions. Word has length 24 [2021-07-13 19:59:35,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:35,479 INFO L482 AbstractCegarLoop]: Abstraction has 1983 states and 7153 transitions. [2021-07-13 19:59:35,479 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:35,479 INFO L276 IsEmpty]: Start isEmpty. Operand 1983 states and 7153 transitions. [2021-07-13 19:59:35,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:35,481 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:35,481 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:35,682 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 215 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable388 [2021-07-13 19:59:35,682 INFO L430 AbstractCegarLoop]: === Iteration 227 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:35,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:35,682 INFO L82 PathProgramCache]: Analyzing trace with hash 79584234, now seen corresponding path program 109 times [2021-07-13 19:59:35,682 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:35,682 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572913861] [2021-07-13 19:59:35,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:35,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:35,915 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:35,915 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:35,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572913861] [2021-07-13 19:59:35,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572913861] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:35,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323932561] [2021-07-13 19:59:35,916 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 216 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 216 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:35,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:35,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:35,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:36,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:36,096 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:36,097 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:36,097 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:36,097 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:59:36,128 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:36,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323932561] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:36,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:36,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:59:36,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026924970] [2021-07-13 19:59:36,128 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:36,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:36,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:36,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:36,129 INFO L87 Difference]: Start difference. First operand 1983 states and 7153 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:37,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:37,112 INFO L93 Difference]: Finished difference Result 2509 states and 8769 transitions. [2021-07-13 19:59:37,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 19:59:37,112 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:37,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:37,117 INFO L225 Difference]: With dead ends: 2509 [2021-07-13 19:59:37,117 INFO L226 Difference]: Without dead ends: 2499 [2021-07-13 19:59:37,117 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 879.0ms TimeCoverageRelationStatistics Valid=252, Invalid=1388, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 19:59:37,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2499 states. [2021-07-13 19:59:37,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2499 to 1984. [2021-07-13 19:59:37,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1984 states, 1983 states have (on average 3.6091780131114475) internal successors, (7157), 1983 states have internal predecessors, (7157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:37,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1984 states to 1984 states and 7157 transitions. [2021-07-13 19:59:37,146 INFO L78 Accepts]: Start accepts. Automaton has 1984 states and 7157 transitions. Word has length 24 [2021-07-13 19:59:37,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:37,146 INFO L482 AbstractCegarLoop]: Abstraction has 1984 states and 7157 transitions. [2021-07-13 19:59:37,147 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:37,147 INFO L276 IsEmpty]: Start isEmpty. Operand 1984 states and 7157 transitions. [2021-07-13 19:59:37,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:37,149 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:37,149 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:37,350 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 216 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable389 [2021-07-13 19:59:37,350 INFO L430 AbstractCegarLoop]: === Iteration 228 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:37,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:37,350 INFO L82 PathProgramCache]: Analyzing trace with hash -96957198, now seen corresponding path program 110 times [2021-07-13 19:59:37,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:37,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316221373] [2021-07-13 19:59:37,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:37,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:37,527 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:37,527 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:37,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316221373] [2021-07-13 19:59:37,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316221373] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:37,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403864615] [2021-07-13 19:59:37,527 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 217 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 217 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:37,555 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:59:37,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:37,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:37,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:37,702 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:37,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:59:37,703 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:37,713 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:37,714 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:37,714 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:59:37,821 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:37,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403864615] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:37,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:37,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:59:37,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246571813] [2021-07-13 19:59:37,822 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:37,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:37,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:37,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:37,823 INFO L87 Difference]: Start difference. First operand 1984 states and 7157 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:39,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:39,590 INFO L93 Difference]: Finished difference Result 2588 states and 8993 transitions. [2021-07-13 19:59:39,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-07-13 19:59:39,590 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:39,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:39,595 INFO L225 Difference]: With dead ends: 2588 [2021-07-13 19:59:39,595 INFO L226 Difference]: Without dead ends: 2569 [2021-07-13 19:59:39,596 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1543.7ms TimeCoverageRelationStatistics Valid=508, Invalid=2462, Unknown=0, NotChecked=0, Total=2970 [2021-07-13 19:59:39,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2569 states. [2021-07-13 19:59:39,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2569 to 1988. [2021-07-13 19:59:39,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1988 states, 1987 states have (on average 3.610468042274786) internal successors, (7174), 1987 states have internal predecessors, (7174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:39,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1988 states to 1988 states and 7174 transitions. [2021-07-13 19:59:39,637 INFO L78 Accepts]: Start accepts. Automaton has 1988 states and 7174 transitions. Word has length 24 [2021-07-13 19:59:39,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:39,638 INFO L482 AbstractCegarLoop]: Abstraction has 1988 states and 7174 transitions. [2021-07-13 19:59:39,638 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:39,638 INFO L276 IsEmpty]: Start isEmpty. Operand 1988 states and 7174 transitions. [2021-07-13 19:59:39,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:39,640 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:39,640 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:39,841 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 217 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable390 [2021-07-13 19:59:39,841 INFO L430 AbstractCegarLoop]: === Iteration 229 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:39,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:39,841 INFO L82 PathProgramCache]: Analyzing trace with hash -930695638, now seen corresponding path program 111 times [2021-07-13 19:59:39,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:39,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373304757] [2021-07-13 19:59:39,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:39,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:40,015 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:40,016 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:40,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373304757] [2021-07-13 19:59:40,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1373304757] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:40,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862313286] [2021-07-13 19:59:40,016 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 218 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 218 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:40,045 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:59:40,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:40,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:40,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:40,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:40,171 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:40,174 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:40,174 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:40,174 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:40,224 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:40,224 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862313286] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:40,224 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:40,224 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:40,224 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433693057] [2021-07-13 19:59:40,224 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:40,224 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:40,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:40,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:40,225 INFO L87 Difference]: Start difference. First operand 1988 states and 7174 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:41,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:41,209 INFO L93 Difference]: Finished difference Result 2469 states and 8651 transitions. [2021-07-13 19:59:41,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 19:59:41,210 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:41,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:41,214 INFO L225 Difference]: With dead ends: 2469 [2021-07-13 19:59:41,214 INFO L226 Difference]: Without dead ends: 2459 [2021-07-13 19:59:41,214 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 826.9ms TimeCoverageRelationStatistics Valid=260, Invalid=1462, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 19:59:41,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2459 states. [2021-07-13 19:59:41,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2459 to 1987. [2021-07-13 19:59:41,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1987 states, 1986 states have (on average 3.610271903323263) internal successors, (7170), 1986 states have internal predecessors, (7170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:41,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1987 states to 1987 states and 7170 transitions. [2021-07-13 19:59:41,243 INFO L78 Accepts]: Start accepts. Automaton has 1987 states and 7170 transitions. Word has length 24 [2021-07-13 19:59:41,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:41,243 INFO L482 AbstractCegarLoop]: Abstraction has 1987 states and 7170 transitions. [2021-07-13 19:59:41,243 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:41,243 INFO L276 IsEmpty]: Start isEmpty. Operand 1987 states and 7170 transitions. [2021-07-13 19:59:41,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:41,245 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:41,245 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:41,446 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable393,218 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:41,446 INFO L430 AbstractCegarLoop]: === Iteration 230 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:41,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:41,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1762867562, now seen corresponding path program 112 times [2021-07-13 19:59:41,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:41,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629488543] [2021-07-13 19:59:41,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:41,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:41,660 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:41,660 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:41,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629488543] [2021-07-13 19:59:41,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629488543] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:41,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875686656] [2021-07-13 19:59:41,660 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 219 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 219 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:41,687 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:59:41,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:41,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:41,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:41,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:41,840 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:41,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:41,842 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:41,842 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 19:59:41,871 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:41,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875686656] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:41,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:41,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 19:59:41,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711363837] [2021-07-13 19:59:41,872 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:41,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:41,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:41,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:41,872 INFO L87 Difference]: Start difference. First operand 1987 states and 7170 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:42,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:42,891 INFO L93 Difference]: Finished difference Result 2492 states and 8720 transitions. [2021-07-13 19:59:42,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:59:42,891 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:42,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:42,896 INFO L225 Difference]: With dead ends: 2492 [2021-07-13 19:59:42,896 INFO L226 Difference]: Without dead ends: 2473 [2021-07-13 19:59:42,897 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 851.2ms TimeCoverageRelationStatistics Valid=247, Invalid=1313, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 19:59:42,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2473 states. [2021-07-13 19:59:42,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2473 to 1991. [2021-07-13 19:59:42,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1991 states, 1990 states have (on average 3.6105527638190953) internal successors, (7185), 1990 states have internal predecessors, (7185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:42,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1991 states to 1991 states and 7185 transitions. [2021-07-13 19:59:42,927 INFO L78 Accepts]: Start accepts. Automaton has 1991 states and 7185 transitions. Word has length 24 [2021-07-13 19:59:42,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:42,927 INFO L482 AbstractCegarLoop]: Abstraction has 1991 states and 7185 transitions. [2021-07-13 19:59:42,927 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:42,927 INFO L276 IsEmpty]: Start isEmpty. Operand 1991 states and 7185 transitions. [2021-07-13 19:59:42,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:42,929 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:42,930 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:43,130 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 219 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable394 [2021-07-13 19:59:43,130 INFO L430 AbstractCegarLoop]: === Iteration 231 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:43,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:43,130 INFO L82 PathProgramCache]: Analyzing trace with hash 734717702, now seen corresponding path program 113 times [2021-07-13 19:59:43,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:43,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60483161] [2021-07-13 19:59:43,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:43,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:43,303 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:43,303 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:43,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60483161] [2021-07-13 19:59:43,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60483161] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:43,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084900135] [2021-07-13 19:59:43,303 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 220 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 220 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:43,330 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:59:43,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:43,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:43,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:43,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:43,457 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:43,460 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:43,460 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:43,461 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:43,521 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:43,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084900135] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:43,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:43,521 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:43,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085767898] [2021-07-13 19:59:43,522 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:43,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:43,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:43,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:43,522 INFO L87 Difference]: Start difference. First operand 1991 states and 7185 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:44,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:44,264 INFO L93 Difference]: Finished difference Result 2469 states and 8673 transitions. [2021-07-13 19:59:44,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 19:59:44,265 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:44,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:44,269 INFO L225 Difference]: With dead ends: 2469 [2021-07-13 19:59:44,269 INFO L226 Difference]: Without dead ends: 2459 [2021-07-13 19:59:44,269 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 712.3ms TimeCoverageRelationStatistics Valid=235, Invalid=1097, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 19:59:44,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2459 states. [2021-07-13 19:59:44,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2459 to 1994. [2021-07-13 19:59:44,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1994 states, 1993 states have (on average 3.611138986452584) internal successors, (7197), 1993 states have internal predecessors, (7197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:44,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1994 states to 1994 states and 7197 transitions. [2021-07-13 19:59:44,297 INFO L78 Accepts]: Start accepts. Automaton has 1994 states and 7197 transitions. Word has length 24 [2021-07-13 19:59:44,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:44,297 INFO L482 AbstractCegarLoop]: Abstraction has 1994 states and 7197 transitions. [2021-07-13 19:59:44,297 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:44,297 INFO L276 IsEmpty]: Start isEmpty. Operand 1994 states and 7197 transitions. [2021-07-13 19:59:44,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:44,300 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:44,300 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:44,500 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable395,220 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:44,501 INFO L430 AbstractCegarLoop]: === Iteration 232 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:44,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:44,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1058303880, now seen corresponding path program 114 times [2021-07-13 19:59:44,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:44,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843514715] [2021-07-13 19:59:44,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:44,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:44,681 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:44,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:44,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843514715] [2021-07-13 19:59:44,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843514715] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:44,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107379318] [2021-07-13 19:59:44,681 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 221 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 221 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:44,708 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:59:44,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:44,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:44,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:44,857 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:44,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:59:44,858 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:44,868 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:44,869 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:44,869 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 19:59:44,963 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:44,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107379318] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:44,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:44,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:59:44,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566799096] [2021-07-13 19:59:44,963 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:44,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:44,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:44,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:44,964 INFO L87 Difference]: Start difference. First operand 1994 states and 7197 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:45,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:45,875 INFO L93 Difference]: Finished difference Result 2464 states and 8603 transitions. [2021-07-13 19:59:45,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 19:59:45,875 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:45,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:45,879 INFO L225 Difference]: With dead ends: 2464 [2021-07-13 19:59:45,880 INFO L226 Difference]: Without dead ends: 2445 [2021-07-13 19:59:45,880 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 929.7ms TimeCoverageRelationStatistics Valid=287, Invalid=1273, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 19:59:45,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2445 states. [2021-07-13 19:59:45,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2445 to 1998. [2021-07-13 19:59:45,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1998 states, 1997 states have (on average 3.6119178768152227) internal successors, (7213), 1997 states have internal predecessors, (7213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:45,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1998 states to 1998 states and 7213 transitions. [2021-07-13 19:59:45,919 INFO L78 Accepts]: Start accepts. Automaton has 1998 states and 7213 transitions. Word has length 24 [2021-07-13 19:59:45,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:45,919 INFO L482 AbstractCegarLoop]: Abstraction has 1998 states and 7213 transitions. [2021-07-13 19:59:45,919 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:45,919 INFO L276 IsEmpty]: Start isEmpty. Operand 1998 states and 7213 transitions. [2021-07-13 19:59:45,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:45,922 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:45,922 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:46,123 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable396,221 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:46,123 INFO L430 AbstractCegarLoop]: === Iteration 233 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:46,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:46,123 INFO L82 PathProgramCache]: Analyzing trace with hash -1550919294, now seen corresponding path program 115 times [2021-07-13 19:59:46,123 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:46,123 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124028790] [2021-07-13 19:59:46,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:46,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:46,294 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:46,294 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:46,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124028790] [2021-07-13 19:59:46,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124028790] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:46,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718892311] [2021-07-13 19:59:46,295 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 222 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 222 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:46,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:46,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:46,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:46,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:46,453 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:46,456 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:46,457 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:46,457 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:46,501 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:46,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718892311] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:46,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:46,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:59:46,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004098603] [2021-07-13 19:59:46,502 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:59:46,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:46,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:59:46,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:59:46,502 INFO L87 Difference]: Start difference. First operand 1998 states and 7213 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:47,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:47,285 INFO L93 Difference]: Finished difference Result 2386 states and 8411 transitions. [2021-07-13 19:59:47,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-07-13 19:59:47,285 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:47,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:47,290 INFO L225 Difference]: With dead ends: 2386 [2021-07-13 19:59:47,290 INFO L226 Difference]: Without dead ends: 2373 [2021-07-13 19:59:47,290 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 623.3ms TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2021-07-13 19:59:47,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2373 states. [2021-07-13 19:59:47,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2373 to 1991. [2021-07-13 19:59:47,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1991 states, 1990 states have (on average 3.6105527638190953) internal successors, (7185), 1990 states have internal predecessors, (7185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:47,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1991 states to 1991 states and 7185 transitions. [2021-07-13 19:59:47,318 INFO L78 Accepts]: Start accepts. Automaton has 1991 states and 7185 transitions. Word has length 24 [2021-07-13 19:59:47,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:47,318 INFO L482 AbstractCegarLoop]: Abstraction has 1991 states and 7185 transitions. [2021-07-13 19:59:47,318 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:47,318 INFO L276 IsEmpty]: Start isEmpty. Operand 1991 states and 7185 transitions. [2021-07-13 19:59:47,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:47,321 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:47,321 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:47,521 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 222 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable399 [2021-07-13 19:59:47,521 INFO L430 AbstractCegarLoop]: === Iteration 234 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:47,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:47,522 INFO L82 PathProgramCache]: Analyzing trace with hash -1912653030, now seen corresponding path program 116 times [2021-07-13 19:59:47,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:47,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134176800] [2021-07-13 19:59:47,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:47,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:47,737 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:47,737 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:47,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134176800] [2021-07-13 19:59:47,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134176800] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:47,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143447793] [2021-07-13 19:59:47,737 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 223 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 223 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:47,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:59:47,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:47,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 37 conjunts are in the unsatisfiable core [2021-07-13 19:59:47,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:47,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 19:59:47,949 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:47,955 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:47,955 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:47,955 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:29, output treesize:15 [2021-07-13 19:59:48,008 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:48,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143447793] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:48,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:48,009 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 19:59:48,009 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333524001] [2021-07-13 19:59:48,009 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 19:59:48,009 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:48,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 19:59:48,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2021-07-13 19:59:48,009 INFO L87 Difference]: Start difference. First operand 1991 states and 7185 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:48,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:48,619 INFO L93 Difference]: Finished difference Result 2486 states and 8672 transitions. [2021-07-13 19:59:48,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:59:48,619 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:48,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:48,624 INFO L225 Difference]: With dead ends: 2486 [2021-07-13 19:59:48,624 INFO L226 Difference]: Without dead ends: 2434 [2021-07-13 19:59:48,624 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 575.6ms TimeCoverageRelationStatistics Valid=199, Invalid=923, Unknown=0, NotChecked=0, Total=1122 [2021-07-13 19:59:48,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2434 states. [2021-07-13 19:59:48,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2434 to 1995. [2021-07-13 19:59:48,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1995 states, 1994 states have (on average 3.6093279839518555) internal successors, (7197), 1994 states have internal predecessors, (7197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:48,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1995 states to 1995 states and 7197 transitions. [2021-07-13 19:59:48,652 INFO L78 Accepts]: Start accepts. Automaton has 1995 states and 7197 transitions. Word has length 24 [2021-07-13 19:59:48,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:48,652 INFO L482 AbstractCegarLoop]: Abstraction has 1995 states and 7197 transitions. [2021-07-13 19:59:48,652 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:48,652 INFO L276 IsEmpty]: Start isEmpty. Operand 1995 states and 7197 transitions. [2021-07-13 19:59:48,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:48,655 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:48,655 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:48,855 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 223 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable400 [2021-07-13 19:59:48,855 INFO L430 AbstractCegarLoop]: === Iteration 235 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:48,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:48,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1695228144, now seen corresponding path program 117 times [2021-07-13 19:59:48,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:48,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814221051] [2021-07-13 19:59:48,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:48,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:49,026 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:49,026 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:49,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814221051] [2021-07-13 19:59:49,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814221051] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:49,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370251886] [2021-07-13 19:59:49,026 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 224 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 224 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:49,053 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:59:49,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:49,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:49,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:49,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 19:59:49,261 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:49,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 23 treesize of output 49 [2021-07-13 19:59:49,263 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:49,279 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:49,280 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:49,280 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:46 [2021-07-13 19:59:49,438 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:49,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370251886] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:49,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:49,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 19:59:49,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889913016] [2021-07-13 19:59:49,439 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 19:59:49,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:49,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 19:59:49,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-07-13 19:59:49,440 INFO L87 Difference]: Start difference. First operand 1995 states and 7197 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:50,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:50,729 INFO L93 Difference]: Finished difference Result 2464 states and 8608 transitions. [2021-07-13 19:59:50,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 19:59:50,729 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:50,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:50,734 INFO L225 Difference]: With dead ends: 2464 [2021-07-13 19:59:50,734 INFO L226 Difference]: Without dead ends: 2445 [2021-07-13 19:59:50,734 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 1111.3ms TimeCoverageRelationStatistics Valid=298, Invalid=1682, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 19:59:50,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2445 states. [2021-07-13 19:59:50,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2445 to 2002. [2021-07-13 19:59:50,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2002 states, 2001 states have (on average 3.6081959020489753) internal successors, (7220), 2001 states have internal predecessors, (7220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:50,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2002 states to 2002 states and 7220 transitions. [2021-07-13 19:59:50,762 INFO L78 Accepts]: Start accepts. Automaton has 2002 states and 7220 transitions. Word has length 24 [2021-07-13 19:59:50,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:50,763 INFO L482 AbstractCegarLoop]: Abstraction has 2002 states and 7220 transitions. [2021-07-13 19:59:50,763 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:50,763 INFO L276 IsEmpty]: Start isEmpty. Operand 2002 states and 7220 transitions. [2021-07-13 19:59:50,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:50,765 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:50,765 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:50,966 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 224 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable401 [2021-07-13 19:59:50,966 INFO L430 AbstractCegarLoop]: === Iteration 236 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:50,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:50,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1766000712, now seen corresponding path program 118 times [2021-07-13 19:59:50,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:50,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245947929] [2021-07-13 19:59:50,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:50,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:51,176 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:51,177 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:51,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245947929] [2021-07-13 19:59:51,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245947929] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:51,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309411811] [2021-07-13 19:59:51,177 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 225 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 225 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:51,204 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:59:51,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:51,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:51,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:51,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:51,326 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:51,329 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:51,329 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:51,329 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 19:59:51,393 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:51,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309411811] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:51,394 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:51,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:51,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508555866] [2021-07-13 19:59:51,394 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:51,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:51,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:51,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:51,395 INFO L87 Difference]: Start difference. First operand 2002 states and 7220 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:52,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:52,277 INFO L93 Difference]: Finished difference Result 2479 states and 8688 transitions. [2021-07-13 19:59:52,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 19:59:52,277 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:52,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:52,281 INFO L225 Difference]: With dead ends: 2479 [2021-07-13 19:59:52,282 INFO L226 Difference]: Without dead ends: 2466 [2021-07-13 19:59:52,282 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 799.7ms TimeCoverageRelationStatistics Valid=274, Invalid=1532, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 19:59:52,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2466 states. [2021-07-13 19:59:52,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2466 to 2000. [2021-07-13 19:59:52,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2000 states, 1999 states have (on average 3.6088044022011005) internal successors, (7214), 1999 states have internal predecessors, (7214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:52,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2000 states to 2000 states and 7214 transitions. [2021-07-13 19:59:52,322 INFO L78 Accepts]: Start accepts. Automaton has 2000 states and 7214 transitions. Word has length 24 [2021-07-13 19:59:52,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:52,322 INFO L482 AbstractCegarLoop]: Abstraction has 2000 states and 7214 transitions. [2021-07-13 19:59:52,322 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:52,322 INFO L276 IsEmpty]: Start isEmpty. Operand 2000 states and 7214 transitions. [2021-07-13 19:59:52,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:52,325 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:52,325 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:52,525 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable406,225 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:52,526 INFO L430 AbstractCegarLoop]: === Iteration 237 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:52,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:52,526 INFO L82 PathProgramCache]: Analyzing trace with hash 933375312, now seen corresponding path program 119 times [2021-07-13 19:59:52,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:52,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063808017] [2021-07-13 19:59:52,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:52,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:52,705 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:52,706 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:52,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063808017] [2021-07-13 19:59:52,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063808017] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:52,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901471852] [2021-07-13 19:59:52,706 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 226 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 226 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:52,737 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:59:52,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:52,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:52,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:52,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:52,886 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:52,891 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:52,892 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:52,892 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:59:52,958 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:52,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [901471852] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:52,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:52,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:52,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392323735] [2021-07-13 19:59:52,959 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:52,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:52,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:52,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:52,959 INFO L87 Difference]: Start difference. First operand 2000 states and 7214 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:53,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:53,787 INFO L93 Difference]: Finished difference Result 2408 states and 8475 transitions. [2021-07-13 19:59:53,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 19:59:53,788 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:53,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:53,792 INFO L225 Difference]: With dead ends: 2408 [2021-07-13 19:59:53,792 INFO L226 Difference]: Without dead ends: 2399 [2021-07-13 19:59:53,792 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 750.7ms TimeCoverageRelationStatistics Valid=238, Invalid=1168, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 19:59:53,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2399 states. [2021-07-13 19:59:53,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2399 to 2002. [2021-07-13 19:59:53,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2002 states, 2001 states have (on average 3.608695652173913) internal successors, (7221), 2001 states have internal predecessors, (7221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:53,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2002 states to 2002 states and 7221 transitions. [2021-07-13 19:59:53,821 INFO L78 Accepts]: Start accepts. Automaton has 2002 states and 7221 transitions. Word has length 24 [2021-07-13 19:59:53,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:53,821 INFO L482 AbstractCegarLoop]: Abstraction has 2002 states and 7221 transitions. [2021-07-13 19:59:53,821 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:53,821 INFO L276 IsEmpty]: Start isEmpty. Operand 2002 states and 7221 transitions. [2021-07-13 19:59:53,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:53,824 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:53,825 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:54,042 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 226 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable407 [2021-07-13 19:59:54,043 INFO L430 AbstractCegarLoop]: === Iteration 238 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:54,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:54,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1256961490, now seen corresponding path program 120 times [2021-07-13 19:59:54,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:54,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113577541] [2021-07-13 19:59:54,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:54,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:54,204 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:54,204 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:54,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113577541] [2021-07-13 19:59:54,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113577541] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:54,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049281427] [2021-07-13 19:59:54,204 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 227 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 227 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:54,232 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:59:54,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:54,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 19:59:54,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:54,346 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:54,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 19:59:54,347 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:54,358 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:54,359 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:54,359 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 19:59:54,481 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:54,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049281427] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:54,481 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:54,481 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 19:59:54,481 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835958884] [2021-07-13 19:59:54,481 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 19:59:54,481 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:54,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 19:59:54,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-07-13 19:59:54,482 INFO L87 Difference]: Start difference. First operand 2002 states and 7221 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:55,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:55,671 INFO L93 Difference]: Finished difference Result 2501 states and 8707 transitions. [2021-07-13 19:59:55,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 19:59:55,671 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:55,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:55,676 INFO L225 Difference]: With dead ends: 2501 [2021-07-13 19:59:55,676 INFO L226 Difference]: Without dead ends: 2482 [2021-07-13 19:59:55,676 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 543 ImplicationChecksByTransitivity, 1058.4ms TimeCoverageRelationStatistics Valid=355, Invalid=1537, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 19:59:55,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2482 states. [2021-07-13 19:59:55,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2482 to 2006. [2021-07-13 19:59:55,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2006 states, 2005 states have (on average 3.6099750623441396) internal successors, (7238), 2005 states have internal predecessors, (7238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:55,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2006 states to 2006 states and 7238 transitions. [2021-07-13 19:59:55,706 INFO L78 Accepts]: Start accepts. Automaton has 2006 states and 7238 transitions. Word has length 24 [2021-07-13 19:59:55,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:55,706 INFO L482 AbstractCegarLoop]: Abstraction has 2006 states and 7238 transitions. [2021-07-13 19:59:55,706 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:55,706 INFO L276 IsEmpty]: Start isEmpty. Operand 2006 states and 7238 transitions. [2021-07-13 19:59:55,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:55,709 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:55,709 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:55,909 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable408,227 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:55,910 INFO L430 AbstractCegarLoop]: === Iteration 239 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:55,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:55,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1352261684, now seen corresponding path program 121 times [2021-07-13 19:59:55,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:55,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765826627] [2021-07-13 19:59:55,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:55,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:56,063 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:56,064 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:56,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765826627] [2021-07-13 19:59:56,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765826627] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:56,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748329191] [2021-07-13 19:59:56,064 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 228 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 228 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:56,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:56,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:56,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:56,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:56,228 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:56,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:56,232 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:56,233 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:59:56,307 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:56,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748329191] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:56,308 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:56,308 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 19:59:56,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215694830] [2021-07-13 19:59:56,308 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 19:59:56,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:56,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 19:59:56,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-07-13 19:59:56,308 INFO L87 Difference]: Start difference. First operand 2006 states and 7238 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:57,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:57,004 INFO L93 Difference]: Finished difference Result 2370 states and 8354 transitions. [2021-07-13 19:59:57,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 19:59:57,004 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:57,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:57,009 INFO L225 Difference]: With dead ends: 2370 [2021-07-13 19:59:57,009 INFO L226 Difference]: Without dead ends: 2359 [2021-07-13 19:59:57,009 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 640.2ms TimeCoverageRelationStatistics Valid=181, Invalid=941, Unknown=0, NotChecked=0, Total=1122 [2021-07-13 19:59:57,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2359 states. [2021-07-13 19:59:57,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2359 to 2004. [2021-07-13 19:59:57,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2004 states, 2003 states have (on average 3.6090863704443334) internal successors, (7229), 2003 states have internal predecessors, (7229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:57,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2004 states to 2004 states and 7229 transitions. [2021-07-13 19:59:57,037 INFO L78 Accepts]: Start accepts. Automaton has 2004 states and 7229 transitions. Word has length 24 [2021-07-13 19:59:57,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:57,037 INFO L482 AbstractCegarLoop]: Abstraction has 2004 states and 7229 transitions. [2021-07-13 19:59:57,037 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:57,037 INFO L276 IsEmpty]: Start isEmpty. Operand 2004 states and 7229 transitions. [2021-07-13 19:59:57,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:57,040 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:57,040 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:57,240 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 228 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable411 [2021-07-13 19:59:57,241 INFO L430 AbstractCegarLoop]: === Iteration 240 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:57,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:57,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1230452128, now seen corresponding path program 122 times [2021-07-13 19:59:57,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:57,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315237217] [2021-07-13 19:59:57,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:57,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:57,399 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:57,399 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:57,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315237217] [2021-07-13 19:59:57,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315237217] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:57,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569302096] [2021-07-13 19:59:57,400 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 229 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 229 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:57,428 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:59:57,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:57,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 19:59:57,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:57,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 19:59:57,548 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:57,552 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:57,553 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:57,553 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 19:59:57,615 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:57,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569302096] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:57,616 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:59:57,616 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 19:59:57,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329545597] [2021-07-13 19:59:57,616 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 19:59:57,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:59:57,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 19:59:57,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:59:57,616 INFO L87 Difference]: Start difference. First operand 2004 states and 7229 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:58,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:59:58,518 INFO L93 Difference]: Finished difference Result 2441 states and 8576 transitions. [2021-07-13 19:59:58,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 19:59:58,518 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 19:59:58,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:59:58,523 INFO L225 Difference]: With dead ends: 2441 [2021-07-13 19:59:58,523 INFO L226 Difference]: Without dead ends: 2432 [2021-07-13 19:59:58,523 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 737.6ms TimeCoverageRelationStatistics Valid=253, Invalid=1307, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 19:59:58,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2432 states. [2021-07-13 19:59:58,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2432 to 2005. [2021-07-13 19:59:58,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2005 states, 2004 states have (on average 3.6092814371257487) internal successors, (7233), 2004 states have internal predecessors, (7233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:58,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2005 states to 2005 states and 7233 transitions. [2021-07-13 19:59:58,552 INFO L78 Accepts]: Start accepts. Automaton has 2005 states and 7233 transitions. Word has length 24 [2021-07-13 19:59:58,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:59:58,552 INFO L482 AbstractCegarLoop]: Abstraction has 2005 states and 7233 transitions. [2021-07-13 19:59:58,552 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:59:58,552 INFO L276 IsEmpty]: Start isEmpty. Operand 2005 states and 7233 transitions. [2021-07-13 19:59:58,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 19:59:58,555 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:59:58,555 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:59:58,755 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 229 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable412 [2021-07-13 19:59:58,755 INFO L430 AbstractCegarLoop]: === Iteration 241 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 19:59:58,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:59:58,756 INFO L82 PathProgramCache]: Analyzing trace with hash 221424754, now seen corresponding path program 123 times [2021-07-13 19:59:58,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:59:58,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210256381] [2021-07-13 19:59:58,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:59:58,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:59:58,921 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:59:58,922 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:59:58,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210256381] [2021-07-13 19:59:58,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210256381] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:59:58,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885628462] [2021-07-13 19:59:58,922 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 230 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 230 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:59:58,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-13 19:59:58,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:59:58,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 27 conjunts are in the unsatisfiable core [2021-07-13 19:59:58,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:59:59,087 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:59,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 61 [2021-07-13 19:59:59,089 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:59:59,119 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:59:59,375 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:59:59,375 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:40, output treesize:1840 [2021-07-13 19:59:59,953 WARN L205 SmtUtils]: Spent 451.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 58 [2021-07-13 20:00:00,188 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 37 [2021-07-13 20:00:00,260 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:00,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885628462] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:00,260 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:00,260 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 20:00:00,260 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942171345] [2021-07-13 20:00:00,260 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:00:00,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:00,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:00:00,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:00:00,261 INFO L87 Difference]: Start difference. First operand 2005 states and 7233 transitions. Second operand has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:00,654 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 38 [2021-07-13 20:00:01,497 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 68 [2021-07-13 20:00:01,668 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 46 [2021-07-13 20:00:02,124 WARN L205 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 54 [2021-07-13 20:00:02,285 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 52 [2021-07-13 20:00:02,473 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 53 [2021-07-13 20:00:02,743 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 32 [2021-07-13 20:00:02,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:02,865 INFO L93 Difference]: Finished difference Result 2333 states and 8246 transitions. [2021-07-13 20:00:02,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 20:00:02,865 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:02,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:02,871 INFO L225 Difference]: With dead ends: 2333 [2021-07-13 20:00:02,871 INFO L226 Difference]: Without dead ends: 2323 [2021-07-13 20:00:02,871 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 2976.6ms TimeCoverageRelationStatistics Valid=326, Invalid=1930, Unknown=0, NotChecked=0, Total=2256 [2021-07-13 20:00:02,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2323 states. [2021-07-13 20:00:02,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2323 to 2007. [2021-07-13 20:00:02,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2007 states, 2006 states have (on average 3.610169491525424) internal successors, (7242), 2006 states have internal predecessors, (7242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:02,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2007 states to 2007 states and 7242 transitions. [2021-07-13 20:00:02,913 INFO L78 Accepts]: Start accepts. Automaton has 2007 states and 7242 transitions. Word has length 24 [2021-07-13 20:00:02,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:02,913 INFO L482 AbstractCegarLoop]: Abstraction has 2007 states and 7242 transitions. [2021-07-13 20:00:02,913 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:02,913 INFO L276 IsEmpty]: Start isEmpty. Operand 2007 states and 7242 transitions. [2021-07-13 20:00:02,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:02,917 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:02,917 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:03,140 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 230 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable413 [2021-07-13 20:00:03,140 INFO L430 AbstractCegarLoop]: === Iteration 242 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:03,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:03,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1940929934, now seen corresponding path program 124 times [2021-07-13 20:00:03,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:03,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115244182] [2021-07-13 20:00:03,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:03,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:03,363 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:03,363 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:03,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115244182] [2021-07-13 20:00:03,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2115244182] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:03,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355316112] [2021-07-13 20:00:03,363 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 231 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 231 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:03,398 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:00:03,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:03,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:03,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:03,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:00:03,530 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:03,534 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:03,534 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:03,534 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:00:03,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:03,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355316112] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:03,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:03,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:00:03,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521796436] [2021-07-13 20:00:03,606 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:00:03,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:03,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:00:03,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:00:03,606 INFO L87 Difference]: Start difference. First operand 2007 states and 7242 transitions. Second operand has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:04,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:04,339 INFO L93 Difference]: Finished difference Result 2425 states and 8523 transitions. [2021-07-13 20:00:04,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 20:00:04,339 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:04,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:04,345 INFO L225 Difference]: With dead ends: 2425 [2021-07-13 20:00:04,345 INFO L226 Difference]: Without dead ends: 2416 [2021-07-13 20:00:04,346 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 713.9ms TimeCoverageRelationStatistics Valid=236, Invalid=1170, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 20:00:04,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2416 states. [2021-07-13 20:00:04,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2416 to 2006. [2021-07-13 20:00:04,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2006 states, 2005 states have (on average 3.6099750623441396) internal successors, (7238), 2005 states have internal predecessors, (7238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:04,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2006 states to 2006 states and 7238 transitions. [2021-07-13 20:00:04,386 INFO L78 Accepts]: Start accepts. Automaton has 2006 states and 7238 transitions. Word has length 24 [2021-07-13 20:00:04,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:04,386 INFO L482 AbstractCegarLoop]: Abstraction has 2006 states and 7238 transitions. [2021-07-13 20:00:04,386 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:04,386 INFO L276 IsEmpty]: Start isEmpty. Operand 2006 states and 7238 transitions. [2021-07-13 20:00:04,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:04,390 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:04,390 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:04,609 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 231 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable451 [2021-07-13 20:00:04,609 INFO L430 AbstractCegarLoop]: === Iteration 243 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:04,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:04,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1166480298, now seen corresponding path program 125 times [2021-07-13 20:00:04,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:04,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453099790] [2021-07-13 20:00:04,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:04,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:04,795 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:04,796 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:04,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453099790] [2021-07-13 20:00:04,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453099790] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:04,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825060637] [2021-07-13 20:00:04,796 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 232 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 232 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:04,829 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:00:04,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:04,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:04,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:04,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:00:04,977 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:04,982 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:04,982 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:04,983 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:00:05,055 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:05,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825060637] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:05,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:05,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:00:05,056 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496922950] [2021-07-13 20:00:05,056 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:00:05,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:05,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:00:05,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:00:05,056 INFO L87 Difference]: Start difference. First operand 2006 states and 7238 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:05,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:05,895 INFO L93 Difference]: Finished difference Result 2401 states and 8458 transitions. [2021-07-13 20:00:05,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 20:00:05,895 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:05,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:05,900 INFO L225 Difference]: With dead ends: 2401 [2021-07-13 20:00:05,900 INFO L226 Difference]: Without dead ends: 2390 [2021-07-13 20:00:05,900 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 754.1ms TimeCoverageRelationStatistics Valid=205, Invalid=1055, Unknown=0, NotChecked=0, Total=1260 [2021-07-13 20:00:05,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2390 states. [2021-07-13 20:00:05,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2390 to 2008. [2021-07-13 20:00:05,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2008 states, 2007 states have (on average 3.6093672147483806) internal successors, (7244), 2007 states have internal predecessors, (7244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:05,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2008 states to 2008 states and 7244 transitions. [2021-07-13 20:00:05,931 INFO L78 Accepts]: Start accepts. Automaton has 2008 states and 7244 transitions. Word has length 24 [2021-07-13 20:00:05,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:05,931 INFO L482 AbstractCegarLoop]: Abstraction has 2008 states and 7244 transitions. [2021-07-13 20:00:05,931 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:05,931 INFO L276 IsEmpty]: Start isEmpty. Operand 2008 states and 7244 transitions. [2021-07-13 20:00:05,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:05,934 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:05,934 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:06,135 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 232 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable452 [2021-07-13 20:00:06,135 INFO L430 AbstractCegarLoop]: === Iteration 244 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:06,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:06,135 INFO L82 PathProgramCache]: Analyzing trace with hash 2145894746, now seen corresponding path program 126 times [2021-07-13 20:00:06,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:06,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683513307] [2021-07-13 20:00:06,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:06,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:06,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:06,359 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:06,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683513307] [2021-07-13 20:00:06,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683513307] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:06,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112269566] [2021-07-13 20:00:06,359 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 233 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 233 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:06,386 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:00:06,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:06,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:00:06,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:06,524 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:06,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:00:06,526 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:06,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:06,537 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:06,537 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:00:06,681 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:06,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112269566] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:06,682 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:06,682 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:00:06,682 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526606121] [2021-07-13 20:00:06,682 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:00:06,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:06,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:00:06,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:00:06,683 INFO L87 Difference]: Start difference. First operand 2008 states and 7244 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:07,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:07,924 INFO L93 Difference]: Finished difference Result 2511 states and 8723 transitions. [2021-07-13 20:00:07,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-07-13 20:00:07,924 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:07,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:07,929 INFO L225 Difference]: With dead ends: 2511 [2021-07-13 20:00:07,929 INFO L226 Difference]: Without dead ends: 2492 [2021-07-13 20:00:07,929 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 1177.1ms TimeCoverageRelationStatistics Valid=374, Invalid=1696, Unknown=0, NotChecked=0, Total=2070 [2021-07-13 20:00:07,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2492 states. [2021-07-13 20:00:07,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2492 to 2010. [2021-07-13 20:00:07,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2010 states, 2009 states have (on average 3.6102538576406173) internal successors, (7253), 2009 states have internal predecessors, (7253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:07,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2010 states to 2010 states and 7253 transitions. [2021-07-13 20:00:07,963 INFO L78 Accepts]: Start accepts. Automaton has 2010 states and 7253 transitions. Word has length 24 [2021-07-13 20:00:07,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:07,963 INFO L482 AbstractCegarLoop]: Abstraction has 2010 states and 7253 transitions. [2021-07-13 20:00:07,963 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:07,963 INFO L276 IsEmpty]: Start isEmpty. Operand 2010 states and 7253 transitions. [2021-07-13 20:00:07,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:07,967 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:07,967 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:08,180 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 233 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable453 [2021-07-13 20:00:08,181 INFO L430 AbstractCegarLoop]: === Iteration 245 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:08,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:08,181 INFO L82 PathProgramCache]: Analyzing trace with hash -428282352, now seen corresponding path program 127 times [2021-07-13 20:00:08,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:08,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735604813] [2021-07-13 20:00:08,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:08,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:08,424 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:08,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:08,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735604813] [2021-07-13 20:00:08,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735604813] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:08,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463117799] [2021-07-13 20:00:08,425 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 234 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 234 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:08,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:08,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:08,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:08,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:00:08,576 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:08,581 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:08,581 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:08,581 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:00:08,649 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:08,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463117799] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:08,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:08,649 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:00:08,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582783657] [2021-07-13 20:00:08,650 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:00:08,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:08,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:00:08,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:00:08,650 INFO L87 Difference]: Start difference. First operand 2010 states and 7253 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:09,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:09,320 INFO L93 Difference]: Finished difference Result 2354 states and 8315 transitions. [2021-07-13 20:00:09,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-07-13 20:00:09,320 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:09,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:09,325 INFO L225 Difference]: With dead ends: 2354 [2021-07-13 20:00:09,325 INFO L226 Difference]: Without dead ends: 2344 [2021-07-13 20:00:09,325 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 649.6ms TimeCoverageRelationStatistics Valid=171, Invalid=885, Unknown=0, NotChecked=0, Total=1056 [2021-07-13 20:00:09,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2344 states. [2021-07-13 20:00:09,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2344 to 2008. [2021-07-13 20:00:09,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2008 states, 2007 states have (on average 3.610363726955655) internal successors, (7246), 2007 states have internal predecessors, (7246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:09,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2008 states to 2008 states and 7246 transitions. [2021-07-13 20:00:09,364 INFO L78 Accepts]: Start accepts. Automaton has 2008 states and 7246 transitions. Word has length 24 [2021-07-13 20:00:09,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:09,364 INFO L482 AbstractCegarLoop]: Abstraction has 2008 states and 7246 transitions. [2021-07-13 20:00:09,365 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:09,365 INFO L276 IsEmpty]: Start isEmpty. Operand 2008 states and 7246 transitions. [2021-07-13 20:00:09,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:09,367 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:09,368 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:09,568 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable456,234 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:09,568 INFO L430 AbstractCegarLoop]: === Iteration 246 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:09,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:09,568 INFO L82 PathProgramCache]: Analyzing trace with hash 1107281254, now seen corresponding path program 84 times [2021-07-13 20:00:09,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:09,569 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145630965] [2021-07-13 20:00:09,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:09,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:09,815 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:09,815 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:09,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145630965] [2021-07-13 20:00:09,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145630965] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:09,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886830719] [2021-07-13 20:00:09,815 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 235 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 235 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:09,846 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:00:09,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:09,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:09,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:10,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:00:10,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:00:10,069 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:10,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 38 [2021-07-13 20:00:10,072 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 20:00:10,080 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:10,080 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:10,080 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:22 [2021-07-13 20:00:10,150 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:10,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886830719] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:10,150 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:10,150 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 20:00:10,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377520359] [2021-07-13 20:00:10,150 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 20:00:10,150 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:10,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 20:00:10,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2021-07-13 20:00:10,151 INFO L87 Difference]: Start difference. First operand 2008 states and 7246 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:12,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:12,439 INFO L93 Difference]: Finished difference Result 2660 states and 9152 transitions. [2021-07-13 20:00:12,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-07-13 20:00:12,439 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:12,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:12,447 INFO L225 Difference]: With dead ends: 2660 [2021-07-13 20:00:12,447 INFO L226 Difference]: Without dead ends: 2590 [2021-07-13 20:00:12,447 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 1840.8ms TimeCoverageRelationStatistics Valid=377, Invalid=2593, Unknown=0, NotChecked=0, Total=2970 [2021-07-13 20:00:12,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2590 states. [2021-07-13 20:00:12,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2590 to 2017. [2021-07-13 20:00:12,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2017 states, 2016 states have (on average 3.6086309523809526) internal successors, (7275), 2016 states have internal predecessors, (7275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:12,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2017 states to 2017 states and 7275 transitions. [2021-07-13 20:00:12,491 INFO L78 Accepts]: Start accepts. Automaton has 2017 states and 7275 transitions. Word has length 24 [2021-07-13 20:00:12,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:12,492 INFO L482 AbstractCegarLoop]: Abstraction has 2017 states and 7275 transitions. [2021-07-13 20:00:12,492 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:12,492 INFO L276 IsEmpty]: Start isEmpty. Operand 2017 states and 7275 transitions. [2021-07-13 20:00:12,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:12,496 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:12,496 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:12,709 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 235 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable457 [2021-07-13 20:00:12,709 INFO L430 AbstractCegarLoop]: === Iteration 247 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:12,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:12,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1923388560, now seen corresponding path program 85 times [2021-07-13 20:00:12,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:12,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599968166] [2021-07-13 20:00:12,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:12,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:12,967 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:12,968 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:12,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599968166] [2021-07-13 20:00:12,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599968166] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:12,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811419728] [2021-07-13 20:00:12,968 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 236 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 236 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:13,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:13,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:13,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:13,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:00:13,336 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:13,338 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:13,339 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:13,339 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:00:13,379 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:13,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811419728] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:13,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:13,380 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:00:13,380 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795828752] [2021-07-13 20:00:13,380 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:00:13,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:13,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:00:13,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:00:13,381 INFO L87 Difference]: Start difference. First operand 2017 states and 7275 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:13,733 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2021-07-13 20:00:15,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:15,866 INFO L93 Difference]: Finished difference Result 2582 states and 8988 transitions. [2021-07-13 20:00:15,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-07-13 20:00:15,866 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:15,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:15,872 INFO L225 Difference]: With dead ends: 2582 [2021-07-13 20:00:15,872 INFO L226 Difference]: Without dead ends: 2540 [2021-07-13 20:00:15,873 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 2200.3ms TimeCoverageRelationStatistics Valid=435, Invalid=2535, Unknown=0, NotChecked=0, Total=2970 [2021-07-13 20:00:15,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2540 states. [2021-07-13 20:00:15,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2540 to 2020. [2021-07-13 20:00:15,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2020 states, 2019 states have (on average 3.6077265973254087) internal successors, (7284), 2019 states have internal predecessors, (7284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:15,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2020 states to 2020 states and 7284 transitions. [2021-07-13 20:00:15,917 INFO L78 Accepts]: Start accepts. Automaton has 2020 states and 7284 transitions. Word has length 24 [2021-07-13 20:00:15,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:15,918 INFO L482 AbstractCegarLoop]: Abstraction has 2020 states and 7284 transitions. [2021-07-13 20:00:15,918 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:15,918 INFO L276 IsEmpty]: Start isEmpty. Operand 2020 states and 7284 transitions. [2021-07-13 20:00:15,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:15,938 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:15,938 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:16,157 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable461,236 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:16,157 INFO L430 AbstractCegarLoop]: === Iteration 248 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:16,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:16,157 INFO L82 PathProgramCache]: Analyzing trace with hash -2099929992, now seen corresponding path program 86 times [2021-07-13 20:00:16,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:16,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679714784] [2021-07-13 20:00:16,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:16,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:16,433 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:16,433 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:16,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679714784] [2021-07-13 20:00:16,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679714784] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:16,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956657377] [2021-07-13 20:00:16,434 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 237 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 237 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:16,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:00:16,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:16,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:00:16,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:16,704 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:16,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:00:16,706 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:16,717 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:16,718 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:16,718 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:00:16,812 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:16,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956657377] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:16,813 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:16,813 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:00:16,813 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512570453] [2021-07-13 20:00:16,813 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:00:16,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:16,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:00:16,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:00:16,813 INFO L87 Difference]: Start difference. First operand 2020 states and 7284 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:17,124 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2021-07-13 20:00:19,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:19,277 INFO L93 Difference]: Finished difference Result 2539 states and 8854 transitions. [2021-07-13 20:00:19,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-07-13 20:00:19,277 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:19,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:19,284 INFO L225 Difference]: With dead ends: 2539 [2021-07-13 20:00:19,284 INFO L226 Difference]: Without dead ends: 2493 [2021-07-13 20:00:19,284 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 2253.0ms TimeCoverageRelationStatistics Valid=513, Invalid=2909, Unknown=0, NotChecked=0, Total=3422 [2021-07-13 20:00:19,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2493 states. [2021-07-13 20:00:19,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2493 to 2027. [2021-07-13 20:00:19,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2027 states, 2026 states have (on average 3.6076011846001976) internal successors, (7309), 2026 states have internal predecessors, (7309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:19,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2027 states to 2027 states and 7309 transitions. [2021-07-13 20:00:19,325 INFO L78 Accepts]: Start accepts. Automaton has 2027 states and 7309 transitions. Word has length 24 [2021-07-13 20:00:19,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:19,326 INFO L482 AbstractCegarLoop]: Abstraction has 2027 states and 7309 transitions. [2021-07-13 20:00:19,326 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:19,326 INFO L276 IsEmpty]: Start isEmpty. Operand 2027 states and 7309 transitions. [2021-07-13 20:00:19,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:19,330 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:19,330 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:19,554 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable462,237 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:19,554 INFO L430 AbstractCegarLoop]: === Iteration 249 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:19,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:19,555 INFO L82 PathProgramCache]: Analyzing trace with hash 1361298864, now seen corresponding path program 87 times [2021-07-13 20:00:19,555 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:19,555 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368425467] [2021-07-13 20:00:19,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:19,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:19,783 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:19,784 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:19,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368425467] [2021-07-13 20:00:19,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368425467] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:19,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359764015] [2021-07-13 20:00:19,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 238 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 238 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:19,825 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:00:19,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:19,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:00:19,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:19,979 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:19,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:00:19,981 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:19,992 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:19,993 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:19,993 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:00:20,110 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:20,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359764015] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:20,110 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:20,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:00:20,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701028082] [2021-07-13 20:00:20,110 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:00:20,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:20,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:00:20,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:00:20,111 INFO L87 Difference]: Start difference. First operand 2027 states and 7309 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:20,430 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 50 [2021-07-13 20:00:22,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:22,157 INFO L93 Difference]: Finished difference Result 2478 states and 8649 transitions. [2021-07-13 20:00:22,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-07-13 20:00:22,158 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:22,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:22,164 INFO L225 Difference]: With dead ends: 2478 [2021-07-13 20:00:22,164 INFO L226 Difference]: Without dead ends: 2457 [2021-07-13 20:00:22,164 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 1832.9ms TimeCoverageRelationStatistics Valid=374, Invalid=2076, Unknown=0, NotChecked=0, Total=2450 [2021-07-13 20:00:22,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2457 states. [2021-07-13 20:00:22,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2457 to 2026. [2021-07-13 20:00:22,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2026 states, 2025 states have (on average 3.608395061728395) internal successors, (7307), 2025 states have internal predecessors, (7307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:22,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2026 states to 2026 states and 7307 transitions. [2021-07-13 20:00:22,206 INFO L78 Accepts]: Start accepts. Automaton has 2026 states and 7307 transitions. Word has length 24 [2021-07-13 20:00:22,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:22,206 INFO L482 AbstractCegarLoop]: Abstraction has 2026 states and 7307 transitions. [2021-07-13 20:00:22,206 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:22,206 INFO L276 IsEmpty]: Start isEmpty. Operand 2026 states and 7307 transitions. [2021-07-13 20:00:22,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:22,210 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:22,210 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:22,425 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable464,238 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:22,425 INFO L430 AbstractCegarLoop]: === Iteration 250 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:22,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:22,425 INFO L82 PathProgramCache]: Analyzing trace with hash 2143132664, now seen corresponding path program 88 times [2021-07-13 20:00:22,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:22,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1501746435] [2021-07-13 20:00:22,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:22,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:22,642 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:22,642 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:22,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1501746435] [2021-07-13 20:00:22,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1501746435] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:22,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828921629] [2021-07-13 20:00:22,642 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 239 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 239 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:22,677 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:00:22,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:22,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:22,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:22,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:00:22,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:22,829 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:22,830 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:22,830 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:00:22,881 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:22,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828921629] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:22,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:22,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:00:22,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532951037] [2021-07-13 20:00:22,882 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:00:22,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:22,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:00:22,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:00:22,883 INFO L87 Difference]: Start difference. First operand 2026 states and 7307 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:23,159 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2021-07-13 20:00:24,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:24,499 INFO L93 Difference]: Finished difference Result 2424 states and 8516 transitions. [2021-07-13 20:00:24,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 20:00:24,500 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:24,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:24,506 INFO L225 Difference]: With dead ends: 2424 [2021-07-13 20:00:24,506 INFO L226 Difference]: Without dead ends: 2407 [2021-07-13 20:00:24,507 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 1393.7ms TimeCoverageRelationStatistics Valid=283, Invalid=1609, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 20:00:24,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2407 states. [2021-07-13 20:00:24,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2407 to 2023. [2021-07-13 20:00:24,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2023 states, 2022 states have (on average 3.609297725024728) internal successors, (7298), 2022 states have internal predecessors, (7298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:24,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2023 states to 2023 states and 7298 transitions. [2021-07-13 20:00:24,548 INFO L78 Accepts]: Start accepts. Automaton has 2023 states and 7298 transitions. Word has length 24 [2021-07-13 20:00:24,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:24,548 INFO L482 AbstractCegarLoop]: Abstraction has 2023 states and 7298 transitions. [2021-07-13 20:00:24,548 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:24,548 INFO L276 IsEmpty]: Start isEmpty. Operand 2023 states and 7298 transitions. [2021-07-13 20:00:24,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:24,551 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:24,552 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:24,772 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable467,239 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:24,773 INFO L430 AbstractCegarLoop]: === Iteration 251 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:24,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:24,773 INFO L82 PathProgramCache]: Analyzing trace with hash -460321124, now seen corresponding path program 128 times [2021-07-13 20:00:24,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:24,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916899030] [2021-07-13 20:00:24,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:24,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:25,055 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:25,057 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:25,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916899030] [2021-07-13 20:00:25,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916899030] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:25,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406655986] [2021-07-13 20:00:25,057 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 240 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 240 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:25,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:00:25,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:25,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:00:25,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:25,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:00:25,402 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:00:25,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:00:25,403 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:25,408 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:25,409 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:25,409 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 20:00:25,464 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:25,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406655986] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:25,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:25,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:00:25,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012819600] [2021-07-13 20:00:25,465 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:00:25,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:25,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:00:25,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:00:25,466 INFO L87 Difference]: Start difference. First operand 2023 states and 7298 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:25,949 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 47 [2021-07-13 20:00:28,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:28,147 INFO L93 Difference]: Finished difference Result 2630 states and 9090 transitions. [2021-07-13 20:00:28,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-07-13 20:00:28,147 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:28,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:28,154 INFO L225 Difference]: With dead ends: 2630 [2021-07-13 20:00:28,154 INFO L226 Difference]: Without dead ends: 2580 [2021-07-13 20:00:28,155 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 2122.3ms TimeCoverageRelationStatistics Valid=397, Invalid=2359, Unknown=0, NotChecked=0, Total=2756 [2021-07-13 20:00:28,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2580 states. [2021-07-13 20:00:28,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2580 to 2026. [2021-07-13 20:00:28,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2026 states, 2025 states have (on average 3.608888888888889) internal successors, (7308), 2025 states have internal predecessors, (7308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:28,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2026 states to 2026 states and 7308 transitions. [2021-07-13 20:00:28,198 INFO L78 Accepts]: Start accepts. Automaton has 2026 states and 7308 transitions. Word has length 24 [2021-07-13 20:00:28,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:28,198 INFO L482 AbstractCegarLoop]: Abstraction has 2026 states and 7308 transitions. [2021-07-13 20:00:28,198 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:28,198 INFO L276 IsEmpty]: Start isEmpty. Operand 2026 states and 7308 transitions. [2021-07-13 20:00:28,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:28,202 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:28,202 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:28,421 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 240 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable468 [2021-07-13 20:00:28,422 INFO L430 AbstractCegarLoop]: === Iteration 252 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:28,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:28,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1268350622, now seen corresponding path program 129 times [2021-07-13 20:00:28,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:28,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961700047] [2021-07-13 20:00:28,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:28,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:28,758 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:28,758 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:28,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961700047] [2021-07-13 20:00:28,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961700047] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:28,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526224061] [2021-07-13 20:00:28,759 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 241 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 241 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:28,797 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 20:00:28,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:28,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:00:28,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:29,031 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:29,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:00:29,033 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:29,042 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:29,043 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:29,043 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:00:29,133 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:29,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526224061] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:29,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:29,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:00:29,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706612345] [2021-07-13 20:00:29,134 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:00:29,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:29,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:00:29,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:00:29,135 INFO L87 Difference]: Start difference. First operand 2026 states and 7308 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:29,474 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 57 [2021-07-13 20:00:31,399 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 53 [2021-07-13 20:00:32,098 WARN L205 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 43 [2021-07-13 20:00:32,524 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 51 [2021-07-13 20:00:32,867 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 37 [2021-07-13 20:00:32,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:32,920 INFO L93 Difference]: Finished difference Result 2613 states and 9074 transitions. [2021-07-13 20:00:32,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-07-13 20:00:32,920 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:32,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:32,926 INFO L225 Difference]: With dead ends: 2613 [2021-07-13 20:00:32,927 INFO L226 Difference]: Without dead ends: 2574 [2021-07-13 20:00:32,927 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1170 ImplicationChecksByTransitivity, 3376.5ms TimeCoverageRelationStatistics Valid=606, Invalid=3554, Unknown=0, NotChecked=0, Total=4160 [2021-07-13 20:00:32,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2574 states. [2021-07-13 20:00:32,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2574 to 2029. [2021-07-13 20:00:32,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2029 states, 2028 states have (on average 3.608481262327416) internal successors, (7318), 2028 states have internal predecessors, (7318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:32,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2029 states to 2029 states and 7318 transitions. [2021-07-13 20:00:32,971 INFO L78 Accepts]: Start accepts. Automaton has 2029 states and 7318 transitions. Word has length 24 [2021-07-13 20:00:32,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:32,971 INFO L482 AbstractCegarLoop]: Abstraction has 2029 states and 7318 transitions. [2021-07-13 20:00:32,971 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:32,971 INFO L276 IsEmpty]: Start isEmpty. Operand 2029 states and 7318 transitions. [2021-07-13 20:00:32,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:32,975 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:32,975 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:33,195 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable469,241 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:33,196 INFO L430 AbstractCegarLoop]: === Iteration 253 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:33,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:33,196 INFO L82 PathProgramCache]: Analyzing trace with hash 240200762, now seen corresponding path program 130 times [2021-07-13 20:00:33,196 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:33,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547938975] [2021-07-13 20:00:33,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:33,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:33,458 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:33,459 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:33,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547938975] [2021-07-13 20:00:33,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547938975] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:33,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364371365] [2021-07-13 20:00:33,459 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 242 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 242 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:33,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:00:33,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:33,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:33,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:33,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:00:33,645 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:33,649 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:33,649 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:33,649 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:00:33,702 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:33,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364371365] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:33,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:33,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:00:33,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608742553] [2021-07-13 20:00:33,703 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:00:33,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:33,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:00:33,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:00:33,704 INFO L87 Difference]: Start difference. First operand 2029 states and 7318 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:34,011 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-07-13 20:00:34,610 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 35 [2021-07-13 20:00:35,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:35,438 INFO L93 Difference]: Finished difference Result 2464 states and 8660 transitions. [2021-07-13 20:00:35,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-07-13 20:00:35,438 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:35,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:35,444 INFO L225 Difference]: With dead ends: 2464 [2021-07-13 20:00:35,444 INFO L226 Difference]: Without dead ends: 2438 [2021-07-13 20:00:35,445 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 1602.0ms TimeCoverageRelationStatistics Valid=384, Invalid=1872, Unknown=0, NotChecked=0, Total=2256 [2021-07-13 20:00:35,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2438 states. [2021-07-13 20:00:35,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2438 to 2032. [2021-07-13 20:00:35,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2032 states, 2031 states have (on average 3.6070901033973413) internal successors, (7326), 2031 states have internal predecessors, (7326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:35,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2032 states to 2032 states and 7326 transitions. [2021-07-13 20:00:35,485 INFO L78 Accepts]: Start accepts. Automaton has 2032 states and 7326 transitions. Word has length 24 [2021-07-13 20:00:35,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:35,485 INFO L482 AbstractCegarLoop]: Abstraction has 2032 states and 7326 transitions. [2021-07-13 20:00:35,485 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:35,485 INFO L276 IsEmpty]: Start isEmpty. Operand 2032 states and 7326 transitions. [2021-07-13 20:00:35,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:35,489 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:35,489 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:35,712 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable472,242 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:35,713 INFO L430 AbstractCegarLoop]: === Iteration 254 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:35,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:35,713 INFO L82 PathProgramCache]: Analyzing trace with hash 563786940, now seen corresponding path program 131 times [2021-07-13 20:00:35,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:35,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780663272] [2021-07-13 20:00:35,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:35,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:35,980 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:35,981 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:35,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780663272] [2021-07-13 20:00:35,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780663272] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:35,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234400556] [2021-07-13 20:00:35,981 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 243 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 243 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:36,015 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:00:36,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:36,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:36,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:36,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:00:36,172 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:36,178 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:36,179 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:36,179 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:00:36,234 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:36,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234400556] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:36,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:36,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:00:36,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019112325] [2021-07-13 20:00:36,235 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:00:36,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:36,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:00:36,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:00:36,235 INFO L87 Difference]: Start difference. First operand 2032 states and 7326 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:36,572 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-07-13 20:00:37,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:37,852 INFO L93 Difference]: Finished difference Result 2452 states and 8624 transitions. [2021-07-13 20:00:37,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 20:00:37,853 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:37,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:37,859 INFO L225 Difference]: With dead ends: 2452 [2021-07-13 20:00:37,859 INFO L226 Difference]: Without dead ends: 2427 [2021-07-13 20:00:37,860 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1322.7ms TimeCoverageRelationStatistics Valid=285, Invalid=1437, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 20:00:37,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2427 states. [2021-07-13 20:00:37,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2427 to 2025. [2021-07-13 20:00:37,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2025 states, 2024 states have (on average 3.6096837944664033) internal successors, (7306), 2024 states have internal predecessors, (7306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:37,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2025 states to 2025 states and 7306 transitions. [2021-07-13 20:00:37,898 INFO L78 Accepts]: Start accepts. Automaton has 2025 states and 7306 transitions. Word has length 24 [2021-07-13 20:00:37,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:37,898 INFO L482 AbstractCegarLoop]: Abstraction has 2025 states and 7306 transitions. [2021-07-13 20:00:37,898 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:37,899 INFO L276 IsEmpty]: Start isEmpty. Operand 2025 states and 7306 transitions. [2021-07-13 20:00:37,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:37,903 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:37,903 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:38,118 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 243 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable473 [2021-07-13 20:00:38,119 INFO L430 AbstractCegarLoop]: === Iteration 255 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:38,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:38,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1854959050, now seen corresponding path program 89 times [2021-07-13 20:00:38,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:38,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822484592] [2021-07-13 20:00:38,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:38,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:38,413 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:38,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:38,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822484592] [2021-07-13 20:00:38,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822484592] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:38,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552112500] [2021-07-13 20:00:38,413 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 244 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 244 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:38,449 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:00:38,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:38,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:38,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:38,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:00:38,669 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:38,671 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:38,671 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:38,671 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:00:38,734 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:38,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [552112500] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:38,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:38,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:00:38,734 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321889474] [2021-07-13 20:00:38,734 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:00:38,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:38,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:00:38,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:00:38,735 INFO L87 Difference]: Start difference. First operand 2025 states and 7306 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:41,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:41,873 INFO L93 Difference]: Finished difference Result 2892 states and 9978 transitions. [2021-07-13 20:00:41,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-07-13 20:00:41,873 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:41,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:41,881 INFO L225 Difference]: With dead ends: 2892 [2021-07-13 20:00:41,881 INFO L226 Difference]: Without dead ends: 2832 [2021-07-13 20:00:41,881 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 991 ImplicationChecksByTransitivity, 2498.9ms TimeCoverageRelationStatistics Valid=585, Invalid=2955, Unknown=0, NotChecked=0, Total=3540 [2021-07-13 20:00:41,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2832 states. [2021-07-13 20:00:41,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2832 to 2045. [2021-07-13 20:00:41,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2045 states, 2044 states have (on average 3.606164383561644) internal successors, (7371), 2044 states have internal predecessors, (7371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:41,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2045 states to 2045 states and 7371 transitions. [2021-07-13 20:00:41,927 INFO L78 Accepts]: Start accepts. Automaton has 2045 states and 7371 transitions. Word has length 24 [2021-07-13 20:00:41,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:41,927 INFO L482 AbstractCegarLoop]: Abstraction has 2045 states and 7371 transitions. [2021-07-13 20:00:41,927 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:41,927 INFO L276 IsEmpty]: Start isEmpty. Operand 2045 states and 7371 transitions. [2021-07-13 20:00:41,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:41,931 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:41,931 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:42,148 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 244 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable474 [2021-07-13 20:00:42,149 INFO L430 AbstractCegarLoop]: === Iteration 256 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:42,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:42,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1238645496, now seen corresponding path program 90 times [2021-07-13 20:00:42,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:42,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004998646] [2021-07-13 20:00:42,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:42,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:42,400 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:42,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:42,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004998646] [2021-07-13 20:00:42,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004998646] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:42,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4869191] [2021-07-13 20:00:42,405 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 245 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 245 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:42,442 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:00:42,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:42,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:00:42,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:42,590 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:42,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:00:42,592 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:42,603 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:42,604 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:42,604 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:00:42,720 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:42,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4869191] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:42,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:42,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:00:42,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524232654] [2021-07-13 20:00:42,725 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:00:42,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:42,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:00:42,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:00:42,732 INFO L87 Difference]: Start difference. First operand 2045 states and 7371 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:45,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:45,888 INFO L93 Difference]: Finished difference Result 2693 states and 9333 transitions. [2021-07-13 20:00:45,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-07-13 20:00:45,895 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:45,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:45,904 INFO L225 Difference]: With dead ends: 2693 [2021-07-13 20:00:45,904 INFO L226 Difference]: Without dead ends: 2642 [2021-07-13 20:00:45,907 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1210 ImplicationChecksByTransitivity, 2697.3ms TimeCoverageRelationStatistics Valid=652, Invalid=3380, Unknown=0, NotChecked=0, Total=4032 [2021-07-13 20:00:45,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2642 states. [2021-07-13 20:00:45,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2642 to 2049. [2021-07-13 20:00:45,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2049 states, 2048 states have (on average 3.60546875) internal successors, (7384), 2048 states have internal predecessors, (7384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:45,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2049 states to 2049 states and 7384 transitions. [2021-07-13 20:00:45,950 INFO L78 Accepts]: Start accepts. Automaton has 2049 states and 7384 transitions. Word has length 24 [2021-07-13 20:00:45,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:45,950 INFO L482 AbstractCegarLoop]: Abstraction has 2049 states and 7384 transitions. [2021-07-13 20:00:45,950 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:45,951 INFO L276 IsEmpty]: Start isEmpty. Operand 2049 states and 7384 transitions. [2021-07-13 20:00:45,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:45,954 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:45,954 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:46,157 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 245 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable475 [2021-07-13 20:00:46,157 INFO L430 AbstractCegarLoop]: === Iteration 257 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:46,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:46,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1797839404, now seen corresponding path program 132 times [2021-07-13 20:00:46,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:46,158 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063735796] [2021-07-13 20:00:46,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:46,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:46,423 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:46,423 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:46,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063735796] [2021-07-13 20:00:46,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063735796] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:46,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468036816] [2021-07-13 20:00:46,423 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 246 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 246 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:46,459 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 20:00:46,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:46,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:00:46,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:46,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:00:46,701 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:00:46,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:00:46,702 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:46,707 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:46,708 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:46,708 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 20:00:46,742 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:46,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468036816] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:46,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:46,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:00:46,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611918187] [2021-07-13 20:00:46,743 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:00:46,743 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:46,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:00:46,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:00:46,743 INFO L87 Difference]: Start difference. First operand 2049 states and 7384 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:50,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:50,066 INFO L93 Difference]: Finished difference Result 2862 states and 9855 transitions. [2021-07-13 20:00:50,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-07-13 20:00:50,066 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:50,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:50,073 INFO L225 Difference]: With dead ends: 2862 [2021-07-13 20:00:50,073 INFO L226 Difference]: Without dead ends: 2804 [2021-07-13 20:00:50,074 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1298 ImplicationChecksByTransitivity, 2836.7ms TimeCoverageRelationStatistics Valid=732, Invalid=3690, Unknown=0, NotChecked=0, Total=4422 [2021-07-13 20:00:50,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2804 states. [2021-07-13 20:00:50,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2804 to 2057. [2021-07-13 20:00:50,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2057 states, 2056 states have (on average 3.6060311284046693) internal successors, (7414), 2056 states have internal predecessors, (7414), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:50,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2057 states to 2057 states and 7414 transitions. [2021-07-13 20:00:50,114 INFO L78 Accepts]: Start accepts. Automaton has 2057 states and 7414 transitions. Word has length 24 [2021-07-13 20:00:50,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:50,114 INFO L482 AbstractCegarLoop]: Abstraction has 2057 states and 7414 transitions. [2021-07-13 20:00:50,114 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:50,115 INFO L276 IsEmpty]: Start isEmpty. Operand 2057 states and 7414 transitions. [2021-07-13 20:00:50,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:50,118 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:50,118 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:50,334 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable477,246 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:50,335 INFO L430 AbstractCegarLoop]: === Iteration 258 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:50,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:50,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1468978032, now seen corresponding path program 133 times [2021-07-13 20:00:50,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:50,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878566768] [2021-07-13 20:00:50,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:50,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:50,581 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:50,581 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:50,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878566768] [2021-07-13 20:00:50,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878566768] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:50,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146953347] [2021-07-13 20:00:50,582 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 247 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 247 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:50,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:50,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:50,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:50,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:00:50,758 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:50,761 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:50,761 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:50,762 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:00:50,812 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:50,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146953347] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:50,812 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:50,813 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:00:50,813 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977402224] [2021-07-13 20:00:50,813 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:00:50,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:50,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:00:50,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:00:50,813 INFO L87 Difference]: Start difference. First operand 2057 states and 7414 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:53,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:53,678 INFO L93 Difference]: Finished difference Result 2726 states and 9487 transitions. [2021-07-13 20:00:53,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-07-13 20:00:53,678 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:53,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:53,687 INFO L225 Difference]: With dead ends: 2726 [2021-07-13 20:00:53,687 INFO L226 Difference]: Without dead ends: 2684 [2021-07-13 20:00:53,688 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 941 ImplicationChecksByTransitivity, 2193.8ms TimeCoverageRelationStatistics Valid=592, Invalid=2600, Unknown=0, NotChecked=0, Total=3192 [2021-07-13 20:00:53,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2684 states. [2021-07-13 20:00:53,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2684 to 2061. [2021-07-13 20:00:53,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2061 states, 2060 states have (on average 3.6048543689320387) internal successors, (7426), 2060 states have internal predecessors, (7426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:53,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2061 states to 2061 states and 7426 transitions. [2021-07-13 20:00:53,732 INFO L78 Accepts]: Start accepts. Automaton has 2061 states and 7426 transitions. Word has length 24 [2021-07-13 20:00:53,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:53,733 INFO L482 AbstractCegarLoop]: Abstraction has 2061 states and 7426 transitions. [2021-07-13 20:00:53,733 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:53,733 INFO L276 IsEmpty]: Start isEmpty. Operand 2061 states and 7426 transitions. [2021-07-13 20:00:53,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:53,736 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:53,736 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:53,936 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 247 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable478 [2021-07-13 20:00:53,937 INFO L430 AbstractCegarLoop]: === Iteration 259 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:53,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:53,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1792564210, now seen corresponding path program 134 times [2021-07-13 20:00:53,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:53,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [960109335] [2021-07-13 20:00:53,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:53,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:54,207 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:54,207 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:54,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [960109335] [2021-07-13 20:00:54,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [960109335] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:54,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263406254] [2021-07-13 20:00:54,207 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 248 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 248 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:54,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:00:54,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:54,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:00:54,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:54,518 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2021-07-13 20:00:54,580 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:54,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:00:54,582 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:54,594 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:54,595 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:54,596 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:00:54,730 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:54,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263406254] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:54,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:54,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:00:54,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939247742] [2021-07-13 20:00:54,730 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:00:54,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:54,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:00:54,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:00:54,731 INFO L87 Difference]: Start difference. First operand 2061 states and 7426 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:56,164 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 48 [2021-07-13 20:00:56,296 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-07-13 20:00:56,610 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 29 [2021-07-13 20:00:57,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:00:57,942 INFO L93 Difference]: Finished difference Result 2706 states and 9360 transitions. [2021-07-13 20:00:57,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-07-13 20:00:57,942 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:00:57,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:00:57,949 INFO L225 Difference]: With dead ends: 2706 [2021-07-13 20:00:57,949 INFO L226 Difference]: Without dead ends: 2666 [2021-07-13 20:00:57,950 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1192 ImplicationChecksByTransitivity, 2948.6ms TimeCoverageRelationStatistics Valid=645, Invalid=3261, Unknown=0, NotChecked=0, Total=3906 [2021-07-13 20:00:57,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2666 states. [2021-07-13 20:00:58,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2666 to 2069. [2021-07-13 20:00:58,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2069 states, 2068 states have (on average 3.604448742746615) internal successors, (7454), 2068 states have internal predecessors, (7454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:58,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2069 states to 2069 states and 7454 transitions. [2021-07-13 20:00:58,016 INFO L78 Accepts]: Start accepts. Automaton has 2069 states and 7454 transitions. Word has length 24 [2021-07-13 20:00:58,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:00:58,017 INFO L482 AbstractCegarLoop]: Abstraction has 2069 states and 7454 transitions. [2021-07-13 20:00:58,017 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:00:58,017 INFO L276 IsEmpty]: Start isEmpty. Operand 2069 states and 7454 transitions. [2021-07-13 20:00:58,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:00:58,021 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:00:58,021 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:00:58,222 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable479,248 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:58,222 INFO L430 AbstractCegarLoop]: === Iteration 260 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:00:58,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:00:58,222 INFO L82 PathProgramCache]: Analyzing trace with hash -816658964, now seen corresponding path program 135 times [2021-07-13 20:00:58,223 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:00:58,223 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781771459] [2021-07-13 20:00:58,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:00:58,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:00:58,553 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:58,553 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:00:58,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781771459] [2021-07-13 20:00:58,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781771459] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:58,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326768191] [2021-07-13 20:00:58,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 249 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 249 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:00:58,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 20:00:58,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:00:58,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:00:58,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:00:58,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:00:58,851 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:00:58,855 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:00:58,855 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:00:58,855 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:00:58,905 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:00:58,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326768191] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:00:58,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:00:58,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:00:58,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007519337] [2021-07-13 20:00:58,906 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:00:58,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:00:58,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:00:58,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:00:58,906 INFO L87 Difference]: Start difference. First operand 2069 states and 7454 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:00,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:00,896 INFO L93 Difference]: Finished difference Result 2577 states and 9029 transitions. [2021-07-13 20:01:00,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 20:01:00,897 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:00,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:00,903 INFO L225 Difference]: With dead ends: 2577 [2021-07-13 20:01:00,903 INFO L226 Difference]: Without dead ends: 2556 [2021-07-13 20:01:00,903 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 731 ImplicationChecksByTransitivity, 1878.2ms TimeCoverageRelationStatistics Valid=449, Invalid=2101, Unknown=0, NotChecked=0, Total=2550 [2021-07-13 20:01:00,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2556 states. [2021-07-13 20:01:00,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2556 to 2053. [2021-07-13 20:01:00,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2053 states, 2052 states have (on average 3.6062378167641325) internal successors, (7400), 2052 states have internal predecessors, (7400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:00,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2053 states to 2053 states and 7400 transitions. [2021-07-13 20:01:00,940 INFO L78 Accepts]: Start accepts. Automaton has 2053 states and 7400 transitions. Word has length 24 [2021-07-13 20:01:00,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:00,940 INFO L482 AbstractCegarLoop]: Abstraction has 2053 states and 7400 transitions. [2021-07-13 20:01:00,940 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:00,941 INFO L276 IsEmpty]: Start isEmpty. Operand 2053 states and 7400 transitions. [2021-07-13 20:01:00,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:00,944 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:00,944 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:01,158 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable482,249 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:01,158 INFO L430 AbstractCegarLoop]: === Iteration 261 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:01,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:01,159 INFO L82 PathProgramCache]: Analyzing trace with hash -357681178, now seen corresponding path program 91 times [2021-07-13 20:01:01,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:01,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641110368] [2021-07-13 20:01:01,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:01,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:01,389 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:01,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:01,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641110368] [2021-07-13 20:01:01,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641110368] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:01,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167436454] [2021-07-13 20:01:01,389 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 250 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 250 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:01,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:01,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:01,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:01,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:01:01,570 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:01,574 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:01,574 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:01,574 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:01:01,628 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:01,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167436454] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:01,628 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:01,628 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:01:01,628 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439744539] [2021-07-13 20:01:01,628 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:01:01,628 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:01,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:01:01,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:01:01,631 INFO L87 Difference]: Start difference. First operand 2053 states and 7400 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:03,600 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 29 [2021-07-13 20:01:05,180 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2021-07-13 20:01:05,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:05,428 INFO L93 Difference]: Finished difference Result 3882 states and 12995 transitions. [2021-07-13 20:01:05,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-07-13 20:01:05,429 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:05,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:05,438 INFO L225 Difference]: With dead ends: 3882 [2021-07-13 20:01:05,438 INFO L226 Difference]: Without dead ends: 3817 [2021-07-13 20:01:05,439 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2159 ImplicationChecksByTransitivity, 3301.8ms TimeCoverageRelationStatistics Valid=1169, Invalid=4993, Unknown=0, NotChecked=0, Total=6162 [2021-07-13 20:01:05,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3817 states. [2021-07-13 20:01:05,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3817 to 2126. [2021-07-13 20:01:05,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2126 states, 2125 states have (on average 3.6291764705882352) internal successors, (7712), 2125 states have internal predecessors, (7712), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:05,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2126 states to 2126 states and 7712 transitions. [2021-07-13 20:01:05,497 INFO L78 Accepts]: Start accepts. Automaton has 2126 states and 7712 transitions. Word has length 24 [2021-07-13 20:01:05,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:05,497 INFO L482 AbstractCegarLoop]: Abstraction has 2126 states and 7712 transitions. [2021-07-13 20:01:05,497 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:05,497 INFO L276 IsEmpty]: Start isEmpty. Operand 2126 states and 7712 transitions. [2021-07-13 20:01:05,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:05,502 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:05,502 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:05,725 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable483,250 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:05,725 INFO L430 AbstractCegarLoop]: === Iteration 262 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:05,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:05,726 INFO L82 PathProgramCache]: Analyzing trace with hash 1879791260, now seen corresponding path program 136 times [2021-07-13 20:01:05,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:05,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126913018] [2021-07-13 20:01:05,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:05,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:05,939 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:05,940 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:05,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126913018] [2021-07-13 20:01:05,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126913018] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:05,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066966072] [2021-07-13 20:01:05,940 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 251 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 251 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:05,982 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:01:05,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:05,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:05,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:06,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:01:06,118 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:06,121 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:06,122 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:06,122 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:01:06,178 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:06,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066966072] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:06,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:06,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:01:06,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919877275] [2021-07-13 20:01:06,178 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:01:06,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:06,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:01:06,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:01:06,179 INFO L87 Difference]: Start difference. First operand 2126 states and 7712 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:06,776 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 31 [2021-07-13 20:01:09,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:09,638 INFO L93 Difference]: Finished difference Result 3896 states and 13187 transitions. [2021-07-13 20:01:09,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-07-13 20:01:09,639 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:09,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:09,646 INFO L225 Difference]: With dead ends: 3896 [2021-07-13 20:01:09,646 INFO L226 Difference]: Without dead ends: 3835 [2021-07-13 20:01:09,647 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2130 ImplicationChecksByTransitivity, 2892.7ms TimeCoverageRelationStatistics Valid=1154, Invalid=5008, Unknown=0, NotChecked=0, Total=6162 [2021-07-13 20:01:09,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3835 states. [2021-07-13 20:01:09,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3835 to 2196. [2021-07-13 20:01:09,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2196 states, 2195 states have (on average 3.655125284738041) internal successors, (8023), 2195 states have internal predecessors, (8023), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:09,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2196 states to 2196 states and 8023 transitions. [2021-07-13 20:01:09,690 INFO L78 Accepts]: Start accepts. Automaton has 2196 states and 8023 transitions. Word has length 24 [2021-07-13 20:01:09,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:09,690 INFO L482 AbstractCegarLoop]: Abstraction has 2196 states and 8023 transitions. [2021-07-13 20:01:09,690 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:09,691 INFO L276 IsEmpty]: Start isEmpty. Operand 2196 states and 8023 transitions. [2021-07-13 20:01:09,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:09,694 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:09,694 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:09,894 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable484,251 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:09,894 INFO L430 AbstractCegarLoop]: === Iteration 263 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:09,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:09,895 INFO L82 PathProgramCache]: Analyzing trace with hash -2091589858, now seen corresponding path program 137 times [2021-07-13 20:01:09,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:09,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779338100] [2021-07-13 20:01:09,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:09,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:10,163 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:10,163 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:10,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779338100] [2021-07-13 20:01:10,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779338100] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:10,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338350811] [2021-07-13 20:01:10,163 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 252 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 252 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:10,200 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:01:10,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:10,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:10,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:10,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:01:10,337 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:10,340 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:10,340 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:10,341 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:01:10,396 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:10,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338350811] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:10,397 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:10,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:01:10,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43130518] [2021-07-13 20:01:10,397 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:01:10,397 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:10,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:01:10,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:01:10,398 INFO L87 Difference]: Start difference. First operand 2196 states and 8023 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:13,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:13,512 INFO L93 Difference]: Finished difference Result 3701 states and 12762 transitions. [2021-07-13 20:01:13,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-07-13 20:01:13,513 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:13,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:13,521 INFO L225 Difference]: With dead ends: 3701 [2021-07-13 20:01:13,521 INFO L226 Difference]: Without dead ends: 3658 [2021-07-13 20:01:13,522 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1820 ImplicationChecksByTransitivity, 2566.0ms TimeCoverageRelationStatistics Valid=974, Invalid=4428, Unknown=0, NotChecked=0, Total=5402 [2021-07-13 20:01:13,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3658 states. [2021-07-13 20:01:13,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3658 to 2202. [2021-07-13 20:01:13,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2202 states, 2201 states have (on average 3.659700136301681) internal successors, (8055), 2201 states have internal predecessors, (8055), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:13,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2202 states to 2202 states and 8055 transitions. [2021-07-13 20:01:13,577 INFO L78 Accepts]: Start accepts. Automaton has 2202 states and 8055 transitions. Word has length 24 [2021-07-13 20:01:13,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:13,577 INFO L482 AbstractCegarLoop]: Abstraction has 2202 states and 8055 transitions. [2021-07-13 20:01:13,577 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:13,577 INFO L276 IsEmpty]: Start isEmpty. Operand 2202 states and 8055 transitions. [2021-07-13 20:01:13,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:13,581 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:13,581 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:13,804 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 252 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable485 [2021-07-13 20:01:13,805 INFO L430 AbstractCegarLoop]: === Iteration 264 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:13,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:13,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1554667190, now seen corresponding path program 92 times [2021-07-13 20:01:13,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:13,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187463130] [2021-07-13 20:01:13,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:13,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:14,158 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:14,158 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:14,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187463130] [2021-07-13 20:01:14,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187463130] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:14,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562669725] [2021-07-13 20:01:14,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 253 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 253 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:14,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:01:14,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:14,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:14,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:14,339 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:14,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:01:14,340 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:14,349 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:14,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:14,350 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:01:14,422 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:14,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562669725] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:14,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:14,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:01:14,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512737240] [2021-07-13 20:01:14,422 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:01:14,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:14,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:01:14,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:01:14,423 INFO L87 Difference]: Start difference. First operand 2202 states and 8055 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:17,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:17,385 INFO L93 Difference]: Finished difference Result 3738 states and 12902 transitions. [2021-07-13 20:01:17,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-07-13 20:01:17,385 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:17,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:17,393 INFO L225 Difference]: With dead ends: 3738 [2021-07-13 20:01:17,393 INFO L226 Difference]: Without dead ends: 3704 [2021-07-13 20:01:17,394 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1818 ImplicationChecksByTransitivity, 2646.5ms TimeCoverageRelationStatistics Valid=931, Invalid=4619, Unknown=0, NotChecked=0, Total=5550 [2021-07-13 20:01:17,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3704 states. [2021-07-13 20:01:17,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3704 to 2243. [2021-07-13 20:01:17,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2243 states, 2242 states have (on average 3.68064228367529) internal successors, (8252), 2242 states have internal predecessors, (8252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:17,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2243 states to 2243 states and 8252 transitions. [2021-07-13 20:01:17,438 INFO L78 Accepts]: Start accepts. Automaton has 2243 states and 8252 transitions. Word has length 24 [2021-07-13 20:01:17,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:17,438 INFO L482 AbstractCegarLoop]: Abstraction has 2243 states and 8252 transitions. [2021-07-13 20:01:17,439 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:17,439 INFO L276 IsEmpty]: Start isEmpty. Operand 2243 states and 8252 transitions. [2021-07-13 20:01:17,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:17,442 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:17,442 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:17,642 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 253 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable486 [2021-07-13 20:01:17,642 INFO L430 AbstractCegarLoop]: === Iteration 265 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:17,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:17,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1759585324, now seen corresponding path program 138 times [2021-07-13 20:01:17,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:17,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561170241] [2021-07-13 20:01:17,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:17,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:17,846 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:17,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:17,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561170241] [2021-07-13 20:01:17,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1561170241] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:17,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123796244] [2021-07-13 20:01:17,846 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 254 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 254 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:17,878 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:01:17,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:17,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:17,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:18,029 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:18,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:01:18,031 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:18,040 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:18,041 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:18,041 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:27 [2021-07-13 20:01:18,117 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:18,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123796244] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:18,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:18,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:01:18,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805746945] [2021-07-13 20:01:18,117 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:01:18,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:18,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:01:18,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:01:18,118 INFO L87 Difference]: Start difference. First operand 2243 states and 8252 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:21,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:21,564 INFO L93 Difference]: Finished difference Result 3686 states and 12714 transitions. [2021-07-13 20:01:21,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-07-13 20:01:21,564 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:21,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:21,586 INFO L225 Difference]: With dead ends: 3686 [2021-07-13 20:01:21,586 INFO L226 Difference]: Without dead ends: 3656 [2021-07-13 20:01:21,586 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2073 ImplicationChecksByTransitivity, 2897.3ms TimeCoverageRelationStatistics Valid=1095, Invalid=5067, Unknown=0, NotChecked=0, Total=6162 [2021-07-13 20:01:21,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3656 states. [2021-07-13 20:01:21,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3656 to 2245. [2021-07-13 20:01:21,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2245 states, 2244 states have (on average 3.679590017825312) internal successors, (8257), 2244 states have internal predecessors, (8257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:21,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2245 states to 2245 states and 8257 transitions. [2021-07-13 20:01:21,623 INFO L78 Accepts]: Start accepts. Automaton has 2245 states and 8257 transitions. Word has length 24 [2021-07-13 20:01:21,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:21,623 INFO L482 AbstractCegarLoop]: Abstraction has 2245 states and 8257 transitions. [2021-07-13 20:01:21,623 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:21,624 INFO L276 IsEmpty]: Start isEmpty. Operand 2245 states and 8257 transitions. [2021-07-13 20:01:21,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:21,626 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:21,626 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:21,827 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable488,254 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:21,827 INFO L430 AbstractCegarLoop]: === Iteration 266 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:21,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:21,828 INFO L82 PathProgramCache]: Analyzing trace with hash -73841202, now seen corresponding path program 139 times [2021-07-13 20:01:21,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:21,828 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208936996] [2021-07-13 20:01:21,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:21,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:22,021 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:22,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:22,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208936996] [2021-07-13 20:01:22,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208936996] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:22,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253603310] [2021-07-13 20:01:22,021 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 255 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 255 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:22,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:22,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:22,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:22,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:01:22,180 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:22,182 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:22,182 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:22,182 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:01:22,213 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:22,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253603310] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:22,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:22,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:01:22,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490615246] [2021-07-13 20:01:22,213 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:01:22,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:22,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:01:22,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:01:22,214 INFO L87 Difference]: Start difference. First operand 2245 states and 8257 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:24,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:24,613 INFO L93 Difference]: Finished difference Result 3537 states and 12238 transitions. [2021-07-13 20:01:24,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-07-13 20:01:24,614 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:24,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:24,621 INFO L225 Difference]: With dead ends: 3537 [2021-07-13 20:01:24,621 INFO L226 Difference]: Without dead ends: 3502 [2021-07-13 20:01:24,622 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1335 ImplicationChecksByTransitivity, 1932.9ms TimeCoverageRelationStatistics Valid=777, Invalid=3383, Unknown=0, NotChecked=0, Total=4160 [2021-07-13 20:01:24,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3502 states. [2021-07-13 20:01:24,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3502 to 2223. [2021-07-13 20:01:24,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2223 states, 2222 states have (on average 3.6665166516651664) internal successors, (8147), 2222 states have internal predecessors, (8147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:24,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2223 states to 2223 states and 8147 transitions. [2021-07-13 20:01:24,663 INFO L78 Accepts]: Start accepts. Automaton has 2223 states and 8147 transitions. Word has length 24 [2021-07-13 20:01:24,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:24,663 INFO L482 AbstractCegarLoop]: Abstraction has 2223 states and 8147 transitions. [2021-07-13 20:01:24,663 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:24,663 INFO L276 IsEmpty]: Start isEmpty. Operand 2223 states and 8147 transitions. [2021-07-13 20:01:24,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:24,666 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:24,666 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:24,866 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable491,255 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:24,867 INFO L430 AbstractCegarLoop]: === Iteration 267 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:24,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:24,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1816560186, now seen corresponding path program 140 times [2021-07-13 20:01:24,867 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:24,867 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608608182] [2021-07-13 20:01:24,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:24,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:25,091 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:25,092 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:25,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608608182] [2021-07-13 20:01:25,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608608182] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:25,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314439201] [2021-07-13 20:01:25,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 256 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 256 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:25,123 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:01:25,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:25,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:25,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:25,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:01:25,371 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:01:25,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:01:25,372 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:25,376 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:25,377 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:25,377 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 20:01:25,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:25,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314439201] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:25,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:25,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:01:25,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636422016] [2021-07-13 20:01:25,410 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:01:25,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:25,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:01:25,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:01:25,411 INFO L87 Difference]: Start difference. First operand 2223 states and 8147 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:25,716 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 46 [2021-07-13 20:01:26,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:26,791 INFO L93 Difference]: Finished difference Result 2779 states and 9798 transitions. [2021-07-13 20:01:26,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-13 20:01:26,791 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:26,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:26,796 INFO L225 Difference]: With dead ends: 2779 [2021-07-13 20:01:26,796 INFO L226 Difference]: Without dead ends: 2729 [2021-07-13 20:01:26,797 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1192.4ms TimeCoverageRelationStatistics Valid=288, Invalid=1692, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 20:01:26,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2729 states. [2021-07-13 20:01:26,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2729 to 2227. [2021-07-13 20:01:26,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2227 states, 2226 states have (on average 3.665768194070081) internal successors, (8160), 2226 states have internal predecessors, (8160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:26,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2227 states to 2227 states and 8160 transitions. [2021-07-13 20:01:26,831 INFO L78 Accepts]: Start accepts. Automaton has 2227 states and 8160 transitions. Word has length 24 [2021-07-13 20:01:26,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:26,831 INFO L482 AbstractCegarLoop]: Abstraction has 2227 states and 8160 transitions. [2021-07-13 20:01:26,831 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:26,831 INFO L276 IsEmpty]: Start isEmpty. Operand 2227 states and 8160 transitions. [2021-07-13 20:01:26,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:26,834 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:26,834 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:27,034 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable492,256 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:27,035 INFO L430 AbstractCegarLoop]: === Iteration 268 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:27,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:27,035 INFO L82 PathProgramCache]: Analyzing trace with hash -749735364, now seen corresponding path program 141 times [2021-07-13 20:01:27,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:27,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720342395] [2021-07-13 20:01:27,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:27,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:27,303 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:27,303 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:27,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720342395] [2021-07-13 20:01:27,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720342395] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:27,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7867355] [2021-07-13 20:01:27,304 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 257 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 257 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:27,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 20:01:27,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:27,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:27,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:27,516 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:27,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:01:27,517 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:27,526 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:27,527 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:27,527 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:01:27,594 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:27,594 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7867355] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:27,594 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:27,594 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:01:27,594 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410384812] [2021-07-13 20:01:27,594 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:01:27,595 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:27,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:01:27,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:01:27,595 INFO L87 Difference]: Start difference. First operand 2227 states and 8160 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:27,917 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 51 [2021-07-13 20:01:29,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:29,694 INFO L93 Difference]: Finished difference Result 2773 states and 9806 transitions. [2021-07-13 20:01:29,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-07-13 20:01:29,694 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:29,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:29,701 INFO L225 Difference]: With dead ends: 2773 [2021-07-13 20:01:29,701 INFO L226 Difference]: Without dead ends: 2737 [2021-07-13 20:01:29,701 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 1776.6ms TimeCoverageRelationStatistics Valid=441, Invalid=2421, Unknown=0, NotChecked=0, Total=2862 [2021-07-13 20:01:29,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2737 states. [2021-07-13 20:01:29,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2737 to 2230. [2021-07-13 20:01:29,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2230 states, 2229 states have (on average 3.665320771646478) internal successors, (8170), 2229 states have internal predecessors, (8170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:29,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2230 states to 2230 states and 8170 transitions. [2021-07-13 20:01:29,743 INFO L78 Accepts]: Start accepts. Automaton has 2230 states and 8170 transitions. Word has length 24 [2021-07-13 20:01:29,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:29,743 INFO L482 AbstractCegarLoop]: Abstraction has 2230 states and 8170 transitions. [2021-07-13 20:01:29,744 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:29,744 INFO L276 IsEmpty]: Start isEmpty. Operand 2230 states and 8170 transitions. [2021-07-13 20:01:29,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:29,747 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:29,747 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:29,952 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable493,257 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:29,953 INFO L430 AbstractCegarLoop]: === Iteration 269 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:29,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:29,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1777885224, now seen corresponding path program 142 times [2021-07-13 20:01:29,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:29,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249012519] [2021-07-13 20:01:29,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:29,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:30,138 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:30,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:30,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249012519] [2021-07-13 20:01:30,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249012519] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:30,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260867627] [2021-07-13 20:01:30,138 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 258 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 258 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:30,167 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:01:30,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:30,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:30,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:30,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:01:30,297 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:30,300 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:30,300 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:30,301 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:01:30,347 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:30,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260867627] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:30,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:30,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:01:30,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201946432] [2021-07-13 20:01:30,348 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:01:30,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:30,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:01:30,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:01:30,348 INFO L87 Difference]: Start difference. First operand 2230 states and 8170 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:31,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:31,449 INFO L93 Difference]: Finished difference Result 2693 states and 9594 transitions. [2021-07-13 20:01:31,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 20:01:31,450 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:31,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:31,455 INFO L225 Difference]: With dead ends: 2693 [2021-07-13 20:01:31,455 INFO L226 Difference]: Without dead ends: 2667 [2021-07-13 20:01:31,456 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 998.3ms TimeCoverageRelationStatistics Valid=286, Invalid=1354, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:01:31,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2667 states. [2021-07-13 20:01:31,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2667 to 2235. [2021-07-13 20:01:31,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2235 states, 2234 states have (on average 3.6638316920322294) internal successors, (8185), 2234 states have internal predecessors, (8185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:31,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2235 states to 2235 states and 8185 transitions. [2021-07-13 20:01:31,490 INFO L78 Accepts]: Start accepts. Automaton has 2235 states and 8185 transitions. Word has length 24 [2021-07-13 20:01:31,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:31,490 INFO L482 AbstractCegarLoop]: Abstraction has 2235 states and 8185 transitions. [2021-07-13 20:01:31,490 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:31,490 INFO L276 IsEmpty]: Start isEmpty. Operand 2235 states and 8185 transitions. [2021-07-13 20:01:31,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:31,493 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:31,493 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:31,696 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 258 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable496 [2021-07-13 20:01:31,697 INFO L430 AbstractCegarLoop]: === Iteration 270 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:31,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:31,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1454299046, now seen corresponding path program 143 times [2021-07-13 20:01:31,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:31,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531790434] [2021-07-13 20:01:31,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:31,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:31,880 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:31,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:31,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531790434] [2021-07-13 20:01:31,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531790434] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:31,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449674354] [2021-07-13 20:01:31,880 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 259 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 259 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:31,907 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:01:31,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:31,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:31,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:32,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:01:32,040 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:32,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:32,043 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:32,043 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:01:32,092 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:32,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449674354] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:32,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:32,093 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:01:32,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565635252] [2021-07-13 20:01:32,093 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:01:32,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:32,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:01:32,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:01:32,093 INFO L87 Difference]: Start difference. First operand 2235 states and 8185 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:33,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:33,234 INFO L93 Difference]: Finished difference Result 2644 states and 9457 transitions. [2021-07-13 20:01:33,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 20:01:33,235 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:33,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:33,241 INFO L225 Difference]: With dead ends: 2644 [2021-07-13 20:01:33,241 INFO L226 Difference]: Without dead ends: 2619 [2021-07-13 20:01:33,241 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 985.9ms TimeCoverageRelationStatistics Valid=271, Invalid=1369, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:01:33,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2619 states. [2021-07-13 20:01:33,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2619 to 2228. [2021-07-13 20:01:33,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2228 states, 2227 states have (on average 3.666367310282892) internal successors, (8165), 2227 states have internal predecessors, (8165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:33,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2228 states to 2228 states and 8165 transitions. [2021-07-13 20:01:33,284 INFO L78 Accepts]: Start accepts. Automaton has 2228 states and 8165 transitions. Word has length 24 [2021-07-13 20:01:33,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:33,284 INFO L482 AbstractCegarLoop]: Abstraction has 2228 states and 8165 transitions. [2021-07-13 20:01:33,284 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:33,284 INFO L276 IsEmpty]: Start isEmpty. Operand 2228 states and 8165 transitions. [2021-07-13 20:01:33,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:33,288 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:33,288 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:33,510 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 259 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable497 [2021-07-13 20:01:33,510 INFO L430 AbstractCegarLoop]: === Iteration 271 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:33,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:33,511 INFO L82 PathProgramCache]: Analyzing trace with hash -455428470, now seen corresponding path program 144 times [2021-07-13 20:01:33,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:33,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956468401] [2021-07-13 20:01:33,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:33,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:33,793 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:33,793 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:33,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956468401] [2021-07-13 20:01:33,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [956468401] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:33,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108864939] [2021-07-13 20:01:33,794 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 260 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 260 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:33,825 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 20:01:33,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:33,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:33,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:34,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:01:34,085 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:01:34,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:01:34,086 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:34,090 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:34,091 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:34,091 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 20:01:34,128 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:34,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108864939] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:34,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:34,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:01:34,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297397196] [2021-07-13 20:01:34,128 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:01:34,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:34,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:01:34,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:01:34,129 INFO L87 Difference]: Start difference. First operand 2228 states and 8165 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:34,433 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 44 [2021-07-13 20:01:35,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:35,352 INFO L93 Difference]: Finished difference Result 2746 states and 9710 transitions. [2021-07-13 20:01:35,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:01:35,353 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:35,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:35,357 INFO L225 Difference]: With dead ends: 2746 [2021-07-13 20:01:35,357 INFO L226 Difference]: Without dead ends: 2704 [2021-07-13 20:01:35,358 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 1126.9ms TimeCoverageRelationStatistics Valid=254, Invalid=1552, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:01:35,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2704 states. [2021-07-13 20:01:35,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2704 to 2230. [2021-07-13 20:01:35,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2230 states, 2229 states have (on average 3.6657694033198744) internal successors, (8171), 2229 states have internal predecessors, (8171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:35,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2230 states to 2230 states and 8171 transitions. [2021-07-13 20:01:35,389 INFO L78 Accepts]: Start accepts. Automaton has 2230 states and 8171 transitions. Word has length 24 [2021-07-13 20:01:35,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:35,389 INFO L482 AbstractCegarLoop]: Abstraction has 2230 states and 8171 transitions. [2021-07-13 20:01:35,389 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:35,389 INFO L276 IsEmpty]: Start isEmpty. Operand 2230 states and 8171 transitions. [2021-07-13 20:01:35,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:35,392 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:35,393 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:35,593 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 260 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable498 [2021-07-13 20:01:35,593 INFO L430 AbstractCegarLoop]: === Iteration 272 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:35,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:35,594 INFO L82 PathProgramCache]: Analyzing trace with hash 808869012, now seen corresponding path program 145 times [2021-07-13 20:01:35,594 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:35,594 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161332376] [2021-07-13 20:01:35,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:35,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:35,889 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:35,889 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:35,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161332376] [2021-07-13 20:01:35,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161332376] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:35,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434118526] [2021-07-13 20:01:35,889 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 261 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 261 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:35,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:35,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:35,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:36,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:01:36,092 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:36,093 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:36,094 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:36,094 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:01:36,126 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:36,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434118526] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:36,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:36,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:01:36,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759337014] [2021-07-13 20:01:36,127 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:01:36,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:36,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:01:36,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:01:36,127 INFO L87 Difference]: Start difference. First operand 2230 states and 8171 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:36,408 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 44 [2021-07-13 20:01:37,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:37,352 INFO L93 Difference]: Finished difference Result 2749 states and 9747 transitions. [2021-07-13 20:01:37,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:01:37,353 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:37,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:37,358 INFO L225 Difference]: With dead ends: 2749 [2021-07-13 20:01:37,358 INFO L226 Difference]: Without dead ends: 2723 [2021-07-13 20:01:37,358 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 1129.2ms TimeCoverageRelationStatistics Valid=275, Invalid=1531, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:01:37,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2723 states. [2021-07-13 20:01:37,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2723 to 2232. [2021-07-13 20:01:37,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2232 states, 2231 states have (on average 3.665172568354998) internal successors, (8177), 2231 states have internal predecessors, (8177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:37,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2232 states to 2232 states and 8177 transitions. [2021-07-13 20:01:37,392 INFO L78 Accepts]: Start accepts. Automaton has 2232 states and 8177 transitions. Word has length 24 [2021-07-13 20:01:37,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:37,392 INFO L482 AbstractCegarLoop]: Abstraction has 2232 states and 8177 transitions. [2021-07-13 20:01:37,392 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:37,392 INFO L276 IsEmpty]: Start isEmpty. Operand 2232 states and 8177 transitions. [2021-07-13 20:01:37,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:37,395 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:37,395 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:37,595 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 261 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable499 [2021-07-13 20:01:37,596 INFO L430 AbstractCegarLoop]: === Iteration 273 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:37,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:37,596 INFO L82 PathProgramCache]: Analyzing trace with hash 632327580, now seen corresponding path program 146 times [2021-07-13 20:01:37,596 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:37,596 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912898760] [2021-07-13 20:01:37,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:37,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:37,805 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:37,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:37,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912898760] [2021-07-13 20:01:37,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912898760] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:37,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677460376] [2021-07-13 20:01:37,806 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 262 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 262 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:37,834 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:01:37,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:37,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:37,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:38,002 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:38,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:01:38,004 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:38,014 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:38,015 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:38,015 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:01:38,115 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:38,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677460376] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:38,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:38,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:01:38,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182372261] [2021-07-13 20:01:38,115 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:01:38,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:38,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:01:38,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=417, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:01:38,116 INFO L87 Difference]: Start difference. First operand 2232 states and 8177 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:38,419 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 52 [2021-07-13 20:01:40,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:40,226 INFO L93 Difference]: Finished difference Result 2814 states and 9921 transitions. [2021-07-13 20:01:40,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 20:01:40,227 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:40,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:40,234 INFO L225 Difference]: With dead ends: 2814 [2021-07-13 20:01:40,235 INFO L226 Difference]: Without dead ends: 2778 [2021-07-13 20:01:40,235 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 856 ImplicationChecksByTransitivity, 1822.2ms TimeCoverageRelationStatistics Valid=503, Invalid=2577, Unknown=0, NotChecked=0, Total=3080 [2021-07-13 20:01:40,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2778 states. [2021-07-13 20:01:40,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2778 to 2233. [2021-07-13 20:01:40,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2233 states, 2232 states have (on average 3.6657706093189963) internal successors, (8182), 2232 states have internal predecessors, (8182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:40,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2233 states to 2233 states and 8182 transitions. [2021-07-13 20:01:40,286 INFO L78 Accepts]: Start accepts. Automaton has 2233 states and 8182 transitions. Word has length 24 [2021-07-13 20:01:40,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:40,286 INFO L482 AbstractCegarLoop]: Abstraction has 2233 states and 8182 transitions. [2021-07-13 20:01:40,287 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:40,287 INFO L276 IsEmpty]: Start isEmpty. Operand 2233 states and 8182 transitions. [2021-07-13 20:01:40,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:40,291 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:40,291 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:40,532 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable500,262 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:40,533 INFO L430 AbstractCegarLoop]: === Iteration 274 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:40,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:40,533 INFO L82 PathProgramCache]: Analyzing trace with hash -201410860, now seen corresponding path program 147 times [2021-07-13 20:01:40,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:40,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255766057] [2021-07-13 20:01:40,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:40,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:40,807 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:40,808 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:40,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255766057] [2021-07-13 20:01:40,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255766057] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:40,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990103126] [2021-07-13 20:01:40,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 263 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 263 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:40,845 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-13 20:01:40,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:40,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:40,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:41,022 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:41,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:01:41,024 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:41,035 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:41,036 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:41,036 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:01:41,181 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:41,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990103126] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:41,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:41,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:01:41,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173751269] [2021-07-13 20:01:41,182 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:01:41,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:41,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:01:41,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:01:41,183 INFO L87 Difference]: Start difference. First operand 2233 states and 8182 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:41,566 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 52 [2021-07-13 20:01:43,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:43,300 INFO L93 Difference]: Finished difference Result 2807 states and 9852 transitions. [2021-07-13 20:01:43,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-07-13 20:01:43,301 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:43,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:43,308 INFO L225 Difference]: With dead ends: 2807 [2021-07-13 20:01:43,308 INFO L226 Difference]: Without dead ends: 2779 [2021-07-13 20:01:43,308 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 1927.8ms TimeCoverageRelationStatistics Valid=358, Invalid=2092, Unknown=0, NotChecked=0, Total=2450 [2021-07-13 20:01:43,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2779 states. [2021-07-13 20:01:43,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2779 to 2234. [2021-07-13 20:01:43,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2234 states, 2233 states have (on average 3.667263770712047) internal successors, (8189), 2233 states have internal predecessors, (8189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:43,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2234 states to 2234 states and 8189 transitions. [2021-07-13 20:01:43,352 INFO L78 Accepts]: Start accepts. Automaton has 2234 states and 8189 transitions. Word has length 24 [2021-07-13 20:01:43,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:43,352 INFO L482 AbstractCegarLoop]: Abstraction has 2234 states and 8189 transitions. [2021-07-13 20:01:43,352 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:43,352 INFO L276 IsEmpty]: Start isEmpty. Operand 2234 states and 8189 transitions. [2021-07-13 20:01:43,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:43,357 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:43,357 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:43,576 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 263 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable503 [2021-07-13 20:01:43,576 INFO L430 AbstractCegarLoop]: === Iteration 275 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:43,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:43,577 INFO L82 PathProgramCache]: Analyzing trace with hash 580422940, now seen corresponding path program 148 times [2021-07-13 20:01:43,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:43,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97096235] [2021-07-13 20:01:43,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:43,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:43,765 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:43,765 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:43,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97096235] [2021-07-13 20:01:43,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97096235] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:43,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081816366] [2021-07-13 20:01:43,765 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 264 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 264 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:43,798 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:01:43,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:43,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:43,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:43,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:01:43,970 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:43,973 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:43,974 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:43,974 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:01:44,028 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:44,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081816366] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:44,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:44,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:01:44,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217404148] [2021-07-13 20:01:44,029 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:01:44,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:44,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:01:44,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:01:44,030 INFO L87 Difference]: Start difference. First operand 2234 states and 8189 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:44,364 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 44 [2021-07-13 20:01:45,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:45,287 INFO L93 Difference]: Finished difference Result 2654 states and 9469 transitions. [2021-07-13 20:01:45,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:01:45,287 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:45,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:45,293 INFO L225 Difference]: With dead ends: 2654 [2021-07-13 20:01:45,293 INFO L226 Difference]: Without dead ends: 2640 [2021-07-13 20:01:45,293 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 1069.4ms TimeCoverageRelationStatistics Valid=231, Invalid=1329, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 20:01:45,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2640 states. [2021-07-13 20:01:45,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2640 to 2233. [2021-07-13 20:01:45,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2233 states, 2232 states have (on average 3.668010752688172) internal successors, (8187), 2232 states have internal predecessors, (8187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:45,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2233 states to 2233 states and 8187 transitions. [2021-07-13 20:01:45,335 INFO L78 Accepts]: Start accepts. Automaton has 2233 states and 8187 transitions. Word has length 24 [2021-07-13 20:01:45,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:45,335 INFO L482 AbstractCegarLoop]: Abstraction has 2233 states and 8187 transitions. [2021-07-13 20:01:45,335 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:45,335 INFO L276 IsEmpty]: Start isEmpty. Operand 2233 states and 8187 transitions. [2021-07-13 20:01:45,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:45,339 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:45,339 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:45,562 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 264 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable506 [2021-07-13 20:01:45,562 INFO L430 AbstractCegarLoop]: === Iteration 276 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:45,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:45,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1802814956, now seen corresponding path program 149 times [2021-07-13 20:01:45,563 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:45,563 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264266188] [2021-07-13 20:01:45,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:45,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:45,838 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:45,839 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:45,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264266188] [2021-07-13 20:01:45,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264266188] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:45,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336078816] [2021-07-13 20:01:45,839 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 265 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 265 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:45,876 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:01:45,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:45,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:45,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:46,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:01:46,079 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:46,081 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:46,081 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:46,081 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:01:46,116 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:46,116 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336078816] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:46,116 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:46,116 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:01:46,116 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48256033] [2021-07-13 20:01:46,116 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:01:46,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:46,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:01:46,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:01:46,117 INFO L87 Difference]: Start difference. First operand 2233 states and 8187 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:46,438 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 43 [2021-07-13 20:01:47,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:47,790 INFO L93 Difference]: Finished difference Result 2750 states and 9744 transitions. [2021-07-13 20:01:47,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:01:47,790 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:47,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:47,799 INFO L225 Difference]: With dead ends: 2750 [2021-07-13 20:01:47,799 INFO L226 Difference]: Without dead ends: 2714 [2021-07-13 20:01:47,800 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 1424.1ms TimeCoverageRelationStatistics Valid=290, Invalid=1602, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 20:01:47,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2714 states. [2021-07-13 20:01:47,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2714 to 2238. [2021-07-13 20:01:47,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2238 states, 2237 states have (on average 3.6678587393831026) internal successors, (8205), 2237 states have internal predecessors, (8205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:47,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2238 states to 2238 states and 8205 transitions. [2021-07-13 20:01:47,851 INFO L78 Accepts]: Start accepts. Automaton has 2238 states and 8205 transitions. Word has length 24 [2021-07-13 20:01:47,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:47,851 INFO L482 AbstractCegarLoop]: Abstraction has 2238 states and 8205 transitions. [2021-07-13 20:01:47,851 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:47,851 INFO L276 IsEmpty]: Start isEmpty. Operand 2238 states and 8205 transitions. [2021-07-13 20:01:47,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:47,856 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:47,856 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:48,072 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable507,265 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:48,073 INFO L430 AbstractCegarLoop]: === Iteration 277 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:48,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:48,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1464002480, now seen corresponding path program 150 times [2021-07-13 20:01:48,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:48,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20566854] [2021-07-13 20:01:48,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:48,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:48,338 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:48,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:48,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20566854] [2021-07-13 20:01:48,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20566854] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:48,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183785997] [2021-07-13 20:01:48,338 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 266 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 266 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:48,374 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 20:01:48,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:48,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:48,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:48,539 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:48,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:01:48,541 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:48,552 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:48,553 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:48,553 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:01:48,661 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:48,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183785997] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:48,662 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:48,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:01:48,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232476204] [2021-07-13 20:01:48,662 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:01:48,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:48,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:01:48,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:01:48,663 INFO L87 Difference]: Start difference. First operand 2238 states and 8205 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:48,989 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 47 [2021-07-13 20:01:50,187 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 33 [2021-07-13 20:01:50,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:50,542 INFO L93 Difference]: Finished difference Result 2707 states and 9616 transitions. [2021-07-13 20:01:50,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 20:01:50,543 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:50,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:50,550 INFO L225 Difference]: With dead ends: 2707 [2021-07-13 20:01:50,550 INFO L226 Difference]: Without dead ends: 2671 [2021-07-13 20:01:50,550 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 1764.9ms TimeCoverageRelationStatistics Valid=380, Invalid=1876, Unknown=0, NotChecked=0, Total=2256 [2021-07-13 20:01:50,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2671 states. [2021-07-13 20:01:50,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2671 to 2243. [2021-07-13 20:01:50,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2243 states, 2242 states have (on average 3.6663693131132917) internal successors, (8220), 2242 states have internal predecessors, (8220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:50,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2243 states to 2243 states and 8220 transitions. [2021-07-13 20:01:50,596 INFO L78 Accepts]: Start accepts. Automaton has 2243 states and 8220 transitions. Word has length 24 [2021-07-13 20:01:50,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:50,596 INFO L482 AbstractCegarLoop]: Abstraction has 2243 states and 8220 transitions. [2021-07-13 20:01:50,597 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:50,597 INFO L276 IsEmpty]: Start isEmpty. Operand 2243 states and 8220 transitions. [2021-07-13 20:01:50,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:50,601 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:50,601 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:50,824 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable508,266 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:50,825 INFO L430 AbstractCegarLoop]: === Iteration 278 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:50,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:50,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1787588658, now seen corresponding path program 151 times [2021-07-13 20:01:50,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:50,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51919095] [2021-07-13 20:01:50,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:50,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:51,067 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:51,067 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:51,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51919095] [2021-07-13 20:01:51,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51919095] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:51,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764004243] [2021-07-13 20:01:51,067 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 267 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 267 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:51,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:51,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:51,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:51,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:01:51,257 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:51,260 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:51,260 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:51,261 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:01:51,315 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:51,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764004243] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:51,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:51,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:01:51,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156096409] [2021-07-13 20:01:51,316 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:01:51,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:51,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:01:51,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:01:51,316 INFO L87 Difference]: Start difference. First operand 2243 states and 8220 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:51,620 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 37 [2021-07-13 20:01:52,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:52,651 INFO L93 Difference]: Finished difference Result 2641 states and 9458 transitions. [2021-07-13 20:01:52,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 20:01:52,651 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:52,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:52,658 INFO L225 Difference]: With dead ends: 2641 [2021-07-13 20:01:52,658 INFO L226 Difference]: Without dead ends: 2616 [2021-07-13 20:01:52,659 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 1122.2ms TimeCoverageRelationStatistics Valid=239, Invalid=1167, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 20:01:52,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2616 states. [2021-07-13 20:01:52,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2616 to 2236. [2021-07-13 20:01:52,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2236 states, 2235 states have (on average 3.668456375838926) internal successors, (8199), 2235 states have internal predecessors, (8199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:52,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2236 states to 2236 states and 8199 transitions. [2021-07-13 20:01:52,701 INFO L78 Accepts]: Start accepts. Automaton has 2236 states and 8199 transitions. Word has length 24 [2021-07-13 20:01:52,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:52,701 INFO L482 AbstractCegarLoop]: Abstraction has 2236 states and 8199 transitions. [2021-07-13 20:01:52,701 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:52,701 INFO L276 IsEmpty]: Start isEmpty. Operand 2236 states and 8199 transitions. [2021-07-13 20:01:52,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:52,706 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:52,706 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:52,924 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable511,267 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:52,925 INFO L430 AbstractCegarLoop]: === Iteration 279 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:52,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:52,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1183368252, now seen corresponding path program 152 times [2021-07-13 20:01:52,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:52,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626650859] [2021-07-13 20:01:52,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:52,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:53,246 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:53,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:53,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626650859] [2021-07-13 20:01:53,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626650859] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:53,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663428894] [2021-07-13 20:01:53,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 268 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 268 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:53,283 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:01:53,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:53,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:53,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:53,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:01:53,565 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:01:53,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:01:53,566 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:53,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:53,572 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:53,573 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 20:01:53,610 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:53,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663428894] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:53,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:53,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:01:53,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197933616] [2021-07-13 20:01:53,611 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:01:53,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:53,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:01:53,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:01:53,611 INFO L87 Difference]: Start difference. First operand 2236 states and 8199 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:54,033 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2021-07-13 20:01:55,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:55,235 INFO L93 Difference]: Finished difference Result 2732 states and 9669 transitions. [2021-07-13 20:01:55,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:01:55,235 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:55,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:55,241 INFO L225 Difference]: With dead ends: 2732 [2021-07-13 20:01:55,241 INFO L226 Difference]: Without dead ends: 2680 [2021-07-13 20:01:55,241 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1339.0ms TimeCoverageRelationStatistics Valid=258, Invalid=1548, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:01:55,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2680 states. [2021-07-13 20:01:55,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2680 to 2238. [2021-07-13 20:01:55,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2238 states, 2237 states have (on average 3.6678587393831026) internal successors, (8205), 2237 states have internal predecessors, (8205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:55,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2238 states to 2238 states and 8205 transitions. [2021-07-13 20:01:55,274 INFO L78 Accepts]: Start accepts. Automaton has 2238 states and 8205 transitions. Word has length 24 [2021-07-13 20:01:55,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:55,274 INFO L482 AbstractCegarLoop]: Abstraction has 2238 states and 8205 transitions. [2021-07-13 20:01:55,274 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:55,275 INFO L276 IsEmpty]: Start isEmpty. Operand 2238 states and 8205 transitions. [2021-07-13 20:01:55,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:55,278 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:55,278 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:55,478 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 268 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable512 [2021-07-13 20:01:55,479 INFO L430 AbstractCegarLoop]: === Iteration 280 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:55,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:55,479 INFO L82 PathProgramCache]: Analyzing trace with hash -965943366, now seen corresponding path program 153 times [2021-07-13 20:01:55,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:55,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505100427] [2021-07-13 20:01:55,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:55,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:55,705 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:55,705 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:55,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505100427] [2021-07-13 20:01:55,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1505100427] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:55,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650553303] [2021-07-13 20:01:55,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 269 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 269 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:55,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-13 20:01:55,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:55,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:01:55,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:55,886 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:55,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:01:55,887 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:55,897 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:55,897 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:55,897 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:01:55,987 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:55,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650553303] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:55,987 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:55,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:01:55,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365531995] [2021-07-13 20:01:55,988 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:01:55,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:55,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:01:55,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:01:55,988 INFO L87 Difference]: Start difference. First operand 2238 states and 8205 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:56,330 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 43 [2021-07-13 20:01:57,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:57,666 INFO L93 Difference]: Finished difference Result 2712 states and 9639 transitions. [2021-07-13 20:01:57,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-13 20:01:57,666 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:57,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:57,673 INFO L225 Difference]: With dead ends: 2712 [2021-07-13 20:01:57,674 INFO L226 Difference]: Without dead ends: 2677 [2021-07-13 20:01:57,674 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1332.3ms TimeCoverageRelationStatistics Valid=281, Invalid=1699, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 20:01:57,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2677 states. [2021-07-13 20:01:57,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2677 to 2240. [2021-07-13 20:01:57,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2240 states, 2239 states have (on average 3.6677087985707906) internal successors, (8212), 2239 states have internal predecessors, (8212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:57,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2240 states to 2240 states and 8212 transitions. [2021-07-13 20:01:57,717 INFO L78 Accepts]: Start accepts. Automaton has 2240 states and 8212 transitions. Word has length 24 [2021-07-13 20:01:57,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:57,717 INFO L482 AbstractCegarLoop]: Abstraction has 2240 states and 8212 transitions. [2021-07-13 20:01:57,717 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:57,717 INFO L276 IsEmpty]: Start isEmpty. Operand 2240 states and 8212 transitions. [2021-07-13 20:01:57,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:57,721 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:57,721 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:01:57,944 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 269 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable513 [2021-07-13 20:01:57,945 INFO L430 AbstractCegarLoop]: === Iteration 281 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:01:57,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:01:57,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1799681806, now seen corresponding path program 154 times [2021-07-13 20:01:57,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:01:57,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962513901] [2021-07-13 20:01:57,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:01:57,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:01:58,171 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:58,171 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:01:58,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962513901] [2021-07-13 20:01:58,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962513901] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:58,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634765466] [2021-07-13 20:01:58,171 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 270 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 270 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:01:58,207 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:01:58,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:01:58,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:01:58,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:01:58,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:01:58,348 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:01:58,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:01:58,351 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:01:58,351 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:01:58,442 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:01:58,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634765466] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:01:58,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:01:58,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:01:58,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172776345] [2021-07-13 20:01:58,450 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:01:58,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:01:58,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:01:58,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:01:58,451 INFO L87 Difference]: Start difference. First operand 2240 states and 8212 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:58,792 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 43 [2021-07-13 20:01:59,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:01:59,832 INFO L93 Difference]: Finished difference Result 2727 states and 9699 transitions. [2021-07-13 20:01:59,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 20:01:59,832 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:01:59,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:01:59,839 INFO L225 Difference]: With dead ends: 2727 [2021-07-13 20:01:59,839 INFO L226 Difference]: Without dead ends: 2703 [2021-07-13 20:01:59,840 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 1215.7ms TimeCoverageRelationStatistics Valid=283, Invalid=1523, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:01:59,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2703 states. [2021-07-13 20:01:59,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2703 to 2237. [2021-07-13 20:01:59,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2237 states, 2236 states have (on average 3.6686046511627906) internal successors, (8203), 2236 states have internal predecessors, (8203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:59,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2237 states to 2237 states and 8203 transitions. [2021-07-13 20:01:59,884 INFO L78 Accepts]: Start accepts. Automaton has 2237 states and 8203 transitions. Word has length 24 [2021-07-13 20:01:59,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:01:59,884 INFO L482 AbstractCegarLoop]: Abstraction has 2237 states and 8203 transitions. [2021-07-13 20:01:59,884 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:01:59,884 INFO L276 IsEmpty]: Start isEmpty. Operand 2237 states and 8203 transitions. [2021-07-13 20:01:59,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:01:59,888 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:01:59,888 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:00,112 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable515,270 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:00,113 INFO L430 AbstractCegarLoop]: === Iteration 282 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:00,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:00,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1662660090, now seen corresponding path program 155 times [2021-07-13 20:02:00,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:00,113 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557365072] [2021-07-13 20:02:00,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:00,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:00,321 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:00,321 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:00,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557365072] [2021-07-13 20:02:00,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557365072] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:00,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021216590] [2021-07-13 20:02:00,322 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 271 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 271 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:00,358 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:02:00,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:00,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:00,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:00,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:00,486 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:00,490 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:00,491 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:00,491 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:02:00,565 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:00,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021216590] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:00,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:00,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:02:00,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341661480] [2021-07-13 20:02:00,566 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:02:00,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:00,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:02:00,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:02:00,567 INFO L87 Difference]: Start difference. First operand 2237 states and 8203 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:00,847 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 37 [2021-07-13 20:02:01,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:01,781 INFO L93 Difference]: Finished difference Result 2663 states and 9503 transitions. [2021-07-13 20:02:01,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-13 20:02:01,782 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:01,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:01,787 INFO L225 Difference]: With dead ends: 2663 [2021-07-13 20:02:01,787 INFO L226 Difference]: Without dead ends: 2637 [2021-07-13 20:02:01,788 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 1069.8ms TimeCoverageRelationStatistics Valid=272, Invalid=1368, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:02:01,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2637 states. [2021-07-13 20:02:01,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2637 to 2241. [2021-07-13 20:02:01,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2241 states, 2240 states have (on average 3.6669642857142857) internal successors, (8214), 2240 states have internal predecessors, (8214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:01,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2241 states to 2241 states and 8214 transitions. [2021-07-13 20:02:01,823 INFO L78 Accepts]: Start accepts. Automaton has 2241 states and 8214 transitions. Word has length 24 [2021-07-13 20:02:01,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:01,823 INFO L482 AbstractCegarLoop]: Abstraction has 2241 states and 8214 transitions. [2021-07-13 20:02:01,823 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:01,823 INFO L276 IsEmpty]: Start isEmpty. Operand 2241 states and 8214 transitions. [2021-07-13 20:02:01,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:01,827 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:01,827 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:02,051 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable516,271 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:02,052 INFO L430 AbstractCegarLoop]: === Iteration 283 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:02,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:02,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1986246268, now seen corresponding path program 156 times [2021-07-13 20:02:02,052 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:02,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924918841] [2021-07-13 20:02:02,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:02,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:02,260 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:02,261 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:02,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924918841] [2021-07-13 20:02:02,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924918841] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:02,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097524130] [2021-07-13 20:02:02,261 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 272 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 272 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:02,296 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:02:02,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:02,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:02:02,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:02,427 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:02,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:02:02,428 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:02,440 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:02,440 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:02,441 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:02:02,612 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:02,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1097524130] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:02,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:02,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:02:02,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225765444] [2021-07-13 20:02:02,612 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:02:02,613 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:02,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:02:02,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:02:02,613 INFO L87 Difference]: Start difference. First operand 2241 states and 8214 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:02,968 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 47 [2021-07-13 20:02:04,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:04,249 INFO L93 Difference]: Finished difference Result 2693 states and 9554 transitions. [2021-07-13 20:02:04,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-07-13 20:02:04,250 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:04,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:04,257 INFO L225 Difference]: With dead ends: 2693 [2021-07-13 20:02:04,258 INFO L226 Difference]: Without dead ends: 2665 [2021-07-13 20:02:04,258 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 1516.4ms TimeCoverageRelationStatistics Valid=352, Invalid=1718, Unknown=0, NotChecked=0, Total=2070 [2021-07-13 20:02:04,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2665 states. [2021-07-13 20:02:04,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2665 to 2248. [2021-07-13 20:02:04,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2248 states, 2247 states have (on average 3.6653315531820203) internal successors, (8236), 2247 states have internal predecessors, (8236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:04,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2248 states to 2248 states and 8236 transitions. [2021-07-13 20:02:04,306 INFO L78 Accepts]: Start accepts. Automaton has 2248 states and 8236 transitions. Word has length 24 [2021-07-13 20:02:04,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:04,306 INFO L482 AbstractCegarLoop]: Abstraction has 2248 states and 8236 transitions. [2021-07-13 20:02:04,306 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:04,306 INFO L276 IsEmpty]: Start isEmpty. Operand 2248 states and 8236 transitions. [2021-07-13 20:02:04,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:04,310 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:04,310 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:04,528 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable517,272 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:04,529 INFO L430 AbstractCegarLoop]: === Iteration 284 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:04,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:04,529 INFO L82 PathProgramCache]: Analyzing trace with hash -622976906, now seen corresponding path program 157 times [2021-07-13 20:02:04,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:04,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111817023] [2021-07-13 20:02:04,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:04,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:04,731 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:04,732 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:04,732 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111817023] [2021-07-13 20:02:04,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111817023] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:04,732 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336683502] [2021-07-13 20:02:04,732 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 273 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 273 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:04,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:04,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:04,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:04,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:04,900 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:04,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:04,905 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:04,905 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:02:04,976 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:04,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336683502] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:04,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:04,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:02:04,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126346351] [2021-07-13 20:02:04,977 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:02:04,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:04,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:02:04,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:02:04,977 INFO L87 Difference]: Start difference. First operand 2248 states and 8236 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:05,275 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 37 [2021-07-13 20:02:06,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:06,202 INFO L93 Difference]: Finished difference Result 2567 states and 9221 transitions. [2021-07-13 20:02:06,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:02:06,203 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:06,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:06,209 INFO L225 Difference]: With dead ends: 2567 [2021-07-13 20:02:06,209 INFO L226 Difference]: Without dead ends: 2550 [2021-07-13 20:02:06,209 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 1053.0ms TimeCoverageRelationStatistics Valid=220, Invalid=1186, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 20:02:06,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2550 states. [2021-07-13 20:02:06,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2550 to 2242. [2021-07-13 20:02:06,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2242 states, 2241 states have (on average 3.6675591253904507) internal successors, (8219), 2241 states have internal predecessors, (8219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:06,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2242 states to 2242 states and 8219 transitions. [2021-07-13 20:02:06,249 INFO L78 Accepts]: Start accepts. Automaton has 2242 states and 8219 transitions. Word has length 24 [2021-07-13 20:02:06,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:06,249 INFO L482 AbstractCegarLoop]: Abstraction has 2242 states and 8219 transitions. [2021-07-13 20:02:06,249 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:06,249 INFO L276 IsEmpty]: Start isEmpty. Operand 2242 states and 8219 transitions. [2021-07-13 20:02:06,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:06,253 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:06,253 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:06,476 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 273 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable520 [2021-07-13 20:02:06,477 INFO L430 AbstractCegarLoop]: === Iteration 285 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:06,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:06,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1959736906, now seen corresponding path program 158 times [2021-07-13 20:02:06,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:06,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103599554] [2021-07-13 20:02:06,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:06,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:06,699 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:06,699 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:06,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103599554] [2021-07-13 20:02:06,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103599554] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:06,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86177431] [2021-07-13 20:02:06,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 274 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 274 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:06,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:02:06,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:06,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:06,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:06,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:06,879 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:06,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:06,885 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:06,885 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:02:06,968 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:06,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86177431] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:06,969 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:06,969 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:02:06,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031152971] [2021-07-13 20:02:06,969 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:02:06,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:06,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:02:06,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:02:06,970 INFO L87 Difference]: Start difference. First operand 2242 states and 8219 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:07,301 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 37 [2021-07-13 20:02:08,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:08,394 INFO L93 Difference]: Finished difference Result 2691 states and 9584 transitions. [2021-07-13 20:02:08,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 20:02:08,395 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:08,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:08,401 INFO L225 Difference]: With dead ends: 2691 [2021-07-13 20:02:08,401 INFO L226 Difference]: Without dead ends: 2665 [2021-07-13 20:02:08,402 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1187.7ms TimeCoverageRelationStatistics Valid=278, Invalid=1444, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 20:02:08,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2665 states. [2021-07-13 20:02:08,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2665 to 2242. [2021-07-13 20:02:08,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2242 states, 2241 states have (on average 3.6675591253904507) internal successors, (8219), 2241 states have internal predecessors, (8219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:08,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2242 states to 2242 states and 8219 transitions. [2021-07-13 20:02:08,446 INFO L78 Accepts]: Start accepts. Automaton has 2242 states and 8219 transitions. Word has length 24 [2021-07-13 20:02:08,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:08,446 INFO L482 AbstractCegarLoop]: Abstraction has 2242 states and 8219 transitions. [2021-07-13 20:02:08,446 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:08,446 INFO L276 IsEmpty]: Start isEmpty. Operand 2242 states and 8219 transitions. [2021-07-13 20:02:08,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:08,450 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:08,451 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:08,661 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 274 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable521 [2021-07-13 20:02:08,661 INFO L430 AbstractCegarLoop]: === Iteration 286 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:08,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:08,661 INFO L82 PathProgramCache]: Analyzing trace with hash 168875732, now seen corresponding path program 159 times [2021-07-13 20:02:08,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:08,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254125719] [2021-07-13 20:02:08,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:08,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:08,875 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:08,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:08,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254125719] [2021-07-13 20:02:08,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254125719] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:08,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736681034] [2021-07-13 20:02:08,876 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 275 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 275 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:08,912 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:02:08,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:08,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:02:08,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:09,048 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:09,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:02:09,050 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:09,062 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:09,063 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:09,063 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:02:09,209 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:09,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736681034] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:09,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:09,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:02:09,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426638252] [2021-07-13 20:02:09,210 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:02:09,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:09,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:02:09,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:02:09,210 INFO L87 Difference]: Start difference. First operand 2242 states and 8219 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:09,520 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 46 [2021-07-13 20:02:10,787 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 39 [2021-07-13 20:02:11,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:11,069 INFO L93 Difference]: Finished difference Result 2763 states and 9734 transitions. [2021-07-13 20:02:11,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-07-13 20:02:11,069 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:11,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:11,076 INFO L225 Difference]: With dead ends: 2763 [2021-07-13 20:02:11,076 INFO L226 Difference]: Without dead ends: 2735 [2021-07-13 20:02:11,077 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 657 ImplicationChecksByTransitivity, 1664.6ms TimeCoverageRelationStatistics Valid=380, Invalid=2070, Unknown=0, NotChecked=0, Total=2450 [2021-07-13 20:02:11,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2735 states. [2021-07-13 20:02:11,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2735 to 2242. [2021-07-13 20:02:11,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2242 states, 2241 states have (on average 3.6675591253904507) internal successors, (8219), 2241 states have internal predecessors, (8219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:11,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2242 states to 2242 states and 8219 transitions. [2021-07-13 20:02:11,123 INFO L78 Accepts]: Start accepts. Automaton has 2242 states and 8219 transitions. Word has length 24 [2021-07-13 20:02:11,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:11,123 INFO L482 AbstractCegarLoop]: Abstraction has 2242 states and 8219 transitions. [2021-07-13 20:02:11,123 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:11,123 INFO L276 IsEmpty]: Start isEmpty. Operand 2242 states and 8219 transitions. [2021-07-13 20:02:11,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:11,127 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:11,127 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:11,344 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable522,275 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:11,344 INFO L430 AbstractCegarLoop]: === Iteration 287 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:11,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:11,344 INFO L82 PathProgramCache]: Analyzing trace with hash 950709532, now seen corresponding path program 160 times [2021-07-13 20:02:11,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:11,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071058844] [2021-07-13 20:02:11,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:11,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:11,545 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:11,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:11,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071058844] [2021-07-13 20:02:11,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071058844] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:11,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038306165] [2021-07-13 20:02:11,545 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 276 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 276 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:11,581 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:02:11,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:11,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:11,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:11,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:11,727 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:11,731 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:11,731 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:11,732 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:02:11,831 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:11,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038306165] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:11,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:11,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:02:11,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688430525] [2021-07-13 20:02:11,832 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:02:11,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:11,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:02:11,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:02:11,833 INFO L87 Difference]: Start difference. First operand 2242 states and 8219 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:12,119 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 37 [2021-07-13 20:02:12,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:12,875 INFO L93 Difference]: Finished difference Result 2600 states and 9316 transitions. [2021-07-13 20:02:12,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-07-13 20:02:12,875 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:12,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:12,882 INFO L225 Difference]: With dead ends: 2600 [2021-07-13 20:02:12,883 INFO L226 Difference]: Without dead ends: 2586 [2021-07-13 20:02:12,883 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 914.3ms TimeCoverageRelationStatistics Valid=216, Invalid=1116, Unknown=0, NotChecked=0, Total=1332 [2021-07-13 20:02:12,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2586 states. [2021-07-13 20:02:12,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2586 to 2242. [2021-07-13 20:02:12,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2242 states, 2241 states have (on average 3.6675591253904507) internal successors, (8219), 2241 states have internal predecessors, (8219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:12,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2242 states to 2242 states and 8219 transitions. [2021-07-13 20:02:12,926 INFO L78 Accepts]: Start accepts. Automaton has 2242 states and 8219 transitions. Word has length 24 [2021-07-13 20:02:12,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:12,926 INFO L482 AbstractCegarLoop]: Abstraction has 2242 states and 8219 transitions. [2021-07-13 20:02:12,926 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:12,926 INFO L276 IsEmpty]: Start isEmpty. Operand 2242 states and 8219 transitions. [2021-07-13 20:02:12,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:12,930 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:12,930 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:13,137 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 276 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable525 [2021-07-13 20:02:13,137 INFO L430 AbstractCegarLoop]: === Iteration 288 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:13,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:13,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1895765076, now seen corresponding path program 161 times [2021-07-13 20:02:13,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:13,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687875749] [2021-07-13 20:02:13,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:13,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:13,343 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:13,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:13,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687875749] [2021-07-13 20:02:13,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [687875749] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:13,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203229959] [2021-07-13 20:02:13,343 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 277 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 277 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:13,380 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:02:13,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:13,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:13,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:13,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:13,515 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:13,520 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:13,520 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:13,520 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:02:13,596 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:13,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203229959] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:13,596 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:13,597 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:02:13,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789611267] [2021-07-13 20:02:13,597 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:02:13,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:13,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:02:13,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:02:13,597 INFO L87 Difference]: Start difference. First operand 2242 states and 8219 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:13,901 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 37 [2021-07-13 20:02:14,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:14,863 INFO L93 Difference]: Finished difference Result 2624 states and 9395 transitions. [2021-07-13 20:02:14,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-07-13 20:02:14,864 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:14,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:14,869 INFO L225 Difference]: With dead ends: 2624 [2021-07-13 20:02:14,869 INFO L226 Difference]: Without dead ends: 2601 [2021-07-13 20:02:14,869 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 1080.5ms TimeCoverageRelationStatistics Valid=257, Invalid=1383, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:02:14,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2601 states. [2021-07-13 20:02:14,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2601 to 2244. [2021-07-13 20:02:14,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2244 states, 2243 states have (on average 3.666518056174766) internal successors, (8224), 2243 states have internal predecessors, (8224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:14,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2244 states to 2244 states and 8224 transitions. [2021-07-13 20:02:14,902 INFO L78 Accepts]: Start accepts. Automaton has 2244 states and 8224 transitions. Word has length 24 [2021-07-13 20:02:14,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:14,902 INFO L482 AbstractCegarLoop]: Abstraction has 2244 states and 8224 transitions. [2021-07-13 20:02:14,902 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:14,902 INFO L276 IsEmpty]: Start isEmpty. Operand 2244 states and 8224 transitions. [2021-07-13 20:02:14,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:14,905 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:14,906 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:15,106 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable526,277 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:15,106 INFO L430 AbstractCegarLoop]: === Iteration 289 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:15,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:15,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1419787772, now seen corresponding path program 162 times [2021-07-13 20:02:15,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:15,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057194074] [2021-07-13 20:02:15,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:15,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:15,349 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:15,350 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:15,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057194074] [2021-07-13 20:02:15,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057194074] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:15,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119417844] [2021-07-13 20:02:15,350 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 278 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 278 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:15,383 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:02:15,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:15,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:15,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:15,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:15,509 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:15,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:15,513 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:15,514 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:02:15,588 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:15,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1119417844] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:15,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:15,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:02:15,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636971907] [2021-07-13 20:02:15,588 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:02:15,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:15,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:02:15,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:02:15,589 INFO L87 Difference]: Start difference. First operand 2244 states and 8224 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:16,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:16,583 INFO L93 Difference]: Finished difference Result 2641 states and 9443 transitions. [2021-07-13 20:02:16,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-07-13 20:02:16,583 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:16,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:16,588 INFO L225 Difference]: With dead ends: 2641 [2021-07-13 20:02:16,588 INFO L226 Difference]: Without dead ends: 2619 [2021-07-13 20:02:16,588 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 944.4ms TimeCoverageRelationStatistics Valid=263, Invalid=1377, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:02:16,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2619 states. [2021-07-13 20:02:16,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2619 to 2243. [2021-07-13 20:02:16,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2243 states, 2242 states have (on average 3.6672613737734165) internal successors, (8222), 2242 states have internal predecessors, (8222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:16,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2243 states to 2243 states and 8222 transitions. [2021-07-13 20:02:16,631 INFO L78 Accepts]: Start accepts. Automaton has 2243 states and 8222 transitions. Word has length 24 [2021-07-13 20:02:16,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:16,631 INFO L482 AbstractCegarLoop]: Abstraction has 2243 states and 8222 transitions. [2021-07-13 20:02:16,631 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:16,631 INFO L276 IsEmpty]: Start isEmpty. Operand 2243 states and 8222 transitions. [2021-07-13 20:02:16,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:16,636 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:16,636 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:16,859 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 278 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable527 [2021-07-13 20:02:16,860 INFO L430 AbstractCegarLoop]: === Iteration 290 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:16,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:16,860 INFO L82 PathProgramCache]: Analyzing trace with hash 613259036, now seen corresponding path program 93 times [2021-07-13 20:02:16,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:16,860 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102330430] [2021-07-13 20:02:16,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:16,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:17,142 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:17,143 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:17,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102330430] [2021-07-13 20:02:17,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102330430] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:17,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705814991] [2021-07-13 20:02:17,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 279 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 279 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:17,180 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:02:17,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:17,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:02:17,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:17,367 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:17,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:02:17,369 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:17,379 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:17,380 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:17,380 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:02:17,460 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:17,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705814991] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:17,460 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:17,460 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:02:17,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093884693] [2021-07-13 20:02:17,460 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:02:17,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:17,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:02:17,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:02:17,461 INFO L87 Difference]: Start difference. First operand 2243 states and 8222 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:18,265 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 53 [2021-07-13 20:02:18,996 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 36 [2021-07-13 20:02:20,053 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 41 [2021-07-13 20:02:20,485 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 38 [2021-07-13 20:02:21,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:21,235 INFO L93 Difference]: Finished difference Result 3179 states and 11053 transitions. [2021-07-13 20:02:21,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-07-13 20:02:21,235 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:21,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:21,242 INFO L225 Difference]: With dead ends: 3179 [2021-07-13 20:02:21,242 INFO L226 Difference]: Without dead ends: 3088 [2021-07-13 20:02:21,242 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1403 ImplicationChecksByTransitivity, 3118.6ms TimeCoverageRelationStatistics Valid=685, Invalid=4007, Unknown=0, NotChecked=0, Total=4692 [2021-07-13 20:02:21,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3088 states. [2021-07-13 20:02:21,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3088 to 2264. [2021-07-13 20:02:21,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2264 states, 2263 states have (on average 3.664162615996465) internal successors, (8292), 2263 states have internal predecessors, (8292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:21,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2264 states to 2264 states and 8292 transitions. [2021-07-13 20:02:21,286 INFO L78 Accepts]: Start accepts. Automaton has 2264 states and 8292 transitions. Word has length 24 [2021-07-13 20:02:21,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:21,286 INFO L482 AbstractCegarLoop]: Abstraction has 2264 states and 8292 transitions. [2021-07-13 20:02:21,286 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:21,286 INFO L276 IsEmpty]: Start isEmpty. Operand 2264 states and 8292 transitions. [2021-07-13 20:02:21,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:21,289 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:21,289 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:21,490 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable528,279 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:21,490 INFO L430 AbstractCegarLoop]: === Iteration 291 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:21,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:21,490 INFO L82 PathProgramCache]: Analyzing trace with hash 830683922, now seen corresponding path program 94 times [2021-07-13 20:02:21,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:21,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070035686] [2021-07-13 20:02:21,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:21,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:21,727 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:21,727 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:21,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070035686] [2021-07-13 20:02:21,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070035686] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:21,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936652567] [2021-07-13 20:02:21,727 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 280 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 280 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:21,764 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:02:21,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:21,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:21,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:21,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:21,934 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:21,938 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:21,938 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:21,939 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:02:21,994 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:21,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936652567] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:21,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:21,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:02:21,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35846150] [2021-07-13 20:02:21,995 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:02:21,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:21,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:02:21,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:02:21,995 INFO L87 Difference]: Start difference. First operand 2264 states and 8292 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:22,437 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 34 [2021-07-13 20:02:22,763 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 37 [2021-07-13 20:02:24,384 WARN L205 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 30 [2021-07-13 20:02:24,761 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 35 [2021-07-13 20:02:24,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:24,989 INFO L93 Difference]: Finished difference Result 2991 states and 10538 transitions. [2021-07-13 20:02:24,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-07-13 20:02:24,990 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:24,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:24,996 INFO L225 Difference]: With dead ends: 2991 [2021-07-13 20:02:24,997 INFO L226 Difference]: Without dead ends: 2941 [2021-07-13 20:02:24,997 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 944 ImplicationChecksByTransitivity, 2726.1ms TimeCoverageRelationStatistics Valid=596, Invalid=2596, Unknown=0, NotChecked=0, Total=3192 [2021-07-13 20:02:25,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2941 states. [2021-07-13 20:02:25,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2941 to 2278. [2021-07-13 20:02:25,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2278 states, 2277 states have (on average 3.6644707949055775) internal successors, (8344), 2277 states have internal predecessors, (8344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:25,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2278 states to 2278 states and 8344 transitions. [2021-07-13 20:02:25,043 INFO L78 Accepts]: Start accepts. Automaton has 2278 states and 8344 transitions. Word has length 24 [2021-07-13 20:02:25,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:25,043 INFO L482 AbstractCegarLoop]: Abstraction has 2278 states and 8344 transitions. [2021-07-13 20:02:25,043 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:25,043 INFO L276 IsEmpty]: Start isEmpty. Operand 2278 states and 8344 transitions. [2021-07-13 20:02:25,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:25,047 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:25,047 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:25,271 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 280 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable531 [2021-07-13 20:02:25,272 INFO L430 AbstractCegarLoop]: === Iteration 292 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:25,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:25,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1255427878, now seen corresponding path program 163 times [2021-07-13 20:02:25,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:25,272 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588263405] [2021-07-13 20:02:25,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:25,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:25,536 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:25,536 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:25,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588263405] [2021-07-13 20:02:25,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588263405] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:25,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285473850] [2021-07-13 20:02:25,537 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 281 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 281 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:25,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:25,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:25,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:25,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:02:25,747 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:25,749 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:25,749 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:25,749 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:02:25,782 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:25,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285473850] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:25,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:25,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:02:25,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574047563] [2021-07-13 20:02:25,782 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:02:25,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:25,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:02:25,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:02:25,783 INFO L87 Difference]: Start difference. First operand 2278 states and 8344 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:26,169 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 38 [2021-07-13 20:02:26,435 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 44 [2021-07-13 20:02:28,163 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 40 [2021-07-13 20:02:28,629 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2021-07-13 20:02:29,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:29,199 INFO L93 Difference]: Finished difference Result 3202 states and 11156 transitions. [2021-07-13 20:02:29,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-07-13 20:02:29,199 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:29,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:29,208 INFO L225 Difference]: With dead ends: 3202 [2021-07-13 20:02:29,208 INFO L226 Difference]: Without dead ends: 3150 [2021-07-13 20:02:29,208 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1388 ImplicationChecksByTransitivity, 2930.8ms TimeCoverageRelationStatistics Valid=736, Invalid=3820, Unknown=0, NotChecked=0, Total=4556 [2021-07-13 20:02:29,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3150 states. [2021-07-13 20:02:29,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3150 to 2284. [2021-07-13 20:02:29,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2284 states, 2283 states have (on average 3.6649145860709593) internal successors, (8367), 2283 states have internal predecessors, (8367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:29,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2284 states to 2284 states and 8367 transitions. [2021-07-13 20:02:29,257 INFO L78 Accepts]: Start accepts. Automaton has 2284 states and 8367 transitions. Word has length 24 [2021-07-13 20:02:29,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:29,257 INFO L482 AbstractCegarLoop]: Abstraction has 2284 states and 8367 transitions. [2021-07-13 20:02:29,257 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:29,257 INFO L276 IsEmpty]: Start isEmpty. Operand 2284 states and 8367 transitions. [2021-07-13 20:02:29,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:29,261 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:29,261 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:29,479 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 281 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable532 [2021-07-13 20:02:29,479 INFO L430 AbstractCegarLoop]: === Iteration 293 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:29,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:29,480 INFO L82 PathProgramCache]: Analyzing trace with hash 227278018, now seen corresponding path program 164 times [2021-07-13 20:02:29,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:29,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711920977] [2021-07-13 20:02:29,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:29,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:29,701 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:29,701 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:29,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711920977] [2021-07-13 20:02:29,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711920977] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:29,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248940532] [2021-07-13 20:02:29,702 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 282 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 282 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:29,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:02:29,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:29,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:02:29,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:29,907 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:29,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:02:29,908 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:29,920 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:29,921 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:29,921 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:02:30,030 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:30,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248940532] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:30,030 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:30,030 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:02:30,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400990389] [2021-07-13 20:02:30,030 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:02:30,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:30,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:02:30,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:02:30,031 INFO L87 Difference]: Start difference. First operand 2284 states and 8367 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:30,467 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 38 [2021-07-13 20:02:30,749 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 49 [2021-07-13 20:02:31,497 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 40 [2021-07-13 20:02:33,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:33,043 INFO L93 Difference]: Finished difference Result 2986 states and 10490 transitions. [2021-07-13 20:02:33,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-07-13 20:02:33,044 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:33,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:33,050 INFO L225 Difference]: With dead ends: 2986 [2021-07-13 20:02:33,050 INFO L226 Difference]: Without dead ends: 2917 [2021-07-13 20:02:33,050 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1264 ImplicationChecksByTransitivity, 2658.6ms TimeCoverageRelationStatistics Valid=659, Invalid=3373, Unknown=0, NotChecked=0, Total=4032 [2021-07-13 20:02:33,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2917 states. [2021-07-13 20:02:33,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2917 to 2288. [2021-07-13 20:02:33,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2288 states, 2287 states have (on average 3.6637516397026673) internal successors, (8379), 2287 states have internal predecessors, (8379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:33,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2288 states to 2288 states and 8379 transitions. [2021-07-13 20:02:33,085 INFO L78 Accepts]: Start accepts. Automaton has 2288 states and 8379 transitions. Word has length 24 [2021-07-13 20:02:33,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:33,085 INFO L482 AbstractCegarLoop]: Abstraction has 2288 states and 8379 transitions. [2021-07-13 20:02:33,085 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:33,085 INFO L276 IsEmpty]: Start isEmpty. Operand 2288 states and 8379 transitions. [2021-07-13 20:02:33,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:33,105 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:33,105 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:33,306 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable533,282 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:33,306 INFO L430 AbstractCegarLoop]: === Iteration 294 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:33,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:33,306 INFO L82 PathProgramCache]: Analyzing trace with hash 550864196, now seen corresponding path program 165 times [2021-07-13 20:02:33,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:33,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672853522] [2021-07-13 20:02:33,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:33,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:33,486 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:33,486 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:33,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672853522] [2021-07-13 20:02:33,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672853522] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:33,487 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178108431] [2021-07-13 20:02:33,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 283 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 283 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:33,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 20:02:33,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:33,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:02:33,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:33,647 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:33,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:02:33,649 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:33,659 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:33,659 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:33,660 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:02:33,753 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:33,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178108431] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:33,754 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:33,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:02:33,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985724260] [2021-07-13 20:02:33,754 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:02:33,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:33,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:02:33,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:02:33,754 INFO L87 Difference]: Start difference. First operand 2288 states and 8379 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:34,332 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 49 [2021-07-13 20:02:34,937 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 45 [2021-07-13 20:02:36,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:36,542 INFO L93 Difference]: Finished difference Result 2940 states and 10329 transitions. [2021-07-13 20:02:36,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-07-13 20:02:36,543 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:36,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:36,549 INFO L225 Difference]: With dead ends: 2940 [2021-07-13 20:02:36,549 INFO L226 Difference]: Without dead ends: 2900 [2021-07-13 20:02:36,549 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 2404.8ms TimeCoverageRelationStatistics Valid=683, Invalid=3739, Unknown=0, NotChecked=0, Total=4422 [2021-07-13 20:02:36,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2900 states. [2021-07-13 20:02:36,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2900 to 2296. [2021-07-13 20:02:36,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2296 states, 2295 states have (on average 3.6631808278867104) internal successors, (8407), 2295 states have internal predecessors, (8407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:36,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2296 states to 2296 states and 8407 transitions. [2021-07-13 20:02:36,583 INFO L78 Accepts]: Start accepts. Automaton has 2296 states and 8407 transitions. Word has length 24 [2021-07-13 20:02:36,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:36,583 INFO L482 AbstractCegarLoop]: Abstraction has 2296 states and 8407 transitions. [2021-07-13 20:02:36,584 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:36,584 INFO L276 IsEmpty]: Start isEmpty. Operand 2296 states and 8407 transitions. [2021-07-13 20:02:36,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:36,587 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:36,587 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:36,787 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 283 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable536 [2021-07-13 20:02:36,788 INFO L430 AbstractCegarLoop]: === Iteration 295 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:36,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:36,788 INFO L82 PathProgramCache]: Analyzing trace with hash -2058358978, now seen corresponding path program 166 times [2021-07-13 20:02:36,788 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:36,788 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353125236] [2021-07-13 20:02:36,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:36,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:37,018 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:37,019 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:37,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353125236] [2021-07-13 20:02:37,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353125236] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:37,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892116782] [2021-07-13 20:02:37,019 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 284 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 284 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:37,054 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:02:37,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:37,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:37,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:37,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:37,196 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:37,198 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:37,199 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:37,199 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:02:37,241 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:37,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892116782] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:37,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:37,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:02:37,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535475223] [2021-07-13 20:02:37,242 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:02:37,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:37,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:02:37,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:02:37,242 INFO L87 Difference]: Start difference. First operand 2296 states and 8407 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:39,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:39,212 INFO L93 Difference]: Finished difference Result 2804 states and 9972 transitions. [2021-07-13 20:02:39,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-07-13 20:02:39,213 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:39,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:39,218 INFO L225 Difference]: With dead ends: 2804 [2021-07-13 20:02:39,218 INFO L226 Difference]: Without dead ends: 2783 [2021-07-13 20:02:39,218 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 1720.7ms TimeCoverageRelationStatistics Valid=514, Invalid=2566, Unknown=0, NotChecked=0, Total=3080 [2021-07-13 20:02:39,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2783 states. [2021-07-13 20:02:39,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2783 to 2280. [2021-07-13 20:02:39,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2280 states, 2279 states have (on average 3.6652040368582712) internal successors, (8353), 2279 states have internal predecessors, (8353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:39,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2280 states to 2280 states and 8353 transitions. [2021-07-13 20:02:39,251 INFO L78 Accepts]: Start accepts. Automaton has 2280 states and 8353 transitions. Word has length 24 [2021-07-13 20:02:39,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:39,251 INFO L482 AbstractCegarLoop]: Abstraction has 2280 states and 8353 transitions. [2021-07-13 20:02:39,251 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:39,251 INFO L276 IsEmpty]: Start isEmpty. Operand 2280 states and 8353 transitions. [2021-07-13 20:02:39,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:39,254 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:39,254 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:39,454 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable539,284 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:39,455 INFO L430 AbstractCegarLoop]: === Iteration 296 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:39,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:39,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1599381192, now seen corresponding path program 95 times [2021-07-13 20:02:39,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:39,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179816221] [2021-07-13 20:02:39,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:39,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:39,638 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:39,639 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:39,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179816221] [2021-07-13 20:02:39,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179816221] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:39,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845425904] [2021-07-13 20:02:39,639 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 285 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 285 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:39,672 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:02:39,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:39,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:39,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:39,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:39,791 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:39,793 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:39,794 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:39,794 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:02:39,841 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:39,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845425904] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:39,841 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:39,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:02:39,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019408689] [2021-07-13 20:02:39,841 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:02:39,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:39,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:02:39,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:02:39,842 INFO L87 Difference]: Start difference. First operand 2280 states and 8353 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:42,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:42,561 INFO L93 Difference]: Finished difference Result 4178 states and 14207 transitions. [2021-07-13 20:02:42,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-07-13 20:02:42,562 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:42,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:42,570 INFO L225 Difference]: With dead ends: 4178 [2021-07-13 20:02:42,570 INFO L226 Difference]: Without dead ends: 4124 [2021-07-13 20:02:42,571 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1961 ImplicationChecksByTransitivity, 2345.7ms TimeCoverageRelationStatistics Valid=1073, Invalid=4627, Unknown=0, NotChecked=0, Total=5700 [2021-07-13 20:02:42,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4124 states. [2021-07-13 20:02:42,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4124 to 2366. [2021-07-13 20:02:42,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2366 states, 2365 states have (on average 3.6841437632135308) internal successors, (8713), 2365 states have internal predecessors, (8713), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:42,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2366 states to 2366 states and 8713 transitions. [2021-07-13 20:02:42,629 INFO L78 Accepts]: Start accepts. Automaton has 2366 states and 8713 transitions. Word has length 24 [2021-07-13 20:02:42,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:42,629 INFO L482 AbstractCegarLoop]: Abstraction has 2366 states and 8713 transitions. [2021-07-13 20:02:42,629 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:42,629 INFO L276 IsEmpty]: Start isEmpty. Operand 2366 states and 8713 transitions. [2021-07-13 20:02:42,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:42,633 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:42,633 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:42,833 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 285 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable540 [2021-07-13 20:02:42,833 INFO L430 AbstractCegarLoop]: === Iteration 297 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:42,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:42,834 INFO L82 PathProgramCache]: Analyzing trace with hash 904724930, now seen corresponding path program 96 times [2021-07-13 20:02:42,834 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:42,834 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630424027] [2021-07-13 20:02:42,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:42,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:43,025 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:43,025 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:43,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630424027] [2021-07-13 20:02:43,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630424027] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:43,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713216182] [2021-07-13 20:02:43,025 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 286 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 286 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:43,053 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:02:43,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:43,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:02:43,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:43,183 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:43,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:02:43,185 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:43,195 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:43,195 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:43,195 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:02:43,293 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:43,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1713216182] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:43,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:43,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:02:43,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845369587] [2021-07-13 20:02:43,294 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:02:43,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:43,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:02:43,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:02:43,294 INFO L87 Difference]: Start difference. First operand 2366 states and 8713 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:43,663 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 30 [2021-07-13 20:02:44,011 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 36 [2021-07-13 20:02:44,463 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 36 [2021-07-13 20:02:45,989 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 37 [2021-07-13 20:02:46,384 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 35 [2021-07-13 20:02:46,589 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 35 [2021-07-13 20:02:47,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:47,025 INFO L93 Difference]: Finished difference Result 3774 states and 13082 transitions. [2021-07-13 20:02:47,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-07-13 20:02:47,025 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:47,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:47,033 INFO L225 Difference]: With dead ends: 3774 [2021-07-13 20:02:47,033 INFO L226 Difference]: Without dead ends: 3752 [2021-07-13 20:02:47,033 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2446 ImplicationChecksByTransitivity, 3341.1ms TimeCoverageRelationStatistics Valid=1227, Invalid=5579, Unknown=0, NotChecked=0, Total=6806 [2021-07-13 20:02:47,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3752 states. [2021-07-13 20:02:47,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3752 to 2395. [2021-07-13 20:02:47,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2395 states, 2394 states have (on average 3.6875522138680035) internal successors, (8828), 2394 states have internal predecessors, (8828), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:47,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2395 states to 2395 states and 8828 transitions. [2021-07-13 20:02:47,074 INFO L78 Accepts]: Start accepts. Automaton has 2395 states and 8828 transitions. Word has length 24 [2021-07-13 20:02:47,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:47,074 INFO L482 AbstractCegarLoop]: Abstraction has 2395 states and 8828 transitions. [2021-07-13 20:02:47,074 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:47,074 INFO L276 IsEmpty]: Start isEmpty. Operand 2395 states and 8828 transitions. [2021-07-13 20:02:47,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:47,078 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:47,078 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:47,278 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 286 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable541 [2021-07-13 20:02:47,278 INFO L430 AbstractCegarLoop]: === Iteration 298 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:47,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:47,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1686558730, now seen corresponding path program 97 times [2021-07-13 20:02:47,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:47,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578887336] [2021-07-13 20:02:47,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:47,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:47,462 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:47,462 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:47,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578887336] [2021-07-13 20:02:47,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578887336] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:47,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84743011] [2021-07-13 20:02:47,462 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 287 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 287 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:47,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:47,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:47,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:47,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:47,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:47,627 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:47,627 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:47,628 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:02:47,679 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:47,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84743011] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:47,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:47,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:02:47,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130175026] [2021-07-13 20:02:47,679 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:02:47,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:47,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:02:47,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:02:47,680 INFO L87 Difference]: Start difference. First operand 2395 states and 8828 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:50,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:50,320 INFO L93 Difference]: Finished difference Result 3784 states and 13107 transitions. [2021-07-13 20:02:50,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-07-13 20:02:50,320 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:50,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:50,328 INFO L225 Difference]: With dead ends: 3784 [2021-07-13 20:02:50,328 INFO L226 Difference]: Without dead ends: 3728 [2021-07-13 20:02:50,328 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1963 ImplicationChecksByTransitivity, 2324.4ms TimeCoverageRelationStatistics Valid=938, Invalid=4612, Unknown=0, NotChecked=0, Total=5550 [2021-07-13 20:02:50,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3728 states. [2021-07-13 20:02:50,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3728 to 2433. [2021-07-13 20:02:50,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2433 states, 2432 states have (on average 3.6969572368421053) internal successors, (8991), 2432 states have internal predecessors, (8991), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:50,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2433 states to 2433 states and 8991 transitions. [2021-07-13 20:02:50,370 INFO L78 Accepts]: Start accepts. Automaton has 2433 states and 8991 transitions. Word has length 24 [2021-07-13 20:02:50,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:50,371 INFO L482 AbstractCegarLoop]: Abstraction has 2433 states and 8991 transitions. [2021-07-13 20:02:50,371 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:50,371 INFO L276 IsEmpty]: Start isEmpty. Operand 2433 states and 8991 transitions. [2021-07-13 20:02:50,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:50,374 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:50,374 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:50,574 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable544,287 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:50,575 INFO L430 AbstractCegarLoop]: === Iteration 299 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:50,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:50,575 INFO L82 PathProgramCache]: Analyzing trace with hash 638091246, now seen corresponding path program 167 times [2021-07-13 20:02:50,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:50,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920992758] [2021-07-13 20:02:50,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:50,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:50,752 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:50,752 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:50,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920992758] [2021-07-13 20:02:50,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920992758] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:50,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497296583] [2021-07-13 20:02:50,752 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 288 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 288 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:50,780 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:02:50,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:50,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:02:50,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:50,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:02:50,900 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:50,902 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:50,903 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:50,903 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:02:50,950 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:50,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497296583] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:50,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:50,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:02:50,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902031982] [2021-07-13 20:02:50,951 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:02:50,951 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:50,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:02:50,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:02:50,951 INFO L87 Difference]: Start difference. First operand 2433 states and 8991 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:52,947 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 32 [2021-07-13 20:02:54,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:54,146 INFO L93 Difference]: Finished difference Result 4247 states and 14593 transitions. [2021-07-13 20:02:54,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-07-13 20:02:54,146 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:54,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:54,155 INFO L225 Difference]: With dead ends: 4247 [2021-07-13 20:02:54,155 INFO L226 Difference]: Without dead ends: 4186 [2021-07-13 20:02:54,155 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2142 ImplicationChecksByTransitivity, 2626.8ms TimeCoverageRelationStatistics Valid=1171, Invalid=5149, Unknown=0, NotChecked=0, Total=6320 [2021-07-13 20:02:54,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4186 states. [2021-07-13 20:02:54,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4186 to 2486. [2021-07-13 20:02:54,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2486 states, 2485 states have (on average 3.719919517102616) internal successors, (9244), 2485 states have internal predecessors, (9244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:54,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2486 states to 2486 states and 9244 transitions. [2021-07-13 20:02:54,214 INFO L78 Accepts]: Start accepts. Automaton has 2486 states and 9244 transitions. Word has length 24 [2021-07-13 20:02:54,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:54,214 INFO L482 AbstractCegarLoop]: Abstraction has 2486 states and 9244 transitions. [2021-07-13 20:02:54,214 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:54,214 INFO L276 IsEmpty]: Start isEmpty. Operand 2486 states and 9244 transitions. [2021-07-13 20:02:54,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:54,219 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:54,219 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:54,443 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 288 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable545 [2021-07-13 20:02:54,443 INFO L430 AbstractCegarLoop]: === Iteration 300 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:54,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:54,444 INFO L82 PathProgramCache]: Analyzing trace with hash 961677424, now seen corresponding path program 168 times [2021-07-13 20:02:54,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:54,444 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65426700] [2021-07-13 20:02:54,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:54,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:54,656 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:54,657 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:54,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65426700] [2021-07-13 20:02:54,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65426700] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:54,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693823135] [2021-07-13 20:02:54,657 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 289 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 289 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:54,692 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:02:54,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:54,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:02:54,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:54,839 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:54,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:02:54,840 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:54,852 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:54,852 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:54,853 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:02:54,939 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:54,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693823135] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:54,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:54,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:02:54,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607139458] [2021-07-13 20:02:54,940 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:02:54,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:54,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:02:54,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:02:54,940 INFO L87 Difference]: Start difference. First operand 2486 states and 9244 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:58,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:02:58,212 INFO L93 Difference]: Finished difference Result 3963 states and 13816 transitions. [2021-07-13 20:02:58,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-07-13 20:02:58,213 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:02:58,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:02:58,224 INFO L225 Difference]: With dead ends: 3963 [2021-07-13 20:02:58,224 INFO L226 Difference]: Without dead ends: 3909 [2021-07-13 20:02:58,225 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1979 ImplicationChecksByTransitivity, 2784.2ms TimeCoverageRelationStatistics Valid=1022, Invalid=4830, Unknown=0, NotChecked=0, Total=5852 [2021-07-13 20:02:58,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3909 states. [2021-07-13 20:02:58,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3909 to 2494. [2021-07-13 20:02:58,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2494 states, 2493 states have (on average 3.724027276373847) internal successors, (9284), 2493 states have internal predecessors, (9284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:58,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2494 states to 2494 states and 9284 transitions. [2021-07-13 20:02:58,290 INFO L78 Accepts]: Start accepts. Automaton has 2494 states and 9284 transitions. Word has length 24 [2021-07-13 20:02:58,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:02:58,290 INFO L482 AbstractCegarLoop]: Abstraction has 2494 states and 9284 transitions. [2021-07-13 20:02:58,290 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:02:58,290 INFO L276 IsEmpty]: Start isEmpty. Operand 2494 states and 9284 transitions. [2021-07-13 20:02:58,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:02:58,294 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:02:58,294 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:02:58,494 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable546,289 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:58,495 INFO L430 AbstractCegarLoop]: === Iteration 301 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:02:58,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:02:58,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1498600092, now seen corresponding path program 98 times [2021-07-13 20:02:58,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:02:58,495 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439867478] [2021-07-13 20:02:58,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:02:58,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:02:58,718 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:58,718 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:02:58,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439867478] [2021-07-13 20:02:58,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439867478] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:58,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211484437] [2021-07-13 20:02:58,719 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 290 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 290 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:02:58,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:02:58,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:02:58,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:02:58,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:02:58,913 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:58,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:02:58,915 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:02:58,925 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:02:58,926 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:02:58,926 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:02:59,008 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:02:59,009 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211484437] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:02:59,009 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:02:59,009 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:02:59,009 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265709880] [2021-07-13 20:02:59,009 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:02:59,009 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:02:59,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:02:59,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:02:59,010 INFO L87 Difference]: Start difference. First operand 2494 states and 9284 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:02,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:02,239 INFO L93 Difference]: Finished difference Result 4202 states and 14799 transitions. [2021-07-13 20:03:02,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-07-13 20:03:02,239 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:02,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:02,248 INFO L225 Difference]: With dead ends: 4202 [2021-07-13 20:03:02,248 INFO L226 Difference]: Without dead ends: 4168 [2021-07-13 20:03:02,248 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2126 ImplicationChecksByTransitivity, 2718.7ms TimeCoverageRelationStatistics Valid=988, Invalid=5332, Unknown=0, NotChecked=0, Total=6320 [2021-07-13 20:03:02,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4168 states. [2021-07-13 20:03:02,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4168 to 2769. [2021-07-13 20:03:02,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2769 states, 2768 states have (on average 3.7846820809248554) internal successors, (10476), 2768 states have internal predecessors, (10476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:02,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2769 states to 2769 states and 10476 transitions. [2021-07-13 20:03:02,299 INFO L78 Accepts]: Start accepts. Automaton has 2769 states and 10476 transitions. Word has length 24 [2021-07-13 20:03:02,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:02,299 INFO L482 AbstractCegarLoop]: Abstraction has 2769 states and 10476 transitions. [2021-07-13 20:03:02,299 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:02,300 INFO L276 IsEmpty]: Start isEmpty. Operand 2769 states and 10476 transitions. [2021-07-13 20:03:02,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:02,303 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:02,303 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:02,504 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 290 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable548 [2021-07-13 20:03:02,504 INFO L430 AbstractCegarLoop]: === Iteration 302 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:02,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:02,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1293681958, now seen corresponding path program 169 times [2021-07-13 20:03:02,504 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:02,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175529784] [2021-07-13 20:03:02,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:02,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:02,687 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:02,687 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:02,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175529784] [2021-07-13 20:03:02,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175529784] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:02,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425523119] [2021-07-13 20:03:02,687 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 291 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 291 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:02,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:02,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:02,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:02,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:03:02,845 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:02,846 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:02,847 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:02,847 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:03:02,882 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:02,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425523119] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:02,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:02,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:02,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175375391] [2021-07-13 20:03:02,882 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:02,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:02,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:02,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:02,883 INFO L87 Difference]: Start difference. First operand 2769 states and 10476 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:05,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:05,848 INFO L93 Difference]: Finished difference Result 4592 states and 16115 transitions. [2021-07-13 20:03:05,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-07-13 20:03:05,848 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:05,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:05,860 INFO L225 Difference]: With dead ends: 4592 [2021-07-13 20:03:05,860 INFO L226 Difference]: Without dead ends: 4538 [2021-07-13 20:03:05,860 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1858 ImplicationChecksByTransitivity, 2472.5ms TimeCoverageRelationStatistics Valid=1040, Invalid=4510, Unknown=0, NotChecked=0, Total=5550 [2021-07-13 20:03:05,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4538 states. [2021-07-13 20:03:05,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4538 to 2781. [2021-07-13 20:03:05,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2781 states, 2780 states have (on average 3.7827338129496404) internal successors, (10516), 2780 states have internal predecessors, (10516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:05,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2781 states to 2781 states and 10516 transitions. [2021-07-13 20:03:05,929 INFO L78 Accepts]: Start accepts. Automaton has 2781 states and 10516 transitions. Word has length 24 [2021-07-13 20:03:05,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:05,929 INFO L482 AbstractCegarLoop]: Abstraction has 2781 states and 10516 transitions. [2021-07-13 20:03:05,929 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:05,929 INFO L276 IsEmpty]: Start isEmpty. Operand 2781 states and 10516 transitions. [2021-07-13 20:03:05,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:05,934 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:05,934 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:06,152 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable550,291 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:06,152 INFO L430 AbstractCegarLoop]: === Iteration 303 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:06,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:06,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1026428984, now seen corresponding path program 170 times [2021-07-13 20:03:06,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:06,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378629807] [2021-07-13 20:03:06,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:06,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:06,430 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:06,431 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:06,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378629807] [2021-07-13 20:03:06,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378629807] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:06,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658910170] [2021-07-13 20:03:06,431 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 292 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 292 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:06,466 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:03:06,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:06,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:03:06,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:06,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:03:06,729 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:03:06,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:03:06,731 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:06,739 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:06,741 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:06,741 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 20:03:06,777 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:06,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658910170] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:06,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:06,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:03:06,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011743144] [2021-07-13 20:03:06,777 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:03:06,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:06,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:03:06,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:03:06,778 INFO L87 Difference]: Start difference. First operand 2781 states and 10516 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:07,163 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-07-13 20:03:07,710 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 38 [2021-07-13 20:03:09,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:09,049 INFO L93 Difference]: Finished difference Result 3378 states and 12278 transitions. [2021-07-13 20:03:09,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-07-13 20:03:09,050 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:09,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:09,058 INFO L225 Difference]: With dead ends: 3378 [2021-07-13 20:03:09,059 INFO L226 Difference]: Without dead ends: 3328 [2021-07-13 20:03:09,059 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 1733.6ms TimeCoverageRelationStatistics Valid=357, Invalid=2093, Unknown=0, NotChecked=0, Total=2450 [2021-07-13 20:03:09,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3328 states. [2021-07-13 20:03:09,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3328 to 2785. [2021-07-13 20:03:09,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2785 states, 2784 states have (on average 3.7819683908045976) internal successors, (10529), 2784 states have internal predecessors, (10529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:09,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2785 states to 2785 states and 10529 transitions. [2021-07-13 20:03:09,115 INFO L78 Accepts]: Start accepts. Automaton has 2785 states and 10529 transitions. Word has length 24 [2021-07-13 20:03:09,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:09,115 INFO L482 AbstractCegarLoop]: Abstraction has 2785 states and 10529 transitions. [2021-07-13 20:03:09,115 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:09,115 INFO L276 IsEmpty]: Start isEmpty. Operand 2785 states and 10529 transitions. [2021-07-13 20:03:09,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:09,120 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:09,120 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:09,342 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 292 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable551 [2021-07-13 20:03:09,343 INFO L430 AbstractCegarLoop]: === Iteration 304 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:09,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:09,343 INFO L82 PathProgramCache]: Analyzing trace with hash -2054578844, now seen corresponding path program 171 times [2021-07-13 20:03:09,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:09,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893682139] [2021-07-13 20:03:09,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:09,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:09,561 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:09,561 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:09,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893682139] [2021-07-13 20:03:09,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893682139] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:09,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071731695] [2021-07-13 20:03:09,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 293 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 293 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:09,602 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 20:03:09,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:09,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:03:09,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:09,771 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:09,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:03:09,773 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:09,784 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:09,784 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:09,785 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:03:09,897 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:09,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071731695] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:09,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:09,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:03:09,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054914230] [2021-07-13 20:03:09,898 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:03:09,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:09,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:03:09,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=417, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:03:09,898 INFO L87 Difference]: Start difference. First operand 2785 states and 10529 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:10,293 WARN L205 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 49 [2021-07-13 20:03:10,798 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 40 [2021-07-13 20:03:11,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:11,673 INFO L93 Difference]: Finished difference Result 3256 states and 11952 transitions. [2021-07-13 20:03:11,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-07-13 20:03:11,673 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:11,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:11,681 INFO L225 Difference]: With dead ends: 3256 [2021-07-13 20:03:11,681 INFO L226 Difference]: Without dead ends: 3220 [2021-07-13 20:03:11,681 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 1649.3ms TimeCoverageRelationStatistics Valid=371, Invalid=1981, Unknown=0, NotChecked=0, Total=2352 [2021-07-13 20:03:11,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3220 states. [2021-07-13 20:03:11,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3220 to 2790. [2021-07-13 20:03:11,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2790 states, 2789 states have (on average 3.7805665112943707) internal successors, (10544), 2789 states have internal predecessors, (10544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:11,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2790 states to 2790 states and 10544 transitions. [2021-07-13 20:03:11,727 INFO L78 Accepts]: Start accepts. Automaton has 2790 states and 10544 transitions. Word has length 24 [2021-07-13 20:03:11,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:11,728 INFO L482 AbstractCegarLoop]: Abstraction has 2790 states and 10544 transitions. [2021-07-13 20:03:11,728 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:11,728 INFO L276 IsEmpty]: Start isEmpty. Operand 2790 states and 10544 transitions. [2021-07-13 20:03:11,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:11,733 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:11,733 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:11,933 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 293 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable552 [2021-07-13 20:03:11,933 INFO L430 AbstractCegarLoop]: === Iteration 305 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:11,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:11,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1730992666, now seen corresponding path program 172 times [2021-07-13 20:03:11,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:11,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468483643] [2021-07-13 20:03:11,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:11,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:12,117 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:12,117 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:12,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468483643] [2021-07-13 20:03:12,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468483643] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:12,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381438906] [2021-07-13 20:03:12,118 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 294 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 294 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:12,145 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:03:12,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:12,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:12,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:12,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:12,294 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:12,296 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:12,297 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:12,297 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:03:12,344 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:12,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381438906] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:12,344 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:12,345 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:12,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262383595] [2021-07-13 20:03:12,345 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:12,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:12,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:12,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:12,345 INFO L87 Difference]: Start difference. First operand 2790 states and 10544 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:12,600 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2021-07-13 20:03:13,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:13,674 INFO L93 Difference]: Finished difference Result 3207 states and 11839 transitions. [2021-07-13 20:03:13,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 20:03:13,675 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:13,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:13,682 INFO L225 Difference]: With dead ends: 3207 [2021-07-13 20:03:13,682 INFO L226 Difference]: Without dead ends: 3182 [2021-07-13 20:03:13,682 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 1174.1ms TimeCoverageRelationStatistics Valid=309, Invalid=1583, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 20:03:13,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3182 states. [2021-07-13 20:03:13,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3182 to 2783. [2021-07-13 20:03:13,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2783 states, 2782 states have (on average 3.782530553558591) internal successors, (10523), 2782 states have internal predecessors, (10523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:13,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2783 states to 2783 states and 10523 transitions. [2021-07-13 20:03:13,727 INFO L78 Accepts]: Start accepts. Automaton has 2783 states and 10523 transitions. Word has length 24 [2021-07-13 20:03:13,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:13,727 INFO L482 AbstractCegarLoop]: Abstraction has 2783 states and 10523 transitions. [2021-07-13 20:03:13,727 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:13,727 INFO L276 IsEmpty]: Start isEmpty. Operand 2783 states and 10523 transitions. [2021-07-13 20:03:13,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:13,731 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:13,731 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:13,931 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 294 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable555 [2021-07-13 20:03:13,932 INFO L430 AbstractCegarLoop]: === Iteration 306 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:13,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:13,932 INFO L82 PathProgramCache]: Analyzing trace with hash -406982280, now seen corresponding path program 173 times [2021-07-13 20:03:13,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:13,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378677073] [2021-07-13 20:03:13,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:13,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:14,171 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:14,171 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:14,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378677073] [2021-07-13 20:03:14,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378677073] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:14,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465088102] [2021-07-13 20:03:14,171 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 295 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 295 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:14,199 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:03:14,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:14,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:14,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:14,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:03:14,362 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:14,363 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:14,363 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:14,363 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 20:03:14,394 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:14,395 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465088102] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:14,395 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:14,395 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:03:14,395 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121809843] [2021-07-13 20:03:14,395 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:03:14,395 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:14,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:03:14,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:03:14,395 INFO L87 Difference]: Start difference. First operand 2783 states and 10523 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:14,671 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 44 [2021-07-13 20:03:16,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:16,267 INFO L93 Difference]: Finished difference Result 3338 states and 12184 transitions. [2021-07-13 20:03:16,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-07-13 20:03:16,267 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:16,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:16,273 INFO L225 Difference]: With dead ends: 3338 [2021-07-13 20:03:16,273 INFO L226 Difference]: Without dead ends: 3302 [2021-07-13 20:03:16,273 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1550.0ms TimeCoverageRelationStatistics Valid=390, Invalid=2366, Unknown=0, NotChecked=0, Total=2756 [2021-07-13 20:03:16,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3302 states. [2021-07-13 20:03:16,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3302 to 2785. [2021-07-13 20:03:16,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2785 states, 2784 states have (on average 3.7819683908045976) internal successors, (10529), 2784 states have internal predecessors, (10529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:16,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2785 states to 2785 states and 10529 transitions. [2021-07-13 20:03:16,316 INFO L78 Accepts]: Start accepts. Automaton has 2785 states and 10529 transitions. Word has length 24 [2021-07-13 20:03:16,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:16,317 INFO L482 AbstractCegarLoop]: Abstraction has 2785 states and 10529 transitions. [2021-07-13 20:03:16,317 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:16,317 INFO L276 IsEmpty]: Start isEmpty. Operand 2785 states and 10529 transitions. [2021-07-13 20:03:16,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:16,320 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:16,321 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:16,521 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable556,295 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:16,521 INFO L430 AbstractCegarLoop]: === Iteration 307 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:16,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:16,521 INFO L82 PathProgramCache]: Analyzing trace with hash -189557394, now seen corresponding path program 174 times [2021-07-13 20:03:16,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:16,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110566847] [2021-07-13 20:03:16,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:16,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:16,700 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:16,700 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:16,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110566847] [2021-07-13 20:03:16,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110566847] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:16,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121474614] [2021-07-13 20:03:16,700 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 296 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 296 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:16,727 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-07-13 20:03:16,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:16,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 28 conjunts are in the unsatisfiable core [2021-07-13 20:03:16,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:16,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:03:16,860 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:16,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 23 treesize of output 57 [2021-07-13 20:03:16,862 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:16,883 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:16,903 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:16,903 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:350 [2021-07-13 20:03:17,181 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:17,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121474614] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:17,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:17,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 20:03:17,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985117317] [2021-07-13 20:03:17,181 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:03:17,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:17,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:03:17,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=473, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:03:17,182 INFO L87 Difference]: Start difference. First operand 2785 states and 10529 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:17,669 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 49 [2021-07-13 20:03:18,723 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 36 [2021-07-13 20:03:19,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:19,631 INFO L93 Difference]: Finished difference Result 3326 states and 12143 transitions. [2021-07-13 20:03:19,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 20:03:19,631 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:19,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:19,639 INFO L225 Difference]: With dead ends: 3326 [2021-07-13 20:03:19,639 INFO L226 Difference]: Without dead ends: 3290 [2021-07-13 20:03:19,639 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 841 ImplicationChecksByTransitivity, 2247.2ms TimeCoverageRelationStatistics Valid=548, Invalid=2644, Unknown=0, NotChecked=0, Total=3192 [2021-07-13 20:03:19,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3290 states. [2021-07-13 20:03:19,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3290 to 2794. [2021-07-13 20:03:19,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2794 states, 2793 states have (on average 3.779090583601862) internal successors, (10555), 2793 states have internal predecessors, (10555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:19,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2794 states to 2794 states and 10555 transitions. [2021-07-13 20:03:19,685 INFO L78 Accepts]: Start accepts. Automaton has 2794 states and 10555 transitions. Word has length 24 [2021-07-13 20:03:19,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:19,685 INFO L482 AbstractCegarLoop]: Abstraction has 2794 states and 10555 transitions. [2021-07-13 20:03:19,685 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:19,685 INFO L276 IsEmpty]: Start isEmpty. Operand 2794 states and 10555 transitions. [2021-07-13 20:03:19,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:19,689 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:19,689 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:19,889 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 296 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable557 [2021-07-13 20:03:19,889 INFO L430 AbstractCegarLoop]: === Iteration 308 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:19,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:19,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1023295834, now seen corresponding path program 175 times [2021-07-13 20:03:19,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:19,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040132477] [2021-07-13 20:03:19,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:19,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:20,070 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:20,071 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:20,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040132477] [2021-07-13 20:03:20,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040132477] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:20,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038264984] [2021-07-13 20:03:20,071 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 297 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 297 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:20,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:20,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:20,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:20,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:20,222 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:20,225 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:20,226 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:20,226 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:03:20,274 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:20,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038264984] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:20,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:20,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:20,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146940521] [2021-07-13 20:03:20,275 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:20,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:20,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:20,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:20,275 INFO L87 Difference]: Start difference. First operand 2794 states and 10555 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:20,537 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 44 [2021-07-13 20:03:21,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:21,809 INFO L93 Difference]: Finished difference Result 3320 states and 12153 transitions. [2021-07-13 20:03:21,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-07-13 20:03:21,809 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:21,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:21,816 INFO L225 Difference]: With dead ends: 3320 [2021-07-13 20:03:21,816 INFO L226 Difference]: Without dead ends: 3296 [2021-07-13 20:03:21,817 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 1256.5ms TimeCoverageRelationStatistics Valid=371, Invalid=2079, Unknown=0, NotChecked=0, Total=2450 [2021-07-13 20:03:21,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3296 states. [2021-07-13 20:03:21,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3296 to 2790. [2021-07-13 20:03:21,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2790 states, 2789 states have (on average 3.779849408390104) internal successors, (10542), 2789 states have internal predecessors, (10542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:21,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2790 states to 2790 states and 10542 transitions. [2021-07-13 20:03:21,858 INFO L78 Accepts]: Start accepts. Automaton has 2790 states and 10542 transitions. Word has length 24 [2021-07-13 20:03:21,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:21,858 INFO L482 AbstractCegarLoop]: Abstraction has 2790 states and 10542 transitions. [2021-07-13 20:03:21,858 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:21,858 INFO L276 IsEmpty]: Start isEmpty. Operand 2790 states and 10542 transitions. [2021-07-13 20:03:21,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:21,862 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:21,862 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:22,063 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 297 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable568 [2021-07-13 20:03:22,063 INFO L430 AbstractCegarLoop]: === Iteration 309 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:22,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:22,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1855921234, now seen corresponding path program 176 times [2021-07-13 20:03:22,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:22,064 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067937731] [2021-07-13 20:03:22,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:22,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:22,229 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:22,229 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:22,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067937731] [2021-07-13 20:03:22,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067937731] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:22,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249352108] [2021-07-13 20:03:22,229 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 298 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 298 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:22,256 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:03:22,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:22,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:03:22,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:22,368 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:22,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:03:22,369 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:22,390 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:22,391 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:22,392 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:03:22,545 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:22,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249352108] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:22,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:22,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:03:22,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070835292] [2021-07-13 20:03:22,546 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:03:22,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:22,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:03:22,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:03:22,546 INFO L87 Difference]: Start difference. First operand 2790 states and 10542 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:22,912 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 49 [2021-07-13 20:03:23,536 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 40 [2021-07-13 20:03:23,915 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 45 [2021-07-13 20:03:24,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:24,603 INFO L93 Difference]: Finished difference Result 3245 states and 11918 transitions. [2021-07-13 20:03:24,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-07-13 20:03:24,604 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:24,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:24,611 INFO L225 Difference]: With dead ends: 3245 [2021-07-13 20:03:24,611 INFO L226 Difference]: Without dead ends: 3219 [2021-07-13 20:03:24,612 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 1726.7ms TimeCoverageRelationStatistics Valid=364, Invalid=1892, Unknown=0, NotChecked=0, Total=2256 [2021-07-13 20:03:24,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3219 states. [2021-07-13 20:03:24,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3219 to 2794. [2021-07-13 20:03:24,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2794 states, 2793 states have (on average 3.778374507697816) internal successors, (10553), 2793 states have internal predecessors, (10553), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:24,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2794 states to 2794 states and 10553 transitions. [2021-07-13 20:03:24,660 INFO L78 Accepts]: Start accepts. Automaton has 2794 states and 10553 transitions. Word has length 24 [2021-07-13 20:03:24,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:24,660 INFO L482 AbstractCegarLoop]: Abstraction has 2794 states and 10553 transitions. [2021-07-13 20:03:24,660 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:24,660 INFO L276 IsEmpty]: Start isEmpty. Operand 2794 states and 10553 transitions. [2021-07-13 20:03:24,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:24,666 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:24,666 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:24,891 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 298 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable569 [2021-07-13 20:03:24,891 INFO L430 AbstractCegarLoop]: === Iteration 310 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:24,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:24,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1532335056, now seen corresponding path program 177 times [2021-07-13 20:03:24,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:24,892 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074814388] [2021-07-13 20:03:24,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:24,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:25,099 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:25,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:25,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074814388] [2021-07-13 20:03:25,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074814388] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:25,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386986834] [2021-07-13 20:03:25,100 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 299 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 299 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:25,135 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:03:25,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:25,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:03:25,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:25,268 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:25,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:03:25,269 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:25,282 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:25,283 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:25,283 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:03:25,469 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:25,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386986834] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:25,469 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:25,469 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:03:25,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29098800] [2021-07-13 20:03:25,470 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:03:25,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:25,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:03:25,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:03:25,470 INFO L87 Difference]: Start difference. First operand 2794 states and 10553 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:25,864 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 49 [2021-07-13 20:03:26,430 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 40 [2021-07-13 20:03:27,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:27,593 INFO L93 Difference]: Finished difference Result 3212 states and 11807 transitions. [2021-07-13 20:03:27,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-07-13 20:03:27,593 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:27,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:27,602 INFO L225 Difference]: With dead ends: 3212 [2021-07-13 20:03:27,602 INFO L226 Difference]: Without dead ends: 3194 [2021-07-13 20:03:27,603 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 1802.1ms TimeCoverageRelationStatistics Valid=338, Invalid=1824, Unknown=0, NotChecked=0, Total=2162 [2021-07-13 20:03:27,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3194 states. [2021-07-13 20:03:27,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3194 to 2797. [2021-07-13 20:03:27,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2797 states, 2796 states have (on average 3.7775393419170245) internal successors, (10562), 2796 states have internal predecessors, (10562), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:27,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2797 states to 2797 states and 10562 transitions. [2021-07-13 20:03:27,687 INFO L78 Accepts]: Start accepts. Automaton has 2797 states and 10562 transitions. Word has length 24 [2021-07-13 20:03:27,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:27,687 INFO L482 AbstractCegarLoop]: Abstraction has 2797 states and 10562 transitions. [2021-07-13 20:03:27,688 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:27,688 INFO L276 IsEmpty]: Start isEmpty. Operand 2797 states and 10562 transitions. [2021-07-13 20:03:27,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:27,693 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:27,693 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:27,912 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable572,299 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:27,913 INFO L430 AbstractCegarLoop]: === Iteration 311 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:27,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:27,913 INFO L82 PathProgramCache]: Analyzing trace with hash 153409066, now seen corresponding path program 178 times [2021-07-13 20:03:27,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:27,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846111423] [2021-07-13 20:03:27,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:27,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:28,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:28,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:28,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846111423] [2021-07-13 20:03:28,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846111423] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:28,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [561540142] [2021-07-13 20:03:28,106 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 300 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 300 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:28,139 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:03:28,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:28,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:28,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:28,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:28,258 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:28,262 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:28,263 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:28,263 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:03:28,329 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:28,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [561540142] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:28,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:28,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:03:28,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780625655] [2021-07-13 20:03:28,330 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:03:28,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:28,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:03:28,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:03:28,331 INFO L87 Difference]: Start difference. First operand 2797 states and 10562 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:28,624 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 38 [2021-07-13 20:03:29,159 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 37 [2021-07-13 20:03:29,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:29,986 INFO L93 Difference]: Finished difference Result 3156 states and 11659 transitions. [2021-07-13 20:03:29,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 20:03:29,987 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:29,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:29,995 INFO L225 Difference]: With dead ends: 3156 [2021-07-13 20:03:29,995 INFO L226 Difference]: Without dead ends: 3139 [2021-07-13 20:03:29,995 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 1364.8ms TimeCoverageRelationStatistics Valid=269, Invalid=1453, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 20:03:29,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3139 states. [2021-07-13 20:03:30,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3139 to 2791. [2021-07-13 20:03:30,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2791 states, 2790 states have (on average 3.7795698924731185) internal successors, (10545), 2790 states have internal predecessors, (10545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:30,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2791 states to 2791 states and 10545 transitions. [2021-07-13 20:03:30,050 INFO L78 Accepts]: Start accepts. Automaton has 2791 states and 10545 transitions. Word has length 24 [2021-07-13 20:03:30,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:30,050 INFO L482 AbstractCegarLoop]: Abstraction has 2791 states and 10545 transitions. [2021-07-13 20:03:30,050 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:30,050 INFO L276 IsEmpty]: Start isEmpty. Operand 2791 states and 10545 transitions. [2021-07-13 20:03:30,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:30,055 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:30,055 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:30,277 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 300 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable575 [2021-07-13 20:03:30,277 INFO L430 AbstractCegarLoop]: === Iteration 312 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:30,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:30,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1558844418, now seen corresponding path program 179 times [2021-07-13 20:03:30,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:30,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375021644] [2021-07-13 20:03:30,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:30,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:30,477 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:30,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:30,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375021644] [2021-07-13 20:03:30,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375021644] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:30,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717940645] [2021-07-13 20:03:30,477 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 301 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 301 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:30,512 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:03:30,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:30,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:30,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:30,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:30,634 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:30,638 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:30,639 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:30,639 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:03:30,709 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:30,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717940645] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:30,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:30,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:30,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546240994] [2021-07-13 20:03:30,709 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:30,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:30,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:30,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:30,710 INFO L87 Difference]: Start difference. First operand 2791 states and 10545 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:31,022 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 38 [2021-07-13 20:03:31,516 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 37 [2021-07-13 20:03:32,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:32,380 INFO L93 Difference]: Finished difference Result 3273 states and 12003 transitions. [2021-07-13 20:03:32,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 20:03:32,381 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:32,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:32,390 INFO L225 Difference]: With dead ends: 3273 [2021-07-13 20:03:32,390 INFO L226 Difference]: Without dead ends: 3247 [2021-07-13 20:03:32,391 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 1330.5ms TimeCoverageRelationStatistics Valid=311, Invalid=1581, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 20:03:32,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3247 states. [2021-07-13 20:03:32,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3247 to 2791. [2021-07-13 20:03:32,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2791 states, 2790 states have (on average 3.7795698924731185) internal successors, (10545), 2790 states have internal predecessors, (10545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:32,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2791 states to 2791 states and 10545 transitions. [2021-07-13 20:03:32,458 INFO L78 Accepts]: Start accepts. Automaton has 2791 states and 10545 transitions. Word has length 24 [2021-07-13 20:03:32,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:32,458 INFO L482 AbstractCegarLoop]: Abstraction has 2791 states and 10545 transitions. [2021-07-13 20:03:32,459 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:32,459 INFO L276 IsEmpty]: Start isEmpty. Operand 2791 states and 10545 transitions. [2021-07-13 20:03:32,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:32,465 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:32,465 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:32,679 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 301 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable576 [2021-07-13 20:03:32,680 INFO L430 AbstractCegarLoop]: === Iteration 313 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:32,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:32,680 INFO L82 PathProgramCache]: Analyzing trace with hash 945261704, now seen corresponding path program 180 times [2021-07-13 20:03:32,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:32,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309731271] [2021-07-13 20:03:32,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:32,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:32,887 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:32,888 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:32,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309731271] [2021-07-13 20:03:32,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309731271] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:32,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120720990] [2021-07-13 20:03:32,888 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 302 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 302 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:32,924 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:03:32,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:32,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:32,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:33,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:33,046 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:33,050 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:33,051 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:33,051 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:03:33,123 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:33,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120720990] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:33,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:33,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:33,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926103] [2021-07-13 20:03:33,124 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:33,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:33,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:33,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:33,124 INFO L87 Difference]: Start difference. First operand 2791 states and 10545 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:33,404 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 38 [2021-07-13 20:03:33,841 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 37 [2021-07-13 20:03:34,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:34,536 INFO L93 Difference]: Finished difference Result 3237 states and 11894 transitions. [2021-07-13 20:03:34,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-07-13 20:03:34,537 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:34,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:34,547 INFO L225 Difference]: With dead ends: 3237 [2021-07-13 20:03:34,547 INFO L226 Difference]: Without dead ends: 3215 [2021-07-13 20:03:34,547 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 1214.9ms TimeCoverageRelationStatistics Valid=303, Invalid=1503, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:03:34,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3215 states. [2021-07-13 20:03:34,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3215 to 2791. [2021-07-13 20:03:34,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2791 states, 2790 states have (on average 3.7795698924731185) internal successors, (10545), 2790 states have internal predecessors, (10545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:34,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2791 states to 2791 states and 10545 transitions. [2021-07-13 20:03:34,610 INFO L78 Accepts]: Start accepts. Automaton has 2791 states and 10545 transitions. Word has length 24 [2021-07-13 20:03:34,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:34,610 INFO L482 AbstractCegarLoop]: Abstraction has 2791 states and 10545 transitions. [2021-07-13 20:03:34,611 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:34,611 INFO L276 IsEmpty]: Start isEmpty. Operand 2791 states and 10545 transitions. [2021-07-13 20:03:34,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:34,668 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:34,668 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:34,869 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 302 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable577 [2021-07-13 20:03:34,869 INFO L430 AbstractCegarLoop]: === Iteration 314 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:34,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:34,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1622816248, now seen corresponding path program 181 times [2021-07-13 20:03:34,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:34,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611935208] [2021-07-13 20:03:34,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:34,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:35,060 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:35,060 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:35,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611935208] [2021-07-13 20:03:35,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611935208] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:35,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595066804] [2021-07-13 20:03:35,061 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 303 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 303 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:35,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:35,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:35,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:35,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:35,197 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:35,201 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:35,201 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:35,201 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:03:35,266 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:35,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595066804] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:35,266 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:35,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:35,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147351553] [2021-07-13 20:03:35,267 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:35,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:35,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:35,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:35,267 INFO L87 Difference]: Start difference. First operand 2791 states and 10545 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:35,567 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 38 [2021-07-13 20:03:35,967 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 37 [2021-07-13 20:03:36,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:36,734 INFO L93 Difference]: Finished difference Result 3213 states and 11832 transitions. [2021-07-13 20:03:36,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 20:03:36,734 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:36,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:36,741 INFO L225 Difference]: With dead ends: 3213 [2021-07-13 20:03:36,741 INFO L226 Difference]: Without dead ends: 3190 [2021-07-13 20:03:36,741 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 1198.3ms TimeCoverageRelationStatistics Valid=309, Invalid=1671, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 20:03:36,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3190 states. [2021-07-13 20:03:36,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3190 to 2793. [2021-07-13 20:03:36,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2793 states, 2792 states have (on average 3.7786532951289398) internal successors, (10550), 2792 states have internal predecessors, (10550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:36,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2793 states to 2793 states and 10550 transitions. [2021-07-13 20:03:36,792 INFO L78 Accepts]: Start accepts. Automaton has 2793 states and 10550 transitions. Word has length 24 [2021-07-13 20:03:36,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:36,792 INFO L482 AbstractCegarLoop]: Abstraction has 2793 states and 10550 transitions. [2021-07-13 20:03:36,793 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:36,793 INFO L276 IsEmpty]: Start isEmpty. Operand 2793 states and 10550 transitions. [2021-07-13 20:03:36,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:36,798 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:36,798 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:37,020 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable578,303 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:37,020 INFO L430 AbstractCegarLoop]: === Iteration 315 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:37,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:37,021 INFO L82 PathProgramCache]: Analyzing trace with hash -643401800, now seen corresponding path program 182 times [2021-07-13 20:03:37,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:37,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201673058] [2021-07-13 20:03:37,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:37,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:37,264 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:37,264 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:37,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201673058] [2021-07-13 20:03:37,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201673058] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:37,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611939700] [2021-07-13 20:03:37,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 304 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 304 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:37,298 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:03:37,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:37,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:37,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:37,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:37,414 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:37,418 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:37,418 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:37,419 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:03:37,493 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:37,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611939700] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:37,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:37,493 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:37,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006921187] [2021-07-13 20:03:37,493 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:37,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:37,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:37,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:37,494 INFO L87 Difference]: Start difference. First operand 2793 states and 10550 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:38,121 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 37 [2021-07-13 20:03:38,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:38,678 INFO L93 Difference]: Finished difference Result 3218 states and 11844 transitions. [2021-07-13 20:03:38,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 20:03:38,678 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:38,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:38,685 INFO L225 Difference]: With dead ends: 3218 [2021-07-13 20:03:38,685 INFO L226 Difference]: Without dead ends: 3196 [2021-07-13 20:03:38,685 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 1088.1ms TimeCoverageRelationStatistics Valid=317, Invalid=1663, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 20:03:38,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3196 states. [2021-07-13 20:03:38,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3196 to 2790. [2021-07-13 20:03:38,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2790 states, 2789 states have (on average 3.779849408390104) internal successors, (10542), 2789 states have internal predecessors, (10542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:38,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2790 states to 2790 states and 10542 transitions. [2021-07-13 20:03:38,728 INFO L78 Accepts]: Start accepts. Automaton has 2790 states and 10542 transitions. Word has length 24 [2021-07-13 20:03:38,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:38,728 INFO L482 AbstractCegarLoop]: Abstraction has 2790 states and 10542 transitions. [2021-07-13 20:03:38,728 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:38,728 INFO L276 IsEmpty]: Start isEmpty. Operand 2790 states and 10542 transitions. [2021-07-13 20:03:38,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:38,732 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:38,732 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:38,933 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 304 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable579 [2021-07-13 20:03:38,933 INFO L430 AbstractCegarLoop]: === Iteration 316 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:38,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:38,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1889346820, now seen corresponding path program 99 times [2021-07-13 20:03:38,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:38,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790820558] [2021-07-13 20:03:38,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:38,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:39,110 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:39,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:39,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790820558] [2021-07-13 20:03:39,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790820558] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:39,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1612598602] [2021-07-13 20:03:39,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 305 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 305 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:39,140 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:03:39,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:39,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:03:39,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:39,277 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:39,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:03:39,279 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:39,289 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:39,290 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:39,290 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:03:39,390 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:39,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1612598602] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:39,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:39,390 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:03:39,390 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665451869] [2021-07-13 20:03:39,390 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:03:39,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:39,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:03:39,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:03:39,391 INFO L87 Difference]: Start difference. First operand 2790 states and 10542 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:39,902 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 37 [2021-07-13 20:03:40,189 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 37 [2021-07-13 20:03:42,858 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 37 [2021-07-13 20:03:43,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:43,461 INFO L93 Difference]: Finished difference Result 4181 states and 14688 transitions. [2021-07-13 20:03:43,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-07-13 20:03:43,461 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:43,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:43,469 INFO L225 Difference]: With dead ends: 4181 [2021-07-13 20:03:43,470 INFO L226 Difference]: Without dead ends: 4131 [2021-07-13 20:03:43,470 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2712 ImplicationChecksByTransitivity, 3595.9ms TimeCoverageRelationStatistics Valid=1278, Invalid=6378, Unknown=0, NotChecked=0, Total=7656 [2021-07-13 20:03:43,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4131 states. [2021-07-13 20:03:43,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4131 to 2834. [2021-07-13 20:03:43,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2834 states, 2833 states have (on average 3.7871514295799504) internal successors, (10729), 2833 states have internal predecessors, (10729), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:43,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2834 states to 2834 states and 10729 transitions. [2021-07-13 20:03:43,521 INFO L78 Accepts]: Start accepts. Automaton has 2834 states and 10729 transitions. Word has length 24 [2021-07-13 20:03:43,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:43,521 INFO L482 AbstractCegarLoop]: Abstraction has 2834 states and 10729 transitions. [2021-07-13 20:03:43,521 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:43,521 INFO L276 IsEmpty]: Start isEmpty. Operand 2834 states and 10729 transitions. [2021-07-13 20:03:43,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:43,525 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:43,525 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:43,725 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable580,305 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:43,726 INFO L430 AbstractCegarLoop]: === Iteration 317 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:43,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:43,726 INFO L82 PathProgramCache]: Analyzing trace with hash 98485646, now seen corresponding path program 100 times [2021-07-13 20:03:43,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:43,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657261416] [2021-07-13 20:03:43,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:43,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:43,928 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:43,928 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:43,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657261416] [2021-07-13 20:03:43,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657261416] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:43,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354207422] [2021-07-13 20:03:43,929 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 306 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 306 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:43,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:03:43,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:43,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:43,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:44,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:44,076 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:44,079 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:44,079 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:44,079 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:03:44,127 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:44,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354207422] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:44,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:44,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:44,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011462036] [2021-07-13 20:03:44,128 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:44,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:44,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:44,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:44,128 INFO L87 Difference]: Start difference. First operand 2834 states and 10729 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:46,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:46,759 INFO L93 Difference]: Finished difference Result 3970 states and 14222 transitions. [2021-07-13 20:03:46,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-07-13 20:03:46,760 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:46,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:46,768 INFO L225 Difference]: With dead ends: 3970 [2021-07-13 20:03:46,768 INFO L226 Difference]: Without dead ends: 3948 [2021-07-13 20:03:46,769 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1996 ImplicationChecksByTransitivity, 2318.2ms TimeCoverageRelationStatistics Valid=1020, Invalid=4832, Unknown=0, NotChecked=0, Total=5852 [2021-07-13 20:03:46,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3948 states. [2021-07-13 20:03:46,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3948 to 2862. [2021-07-13 20:03:46,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2862 states, 2861 states have (on average 3.788885005242922) internal successors, (10840), 2861 states have internal predecessors, (10840), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:46,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2862 states to 2862 states and 10840 transitions. [2021-07-13 20:03:46,818 INFO L78 Accepts]: Start accepts. Automaton has 2862 states and 10840 transitions. Word has length 24 [2021-07-13 20:03:46,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:46,819 INFO L482 AbstractCegarLoop]: Abstraction has 2862 states and 10840 transitions. [2021-07-13 20:03:46,819 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:46,819 INFO L276 IsEmpty]: Start isEmpty. Operand 2862 states and 10840 transitions. [2021-07-13 20:03:46,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:46,823 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:46,823 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:47,023 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable583,306 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:47,023 INFO L430 AbstractCegarLoop]: === Iteration 318 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:47,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:47,024 INFO L82 PathProgramCache]: Analyzing trace with hash -168148038, now seen corresponding path program 183 times [2021-07-13 20:03:47,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:47,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590514534] [2021-07-13 20:03:47,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:47,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:47,194 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:47,195 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:47,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590514534] [2021-07-13 20:03:47,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590514534] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:47,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494063770] [2021-07-13 20:03:47,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 307 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 307 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:47,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:03:47,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:47,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 20:03:47,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:47,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:03:47,372 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:47,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 23 treesize of output 57 [2021-07-13 20:03:47,375 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:47,395 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:47,396 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:47,396 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:54 [2021-07-13 20:03:47,606 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:47,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494063770] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:47,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:47,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 20:03:47,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982076719] [2021-07-13 20:03:47,607 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:03:47,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:47,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:03:47,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:03:47,607 INFO L87 Difference]: Start difference. First operand 2862 states and 10840 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:48,176 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 40 [2021-07-13 20:03:50,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:50,397 INFO L93 Difference]: Finished difference Result 3928 states and 14042 transitions. [2021-07-13 20:03:50,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-07-13 20:03:50,397 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:50,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:50,405 INFO L225 Difference]: With dead ends: 3928 [2021-07-13 20:03:50,405 INFO L226 Difference]: Without dead ends: 3896 [2021-07-13 20:03:50,405 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1578 ImplicationChecksByTransitivity, 2519.4ms TimeCoverageRelationStatistics Valid=723, Invalid=4247, Unknown=0, NotChecked=0, Total=4970 [2021-07-13 20:03:50,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3896 states. [2021-07-13 20:03:50,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3896 to 2879. [2021-07-13 20:03:50,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2879 states, 2878 states have (on average 3.791174426685198) internal successors, (10911), 2878 states have internal predecessors, (10911), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:50,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2879 states to 2879 states and 10911 transitions. [2021-07-13 20:03:50,455 INFO L78 Accepts]: Start accepts. Automaton has 2879 states and 10911 transitions. Word has length 24 [2021-07-13 20:03:50,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:50,455 INFO L482 AbstractCegarLoop]: Abstraction has 2879 states and 10911 transitions. [2021-07-13 20:03:50,455 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:50,455 INFO L276 IsEmpty]: Start isEmpty. Operand 2879 states and 10911 transitions. [2021-07-13 20:03:50,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:50,461 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:50,461 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:50,686 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 307 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable584 [2021-07-13 20:03:50,686 INFO L430 AbstractCegarLoop]: === Iteration 319 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:50,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:50,687 INFO L82 PathProgramCache]: Analyzing trace with hash 155438140, now seen corresponding path program 184 times [2021-07-13 20:03:50,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:50,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808501348] [2021-07-13 20:03:50,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:50,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:50,860 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:50,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:50,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808501348] [2021-07-13 20:03:50,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808501348] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:50,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941167859] [2021-07-13 20:03:50,861 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 308 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 308 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:50,889 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:03:50,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:50,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:50,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:51,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:03:51,014 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:51,017 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:51,017 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:51,017 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:03:51,066 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:51,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941167859] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:51,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:51,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:51,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95730910] [2021-07-13 20:03:51,066 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:51,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:51,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:51,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:51,067 INFO L87 Difference]: Start difference. First operand 2879 states and 10911 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:53,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:53,840 INFO L93 Difference]: Finished difference Result 3884 states and 13980 transitions. [2021-07-13 20:03:53,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-07-13 20:03:53,840 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:53,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:53,848 INFO L225 Difference]: With dead ends: 3884 [2021-07-13 20:03:53,848 INFO L226 Difference]: Without dead ends: 3862 [2021-07-13 20:03:53,849 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2140 ImplicationChecksByTransitivity, 2447.6ms TimeCoverageRelationStatistics Valid=973, Invalid=5189, Unknown=0, NotChecked=0, Total=6162 [2021-07-13 20:03:53,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3862 states. [2021-07-13 20:03:53,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3862 to 2881. [2021-07-13 20:03:53,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2881 states, 2880 states have (on average 3.790277777777778) internal successors, (10916), 2880 states have internal predecessors, (10916), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:53,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2881 states to 2881 states and 10916 transitions. [2021-07-13 20:03:53,897 INFO L78 Accepts]: Start accepts. Automaton has 2881 states and 10916 transitions. Word has length 24 [2021-07-13 20:03:53,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:53,898 INFO L482 AbstractCegarLoop]: Abstraction has 2881 states and 10916 transitions. [2021-07-13 20:03:53,898 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:53,898 INFO L276 IsEmpty]: Start isEmpty. Operand 2881 states and 10916 transitions. [2021-07-13 20:03:53,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:53,902 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:53,902 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:54,102 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 308 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable596 [2021-07-13 20:03:54,102 INFO L430 AbstractCegarLoop]: === Iteration 320 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:54,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:54,102 INFO L82 PathProgramCache]: Analyzing trace with hash 692360808, now seen corresponding path program 101 times [2021-07-13 20:03:54,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:54,103 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412198559] [2021-07-13 20:03:54,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:54,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:54,289 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:54,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:54,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412198559] [2021-07-13 20:03:54,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1412198559] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:54,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399312742] [2021-07-13 20:03:54,289 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 309 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 309 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:54,316 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:03:54,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:54,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:54,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:54,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:03:54,449 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:54,450 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:54,451 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:54,451 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:03:54,486 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:54,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399312742] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:54,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:54,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:54,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616168343] [2021-07-13 20:03:54,486 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:54,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:54,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:54,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:54,487 INFO L87 Difference]: Start difference. First operand 2881 states and 10916 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:57,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:03:57,078 INFO L93 Difference]: Finished difference Result 4390 states and 15566 transitions. [2021-07-13 20:03:57,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-07-13 20:03:57,079 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:03:57,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:03:57,088 INFO L225 Difference]: With dead ends: 4390 [2021-07-13 20:03:57,088 INFO L226 Difference]: Without dead ends: 4345 [2021-07-13 20:03:57,088 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1815 ImplicationChecksByTransitivity, 2212.6ms TimeCoverageRelationStatistics Valid=1003, Invalid=4399, Unknown=0, NotChecked=0, Total=5402 [2021-07-13 20:03:57,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4345 states. [2021-07-13 20:03:57,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4345 to 3010. [2021-07-13 20:03:57,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3010 states, 3009 states have (on average 3.8062479228979726) internal successors, (11453), 3009 states have internal predecessors, (11453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:57,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3010 states to 3010 states and 11453 transitions. [2021-07-13 20:03:57,157 INFO L78 Accepts]: Start accepts. Automaton has 3010 states and 11453 transitions. Word has length 24 [2021-07-13 20:03:57,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:03:57,158 INFO L482 AbstractCegarLoop]: Abstraction has 3010 states and 11453 transitions. [2021-07-13 20:03:57,158 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:03:57,158 INFO L276 IsEmpty]: Start isEmpty. Operand 3010 states and 11453 transitions. [2021-07-13 20:03:57,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:03:57,163 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:03:57,163 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:03:57,387 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 309 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable597 [2021-07-13 20:03:57,387 INFO L430 AbstractCegarLoop]: === Iteration 321 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:03:57,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:03:57,387 INFO L82 PathProgramCache]: Analyzing trace with hash 487442674, now seen corresponding path program 185 times [2021-07-13 20:03:57,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:03:57,388 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012762466] [2021-07-13 20:03:57,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:03:57,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:03:57,581 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:57,581 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:03:57,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012762466] [2021-07-13 20:03:57,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012762466] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:57,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119346836] [2021-07-13 20:03:57,581 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 310 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 310 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:03:57,611 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:03:57,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:03:57,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:03:57,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:03:57,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:03:57,745 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:03:57,746 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:03:57,747 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:03:57,747 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:03:57,781 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:03:57,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1119346836] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:03:57,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:03:57,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:03:57,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559148686] [2021-07-13 20:03:57,782 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:03:57,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:03:57,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:03:57,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:03:57,782 INFO L87 Difference]: Start difference. First operand 3010 states and 11453 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:00,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:00,755 INFO L93 Difference]: Finished difference Result 4523 states and 16142 transitions. [2021-07-13 20:04:00,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-07-13 20:04:00,755 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:00,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:00,764 INFO L225 Difference]: With dead ends: 4523 [2021-07-13 20:04:00,765 INFO L226 Difference]: Without dead ends: 4469 [2021-07-13 20:04:00,765 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1903 ImplicationChecksByTransitivity, 2409.7ms TimeCoverageRelationStatistics Valid=1011, Invalid=4539, Unknown=0, NotChecked=0, Total=5550 [2021-07-13 20:04:00,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4469 states. [2021-07-13 20:04:00,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4469 to 3113. [2021-07-13 20:04:00,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3113 states, 3112 states have (on average 3.8251928020565553) internal successors, (11904), 3112 states have internal predecessors, (11904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:00,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3113 states to 3113 states and 11904 transitions. [2021-07-13 20:04:00,821 INFO L78 Accepts]: Start accepts. Automaton has 3113 states and 11904 transitions. Word has length 24 [2021-07-13 20:04:00,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:00,821 INFO L482 AbstractCegarLoop]: Abstraction has 3113 states and 11904 transitions. [2021-07-13 20:04:00,821 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:00,821 INFO L276 IsEmpty]: Start isEmpty. Operand 3113 states and 11904 transitions. [2021-07-13 20:04:00,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:00,826 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:00,826 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:01,026 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 310 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable598 [2021-07-13 20:04:01,026 INFO L430 AbstractCegarLoop]: === Iteration 322 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:01,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:01,027 INFO L82 PathProgramCache]: Analyzing trace with hash -380303656, now seen corresponding path program 186 times [2021-07-13 20:04:01,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:01,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410370857] [2021-07-13 20:04:01,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:01,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:01,191 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:01,191 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:01,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410370857] [2021-07-13 20:04:01,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410370857] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:01,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854066214] [2021-07-13 20:04:01,191 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 311 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 311 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:01,239 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:04:01,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:01,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:04:01,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:01,388 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:01,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:04:01,390 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:01,404 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:01,405 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:01,405 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:04:01,527 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:01,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [854066214] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:01,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:01,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:04:01,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858322482] [2021-07-13 20:04:01,528 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:04:01,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:01,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:04:01,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:04:01,528 INFO L87 Difference]: Start difference. First operand 3113 states and 11904 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:01,963 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 37 [2021-07-13 20:04:03,898 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 33 [2021-07-13 20:04:04,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:04,405 INFO L93 Difference]: Finished difference Result 4045 states and 14733 transitions. [2021-07-13 20:04:04,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-07-13 20:04:04,405 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:04,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:04,417 INFO L225 Difference]: With dead ends: 4045 [2021-07-13 20:04:04,417 INFO L226 Difference]: Without dead ends: 4036 [2021-07-13 20:04:04,418 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1307 ImplicationChecksByTransitivity, 2376.5ms TimeCoverageRelationStatistics Valid=622, Invalid=3538, Unknown=0, NotChecked=0, Total=4160 [2021-07-13 20:04:04,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4036 states. [2021-07-13 20:04:04,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4036 to 3118. [2021-07-13 20:04:04,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3118 states, 3117 states have (on average 3.8248315688161694) internal successors, (11922), 3117 states have internal predecessors, (11922), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:04,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3118 states to 3118 states and 11922 transitions. [2021-07-13 20:04:04,491 INFO L78 Accepts]: Start accepts. Automaton has 3118 states and 11922 transitions. Word has length 24 [2021-07-13 20:04:04,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:04,491 INFO L482 AbstractCegarLoop]: Abstraction has 3118 states and 11922 transitions. [2021-07-13 20:04:04,491 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:04,491 INFO L276 IsEmpty]: Start isEmpty. Operand 3118 states and 11922 transitions. [2021-07-13 20:04:04,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:04,498 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:04,498 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:04,715 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable599,311 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:04,715 INFO L430 AbstractCegarLoop]: === Iteration 323 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:04,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:04,716 INFO L82 PathProgramCache]: Analyzing trace with hash -56717478, now seen corresponding path program 187 times [2021-07-13 20:04:04,716 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:04,716 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688840077] [2021-07-13 20:04:04,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:04,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:04,913 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:04,913 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:04,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688840077] [2021-07-13 20:04:04,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688840077] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:04,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318530397] [2021-07-13 20:04:04,913 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 312 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 312 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:04,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:04,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:04,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:05,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:04:05,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:05,076 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:05,076 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:05,076 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:04:05,148 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:05,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318530397] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:05,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:05,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:04:05,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314319408] [2021-07-13 20:04:05,149 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:04:05,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:05,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:04:05,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:04:05,150 INFO L87 Difference]: Start difference. First operand 3118 states and 11922 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:05,653 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 37 [2021-07-13 20:04:06,365 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 39 [2021-07-13 20:04:06,872 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 33 [2021-07-13 20:04:07,750 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 38 [2021-07-13 20:04:07,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:07,890 INFO L93 Difference]: Finished difference Result 4078 states and 14822 transitions. [2021-07-13 20:04:07,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-07-13 20:04:07,890 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:07,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:07,899 INFO L225 Difference]: With dead ends: 4078 [2021-07-13 20:04:07,899 INFO L226 Difference]: Without dead ends: 4045 [2021-07-13 20:04:07,900 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 2321.4ms TimeCoverageRelationStatistics Valid=633, Invalid=3273, Unknown=0, NotChecked=0, Total=3906 [2021-07-13 20:04:07,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4045 states. [2021-07-13 20:04:07,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4045 to 3135. [2021-07-13 20:04:07,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3135 states, 3134 states have (on average 3.829929802169751) internal successors, (12003), 3134 states have internal predecessors, (12003), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:07,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3135 states to 3135 states and 12003 transitions. [2021-07-13 20:04:07,979 INFO L78 Accepts]: Start accepts. Automaton has 3135 states and 12003 transitions. Word has length 24 [2021-07-13 20:04:07,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:07,979 INFO L482 AbstractCegarLoop]: Abstraction has 3135 states and 12003 transitions. [2021-07-13 20:04:07,979 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:07,979 INFO L276 IsEmpty]: Start isEmpty. Operand 3135 states and 12003 transitions. [2021-07-13 20:04:07,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:07,986 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:07,987 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:08,205 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 312 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable601 [2021-07-13 20:04:08,205 INFO L430 AbstractCegarLoop]: === Iteration 324 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:08,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:08,206 INFO L82 PathProgramCache]: Analyzing trace with hash -83226840, now seen corresponding path program 188 times [2021-07-13 20:04:08,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:08,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494126746] [2021-07-13 20:04:08,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:08,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:08,408 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:08,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:08,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494126746] [2021-07-13 20:04:08,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494126746] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:08,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41436640] [2021-07-13 20:04:08,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 313 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 313 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:08,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:04:08,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:08,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:04:08,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:08,587 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:08,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:04:08,589 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:08,602 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:08,603 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:08,603 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:04:08,733 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:08,733 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41436640] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:08,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:08,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:04:08,734 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871531782] [2021-07-13 20:04:08,734 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:04:08,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:08,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:04:08,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:04:08,734 INFO L87 Difference]: Start difference. First operand 3135 states and 12003 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:08,962 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 31 [2021-07-13 20:04:09,333 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 37 [2021-07-13 20:04:11,652 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 33 [2021-07-13 20:04:12,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:12,933 INFO L93 Difference]: Finished difference Result 4435 states and 15824 transitions. [2021-07-13 20:04:12,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-07-13 20:04:12,933 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:12,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:12,945 INFO L225 Difference]: With dead ends: 4435 [2021-07-13 20:04:12,945 INFO L226 Difference]: Without dead ends: 4417 [2021-07-13 20:04:12,946 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2110 ImplicationChecksByTransitivity, 3219.8ms TimeCoverageRelationStatistics Valid=869, Invalid=5451, Unknown=0, NotChecked=0, Total=6320 [2021-07-13 20:04:12,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4417 states. [2021-07-13 20:04:13,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4417 to 3143. [2021-07-13 20:04:13,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3143 states, 3142 states have (on average 3.8309993634627624) internal successors, (12037), 3142 states have internal predecessors, (12037), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:13,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3143 states to 3143 states and 12037 transitions. [2021-07-13 20:04:13,024 INFO L78 Accepts]: Start accepts. Automaton has 3143 states and 12037 transitions. Word has length 24 [2021-07-13 20:04:13,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:13,024 INFO L482 AbstractCegarLoop]: Abstraction has 3143 states and 12037 transitions. [2021-07-13 20:04:13,024 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:13,024 INFO L276 IsEmpty]: Start isEmpty. Operand 3143 states and 12037 transitions. [2021-07-13 20:04:13,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:13,031 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:13,031 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:13,255 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 313 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable602 [2021-07-13 20:04:13,256 INFO L430 AbstractCegarLoop]: === Iteration 325 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:13,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:13,256 INFO L82 PathProgramCache]: Analyzing trace with hash -1874088014, now seen corresponding path program 189 times [2021-07-13 20:04:13,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:13,256 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631613372] [2021-07-13 20:04:13,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:13,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:13,475 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:13,476 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:13,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631613372] [2021-07-13 20:04:13,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631613372] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:13,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214828528] [2021-07-13 20:04:13,476 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 314 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 314 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:13,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:04:13,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:13,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:04:13,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:13,655 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:13,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:04:13,657 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:13,670 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:13,671 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:13,671 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:04:13,817 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:13,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214828528] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:13,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:13,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:04:13,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145546872] [2021-07-13 20:04:13,818 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:04:13,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:13,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:04:13,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=417, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:04:13,818 INFO L87 Difference]: Start difference. First operand 3143 states and 12037 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:14,282 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 48 [2021-07-13 20:04:14,616 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 40 [2021-07-13 20:04:16,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:16,844 INFO L93 Difference]: Finished difference Result 4105 states and 14910 transitions. [2021-07-13 20:04:16,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-07-13 20:04:16,845 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:16,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:16,853 INFO L225 Difference]: With dead ends: 4105 [2021-07-13 20:04:16,853 INFO L226 Difference]: Without dead ends: 4086 [2021-07-13 20:04:16,854 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2080 ImplicationChecksByTransitivity, 2533.2ms TimeCoverageRelationStatistics Valid=889, Invalid=4963, Unknown=0, NotChecked=0, Total=5852 [2021-07-13 20:04:16,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4086 states. [2021-07-13 20:04:16,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4086 to 3144. [2021-07-13 20:04:16,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3144 states, 3143 states have (on average 3.8307349665924275) internal successors, (12040), 3143 states have internal predecessors, (12040), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:16,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3144 states to 3144 states and 12040 transitions. [2021-07-13 20:04:16,904 INFO L78 Accepts]: Start accepts. Automaton has 3144 states and 12040 transitions. Word has length 24 [2021-07-13 20:04:16,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:16,904 INFO L482 AbstractCegarLoop]: Abstraction has 3144 states and 12040 transitions. [2021-07-13 20:04:16,904 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:16,904 INFO L276 IsEmpty]: Start isEmpty. Operand 3144 states and 12040 transitions. [2021-07-13 20:04:16,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:16,908 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:16,909 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:17,109 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 314 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable604 [2021-07-13 20:04:17,109 INFO L430 AbstractCegarLoop]: === Iteration 326 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:17,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:17,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1092254214, now seen corresponding path program 190 times [2021-07-13 20:04:17,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:17,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723983672] [2021-07-13 20:04:17,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:17,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:17,309 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:17,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:17,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723983672] [2021-07-13 20:04:17,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1723983672] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:17,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498050787] [2021-07-13 20:04:17,310 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 315 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 315 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:17,344 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:04:17,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:17,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:17,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:17,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:04:17,473 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:17,478 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:17,478 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:17,478 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:04:17,549 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:17,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498050787] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:17,549 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:17,550 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:04:17,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081790223] [2021-07-13 20:04:17,550 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:04:17,550 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:17,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:04:17,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:04:17,550 INFO L87 Difference]: Start difference. First operand 3144 states and 12040 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:17,932 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 37 [2021-07-13 20:04:19,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:19,582 INFO L93 Difference]: Finished difference Result 3824 states and 14104 transitions. [2021-07-13 20:04:19,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-07-13 20:04:19,583 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:19,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:19,591 INFO L225 Difference]: With dead ends: 3824 [2021-07-13 20:04:19,591 INFO L226 Difference]: Without dead ends: 3811 [2021-07-13 20:04:19,591 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 1770.9ms TimeCoverageRelationStatistics Valid=633, Invalid=3527, Unknown=0, NotChecked=0, Total=4160 [2021-07-13 20:04:19,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3811 states. [2021-07-13 20:04:19,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3811 to 3155. [2021-07-13 20:04:19,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3155 states, 3154 states have (on average 3.8332276474318325) internal successors, (12090), 3154 states have internal predecessors, (12090), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:19,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3155 states to 3155 states and 12090 transitions. [2021-07-13 20:04:19,644 INFO L78 Accepts]: Start accepts. Automaton has 3155 states and 12090 transitions. Word has length 24 [2021-07-13 20:04:19,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:19,644 INFO L482 AbstractCegarLoop]: Abstraction has 3155 states and 12090 transitions. [2021-07-13 20:04:19,644 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:19,644 INFO L276 IsEmpty]: Start isEmpty. Operand 3155 states and 12090 transitions. [2021-07-13 20:04:19,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:19,650 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:19,650 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:19,850 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable607,315 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:19,850 INFO L430 AbstractCegarLoop]: === Iteration 327 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:19,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:19,851 INFO L82 PathProgramCache]: Analyzing trace with hash -147198670, now seen corresponding path program 191 times [2021-07-13 20:04:19,851 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:19,851 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133667798] [2021-07-13 20:04:19,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:19,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:20,017 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:20,017 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:20,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133667798] [2021-07-13 20:04:20,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133667798] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:20,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413837383] [2021-07-13 20:04:20,018 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 316 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 316 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:20,045 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:04:20,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:20,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:20,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:20,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:04:20,156 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:20,160 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:20,161 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:20,161 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:04:20,234 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:20,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413837383] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:20,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:20,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:04:20,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074191157] [2021-07-13 20:04:20,234 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:04:20,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:20,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:04:20,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:04:20,235 INFO L87 Difference]: Start difference. First operand 3155 states and 12090 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:20,608 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 37 [2021-07-13 20:04:21,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:21,969 INFO L93 Difference]: Finished difference Result 3946 states and 14542 transitions. [2021-07-13 20:04:21,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 20:04:21,969 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:21,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:21,978 INFO L225 Difference]: With dead ends: 3946 [2021-07-13 20:04:21,978 INFO L226 Difference]: Without dead ends: 3935 [2021-07-13 20:04:21,979 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 875 ImplicationChecksByTransitivity, 1443.3ms TimeCoverageRelationStatistics Valid=476, Invalid=2386, Unknown=0, NotChecked=0, Total=2862 [2021-07-13 20:04:21,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3935 states. [2021-07-13 20:04:22,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3935 to 3159. [2021-07-13 20:04:22,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3159 states, 3158 states have (on average 3.8331222292590246) internal successors, (12105), 3158 states have internal predecessors, (12105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:22,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3159 states to 3159 states and 12105 transitions. [2021-07-13 20:04:22,037 INFO L78 Accepts]: Start accepts. Automaton has 3159 states and 12105 transitions. Word has length 24 [2021-07-13 20:04:22,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:22,037 INFO L482 AbstractCegarLoop]: Abstraction has 3159 states and 12105 transitions. [2021-07-13 20:04:22,037 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:22,037 INFO L276 IsEmpty]: Start isEmpty. Operand 3159 states and 12105 transitions. [2021-07-13 20:04:22,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:22,042 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:22,043 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:22,243 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable608,316 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:22,243 INFO L430 AbstractCegarLoop]: === Iteration 328 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:22,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:22,244 INFO L82 PathProgramCache]: Analyzing trace with hash 832215778, now seen corresponding path program 192 times [2021-07-13 20:04:22,244 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:22,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360272714] [2021-07-13 20:04:22,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:22,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:22,411 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:22,411 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:22,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360272714] [2021-07-13 20:04:22,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360272714] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:22,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344786514] [2021-07-13 20:04:22,412 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 317 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 317 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:22,441 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:04:22,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:22,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:04:22,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:22,560 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:22,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:04:22,561 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:22,572 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:22,573 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:22,573 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:04:22,701 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:22,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344786514] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:22,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:22,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:04:22,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730497546] [2021-07-13 20:04:22,702 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:04:22,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:22,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:04:22,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:04:22,702 INFO L87 Difference]: Start difference. First operand 3159 states and 12105 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:23,115 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-07-13 20:04:23,411 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 40 [2021-07-13 20:04:25,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:25,228 INFO L93 Difference]: Finished difference Result 3997 states and 14609 transitions. [2021-07-13 20:04:25,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-07-13 20:04:25,228 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:25,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:25,236 INFO L225 Difference]: With dead ends: 3997 [2021-07-13 20:04:25,236 INFO L226 Difference]: Without dead ends: 3979 [2021-07-13 20:04:25,237 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1576 ImplicationChecksByTransitivity, 2194.2ms TimeCoverageRelationStatistics Valid=726, Invalid=3966, Unknown=0, NotChecked=0, Total=4692 [2021-07-13 20:04:25,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3979 states. [2021-07-13 20:04:25,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3979 to 3159. [2021-07-13 20:04:25,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3159 states, 3158 states have (on average 3.8331222292590246) internal successors, (12105), 3158 states have internal predecessors, (12105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:25,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3159 states to 3159 states and 12105 transitions. [2021-07-13 20:04:25,290 INFO L78 Accepts]: Start accepts. Automaton has 3159 states and 12105 transitions. Word has length 24 [2021-07-13 20:04:25,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:25,290 INFO L482 AbstractCegarLoop]: Abstraction has 3159 states and 12105 transitions. [2021-07-13 20:04:25,290 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:25,291 INFO L276 IsEmpty]: Start isEmpty. Operand 3159 states and 12105 transitions. [2021-07-13 20:04:25,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:25,297 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:25,297 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:25,499 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable609,317 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:25,499 INFO L430 AbstractCegarLoop]: === Iteration 329 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:25,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:25,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1741961320, now seen corresponding path program 193 times [2021-07-13 20:04:25,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:25,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141802342] [2021-07-13 20:04:25,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:25,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:25,677 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:25,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:25,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141802342] [2021-07-13 20:04:25,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141802342] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:25,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56839188] [2021-07-13 20:04:25,678 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 318 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 318 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:25,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:25,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:25,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:25,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:04:25,814 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:25,818 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:25,818 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:25,818 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:10 [2021-07-13 20:04:25,879 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:25,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56839188] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:25,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:25,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:04:25,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883805638] [2021-07-13 20:04:25,880 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:04:25,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:25,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:04:25,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:04:25,880 INFO L87 Difference]: Start difference. First operand 3159 states and 12105 transitions. Second operand has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:26,222 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 37 [2021-07-13 20:04:27,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:27,424 INFO L93 Difference]: Finished difference Result 3790 states and 14033 transitions. [2021-07-13 20:04:27,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-07-13 20:04:27,424 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:27,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:27,433 INFO L225 Difference]: With dead ends: 3790 [2021-07-13 20:04:27,433 INFO L226 Difference]: Without dead ends: 3779 [2021-07-13 20:04:27,434 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 1317.5ms TimeCoverageRelationStatistics Valid=476, Invalid=2494, Unknown=0, NotChecked=0, Total=2970 [2021-07-13 20:04:27,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3779 states. [2021-07-13 20:04:27,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3779 to 3156. [2021-07-13 20:04:27,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3156 states, 3155 states have (on average 3.8339144215530903) internal successors, (12096), 3155 states have internal predecessors, (12096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:27,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3156 states to 3156 states and 12096 transitions. [2021-07-13 20:04:27,515 INFO L78 Accepts]: Start accepts. Automaton has 3156 states and 12096 transitions. Word has length 24 [2021-07-13 20:04:27,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:27,515 INFO L482 AbstractCegarLoop]: Abstraction has 3156 states and 12096 transitions. [2021-07-13 20:04:27,515 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:27,515 INFO L276 IsEmpty]: Start isEmpty. Operand 3156 states and 12096 transitions. [2021-07-13 20:04:27,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:27,521 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:27,521 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:27,724 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 318 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable612 [2021-07-13 20:04:27,725 INFO L430 AbstractCegarLoop]: === Iteration 330 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:27,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:27,725 INFO L82 PathProgramCache]: Analyzing trace with hash -792728518, now seen corresponding path program 102 times [2021-07-13 20:04:27,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:27,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413015053] [2021-07-13 20:04:27,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:27,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:27,900 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:27,900 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:27,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413015053] [2021-07-13 20:04:27,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413015053] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:27,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634044483] [2021-07-13 20:04:27,900 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 319 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 319 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:27,927 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:04:27,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:27,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:04:27,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:28,070 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:28,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:04:28,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:28,084 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:28,085 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:28,085 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:04:28,156 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:28,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634044483] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:28,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:28,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:04:28,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158827307] [2021-07-13 20:04:28,157 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:04:28,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:28,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:04:28,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:04:28,157 INFO L87 Difference]: Start difference. First operand 3156 states and 12096 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:31,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:31,620 INFO L93 Difference]: Finished difference Result 4497 states and 16284 transitions. [2021-07-13 20:04:31,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-07-13 20:04:31,621 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:31,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:31,632 INFO L225 Difference]: With dead ends: 4497 [2021-07-13 20:04:31,632 INFO L226 Difference]: Without dead ends: 4464 [2021-07-13 20:04:31,633 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2509 ImplicationChecksByTransitivity, 2953.7ms TimeCoverageRelationStatistics Valid=1071, Invalid=6069, Unknown=0, NotChecked=0, Total=7140 [2021-07-13 20:04:31,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4464 states. [2021-07-13 20:04:31,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4464 to 3272. [2021-07-13 20:04:31,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3272 states, 3271 states have (on average 3.8514215836135737) internal successors, (12598), 3271 states have internal predecessors, (12598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:31,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3272 states to 3272 states and 12598 transitions. [2021-07-13 20:04:31,695 INFO L78 Accepts]: Start accepts. Automaton has 3272 states and 12598 transitions. Word has length 24 [2021-07-13 20:04:31,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:31,695 INFO L482 AbstractCegarLoop]: Abstraction has 3272 states and 12598 transitions. [2021-07-13 20:04:31,695 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:31,695 INFO L276 IsEmpty]: Start isEmpty. Operand 3272 states and 12598 transitions. [2021-07-13 20:04:31,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:31,700 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:31,700 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:31,900 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 319 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable613 [2021-07-13 20:04:31,901 INFO L430 AbstractCegarLoop]: === Iteration 331 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:31,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:31,901 INFO L82 PathProgramCache]: Analyzing trace with hash -997646652, now seen corresponding path program 194 times [2021-07-13 20:04:31,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:31,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343366925] [2021-07-13 20:04:31,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:31,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:32,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:32,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:32,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343366925] [2021-07-13 20:04:32,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343366925] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:32,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308564393] [2021-07-13 20:04:32,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 320 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 320 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:32,134 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:04:32,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:32,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:04:32,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:32,281 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:32,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:04:32,283 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:32,291 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:32,292 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:32,292 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:04:32,352 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:32,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308564393] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:32,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:32,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:04:32,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529462100] [2021-07-13 20:04:32,352 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:04:32,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:32,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:04:32,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:04:32,353 INFO L87 Difference]: Start difference. First operand 3272 states and 12598 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:35,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:35,239 INFO L93 Difference]: Finished difference Result 4691 states and 16892 transitions. [2021-07-13 20:04:35,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-07-13 20:04:35,239 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:35,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:35,249 INFO L225 Difference]: With dead ends: 4691 [2021-07-13 20:04:35,249 INFO L226 Difference]: Without dead ends: 4635 [2021-07-13 20:04:35,250 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2065 ImplicationChecksByTransitivity, 2474.1ms TimeCoverageRelationStatistics Valid=1006, Invalid=5000, Unknown=0, NotChecked=0, Total=6006 [2021-07-13 20:04:35,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4635 states. [2021-07-13 20:04:35,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4635 to 3315. [2021-07-13 20:04:35,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3315 states, 3314 states have (on average 3.859987929993965) internal successors, (12792), 3314 states have internal predecessors, (12792), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:35,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3315 states to 3315 states and 12792 transitions. [2021-07-13 20:04:35,310 INFO L78 Accepts]: Start accepts. Automaton has 3315 states and 12792 transitions. Word has length 24 [2021-07-13 20:04:35,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:35,311 INFO L482 AbstractCegarLoop]: Abstraction has 3315 states and 12792 transitions. [2021-07-13 20:04:35,311 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:35,311 INFO L276 IsEmpty]: Start isEmpty. Operand 3315 states and 12792 transitions. [2021-07-13 20:04:35,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:35,316 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:35,316 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:35,516 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable615,320 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:35,516 INFO L430 AbstractCegarLoop]: === Iteration 332 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:35,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:35,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1420132378, now seen corresponding path program 195 times [2021-07-13 20:04:35,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:35,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636257409] [2021-07-13 20:04:35,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:35,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:35,698 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:35,699 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:35,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636257409] [2021-07-13 20:04:35,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636257409] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:35,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402501995] [2021-07-13 20:04:35,699 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 321 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 321 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:35,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:04:35,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:35,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 20:04:35,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:35,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:04:35,878 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:35,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 22 treesize of output 56 [2021-07-13 20:04:35,884 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:35,965 INFO L628 ElimStorePlain]: treesize reduction 43, result has 56.6 percent of original size [2021-07-13 20:04:35,966 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:35,966 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:56 [2021-07-13 20:04:36,152 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:36,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402501995] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:36,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:36,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 20:04:36,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521935259] [2021-07-13 20:04:36,153 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:04:36,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:36,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:04:36,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:04:36,154 INFO L87 Difference]: Start difference. First operand 3315 states and 12792 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:36,824 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 40 [2021-07-13 20:04:37,478 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 63 [2021-07-13 20:04:38,458 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 74 [2021-07-13 20:04:39,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:39,821 INFO L93 Difference]: Finished difference Result 4283 states and 15736 transitions. [2021-07-13 20:04:39,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-07-13 20:04:39,822 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:39,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:39,830 INFO L225 Difference]: With dead ends: 4283 [2021-07-13 20:04:39,831 INFO L226 Difference]: Without dead ends: 4266 [2021-07-13 20:04:39,831 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2141 ImplicationChecksByTransitivity, 3267.2ms TimeCoverageRelationStatistics Valid=891, Invalid=5429, Unknown=0, NotChecked=0, Total=6320 [2021-07-13 20:04:39,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4266 states. [2021-07-13 20:04:39,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4266 to 3331. [2021-07-13 20:04:39,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3331 states, 3330 states have (on average 3.863063063063063) internal successors, (12864), 3330 states have internal predecessors, (12864), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:39,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3331 states to 3331 states and 12864 transitions. [2021-07-13 20:04:39,887 INFO L78 Accepts]: Start accepts. Automaton has 3331 states and 12864 transitions. Word has length 24 [2021-07-13 20:04:39,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:39,887 INFO L482 AbstractCegarLoop]: Abstraction has 3331 states and 12864 transitions. [2021-07-13 20:04:39,887 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:39,887 INFO L276 IsEmpty]: Start isEmpty. Operand 3331 states and 12864 transitions. [2021-07-13 20:04:39,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:39,893 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:39,893 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:40,093 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable617,321 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:40,093 INFO L430 AbstractCegarLoop]: === Iteration 333 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:40,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:40,093 INFO L82 PathProgramCache]: Analyzing trace with hash 265611744, now seen corresponding path program 196 times [2021-07-13 20:04:40,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:40,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350677904] [2021-07-13 20:04:40,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:40,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:40,263 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:40,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:40,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350677904] [2021-07-13 20:04:40,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350677904] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:40,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105004986] [2021-07-13 20:04:40,263 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 322 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 322 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:40,289 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:04:40,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:40,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:40,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:40,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:04:40,418 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:40,421 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:40,422 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:40,422 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:9 [2021-07-13 20:04:40,469 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:40,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105004986] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:40,469 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:40,469 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:04:40,469 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604929933] [2021-07-13 20:04:40,470 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:04:40,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:40,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:04:40,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:04:40,470 INFO L87 Difference]: Start difference. First operand 3331 states and 12864 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:40,854 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 39 [2021-07-13 20:04:42,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:42,806 INFO L93 Difference]: Finished difference Result 4180 states and 15490 transitions. [2021-07-13 20:04:42,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-07-13 20:04:42,806 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:42,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:42,814 INFO L225 Difference]: With dead ends: 4180 [2021-07-13 20:04:42,815 INFO L226 Difference]: Without dead ends: 4165 [2021-07-13 20:04:42,815 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1633 ImplicationChecksByTransitivity, 2017.0ms TimeCoverageRelationStatistics Valid=759, Invalid=3933, Unknown=0, NotChecked=0, Total=4692 [2021-07-13 20:04:42,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4165 states. [2021-07-13 20:04:42,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4165 to 3335. [2021-07-13 20:04:42,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3335 states, 3334 states have (on average 3.8629274145170966) internal successors, (12879), 3334 states have internal predecessors, (12879), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:42,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3335 states to 3335 states and 12879 transitions. [2021-07-13 20:04:42,889 INFO L78 Accepts]: Start accepts. Automaton has 3335 states and 12879 transitions. Word has length 24 [2021-07-13 20:04:42,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:42,889 INFO L482 AbstractCegarLoop]: Abstraction has 3335 states and 12879 transitions. [2021-07-13 20:04:42,889 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:42,889 INFO L276 IsEmpty]: Start isEmpty. Operand 3335 states and 12879 transitions. [2021-07-13 20:04:42,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:42,894 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:42,894 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:43,094 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable625,322 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:43,094 INFO L430 AbstractCegarLoop]: === Iteration 334 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:43,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:43,095 INFO L82 PathProgramCache]: Analyzing trace with hash -440717930, now seen corresponding path program 197 times [2021-07-13 20:04:43,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:43,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129871939] [2021-07-13 20:04:43,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:43,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:43,269 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:43,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:43,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129871939] [2021-07-13 20:04:43,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129871939] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:43,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262247752] [2021-07-13 20:04:43,270 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 323 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 323 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:43,296 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:04:43,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:43,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:43,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:43,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:04:43,424 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:43,427 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:43,428 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:43,428 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:9 [2021-07-13 20:04:43,479 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:43,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262247752] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:43,480 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:43,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:04:43,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654178257] [2021-07-13 20:04:43,480 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:04:43,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:43,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:04:43,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:04:43,480 INFO L87 Difference]: Start difference. First operand 3335 states and 12879 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:46,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:46,697 INFO L93 Difference]: Finished difference Result 4826 states and 17391 transitions. [2021-07-13 20:04:46,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-07-13 20:04:46,698 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:46,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:46,708 INFO L225 Difference]: With dead ends: 4826 [2021-07-13 20:04:46,709 INFO L226 Difference]: Without dead ends: 4795 [2021-07-13 20:04:46,709 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2712 ImplicationChecksByTransitivity, 2743.3ms TimeCoverageRelationStatistics Valid=1159, Invalid=6323, Unknown=0, NotChecked=0, Total=7482 [2021-07-13 20:04:46,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4795 states. [2021-07-13 20:04:46,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4795 to 3365. [2021-07-13 20:04:46,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3365 states, 3364 states have (on average 3.8689060642092747) internal successors, (13015), 3364 states have internal predecessors, (13015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:46,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3365 states to 3365 states and 13015 transitions. [2021-07-13 20:04:46,804 INFO L78 Accepts]: Start accepts. Automaton has 3365 states and 13015 transitions. Word has length 24 [2021-07-13 20:04:46,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:46,804 INFO L482 AbstractCegarLoop]: Abstraction has 3365 states and 13015 transitions. [2021-07-13 20:04:46,804 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:46,805 INFO L276 IsEmpty]: Start isEmpty. Operand 3365 states and 13015 transitions. [2021-07-13 20:04:46,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:46,812 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:46,812 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:47,032 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable626,323 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:47,033 INFO L430 AbstractCegarLoop]: === Iteration 335 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:47,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:47,033 INFO L82 PathProgramCache]: Analyzing trace with hash -968550830, now seen corresponding path program 198 times [2021-07-13 20:04:47,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:47,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924697770] [2021-07-13 20:04:47,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:47,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:47,249 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:47,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:47,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924697770] [2021-07-13 20:04:47,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924697770] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:47,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852317053] [2021-07-13 20:04:47,250 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 324 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 324 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:47,276 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:04:47,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:47,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 20:04:47,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:47,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:04:47,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:04:47,532 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:47,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 33 treesize of output 53 [2021-07-13 20:04:47,538 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:47,567 INFO L628 ElimStorePlain]: treesize reduction 16, result has 69.2 percent of original size [2021-07-13 20:04:47,569 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:47,569 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:44, output treesize:41 [2021-07-13 20:04:47,651 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:47,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852317053] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:47,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:47,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2021-07-13 20:04:47,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565474786] [2021-07-13 20:04:47,652 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:04:47,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:47,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:04:47,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:04:47,652 INFO L87 Difference]: Start difference. First operand 3365 states and 13015 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:50,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:50,991 INFO L93 Difference]: Finished difference Result 4795 states and 17888 transitions. [2021-07-13 20:04:50,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-07-13 20:04:50,991 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:50,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:51,001 INFO L225 Difference]: With dead ends: 4795 [2021-07-13 20:04:51,001 INFO L226 Difference]: Without dead ends: 4786 [2021-07-13 20:04:51,002 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1321 ImplicationChecksByTransitivity, 2653.5ms TimeCoverageRelationStatistics Valid=651, Invalid=3771, Unknown=0, NotChecked=0, Total=4422 [2021-07-13 20:04:51,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4786 states. [2021-07-13 20:04:51,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4786 to 3369. [2021-07-13 20:04:51,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3369 states, 3368 states have (on average 3.8696555819477436) internal successors, (13033), 3368 states have internal predecessors, (13033), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:51,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3369 states to 3369 states and 13033 transitions. [2021-07-13 20:04:51,064 INFO L78 Accepts]: Start accepts. Automaton has 3369 states and 13033 transitions. Word has length 24 [2021-07-13 20:04:51,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:51,065 INFO L482 AbstractCegarLoop]: Abstraction has 3369 states and 13033 transitions. [2021-07-13 20:04:51,065 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:51,065 INFO L276 IsEmpty]: Start isEmpty. Operand 3369 states and 13033 transitions. [2021-07-13 20:04:51,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:51,070 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:51,070 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:51,270 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 324 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable627 [2021-07-13 20:04:51,271 INFO L430 AbstractCegarLoop]: === Iteration 336 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:51,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:51,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1478066694, now seen corresponding path program 199 times [2021-07-13 20:04:51,271 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:51,271 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800828024] [2021-07-13 20:04:51,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:51,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:51,501 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:51,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:51,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800828024] [2021-07-13 20:04:51,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800828024] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:51,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546173160] [2021-07-13 20:04:51,501 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 325 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 325 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:51,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:51,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:51,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:51,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:04:51,702 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:51,704 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:51,704 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:51,704 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 20:04:51,735 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:51,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [546173160] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:51,735 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:51,735 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:04:51,735 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502108746] [2021-07-13 20:04:51,735 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:04:51,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:51,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:04:51,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:04:51,736 INFO L87 Difference]: Start difference. First operand 3369 states and 13033 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:53,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:53,136 INFO L93 Difference]: Finished difference Result 4091 states and 15410 transitions. [2021-07-13 20:04:53,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-07-13 20:04:53,136 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:53,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:53,144 INFO L225 Difference]: With dead ends: 4091 [2021-07-13 20:04:53,144 INFO L226 Difference]: Without dead ends: 4082 [2021-07-13 20:04:53,145 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1088.7ms TimeCoverageRelationStatistics Valid=313, Invalid=1943, Unknown=0, NotChecked=0, Total=2256 [2021-07-13 20:04:53,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4082 states. [2021-07-13 20:04:53,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4082 to 3374. [2021-07-13 20:04:53,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3374 states, 3373 states have (on average 3.868662911354877) internal successors, (13049), 3373 states have internal predecessors, (13049), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:53,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3374 states to 3374 states and 13049 transitions. [2021-07-13 20:04:53,201 INFO L78 Accepts]: Start accepts. Automaton has 3374 states and 13049 transitions. Word has length 24 [2021-07-13 20:04:53,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:53,202 INFO L482 AbstractCegarLoop]: Abstraction has 3374 states and 13049 transitions. [2021-07-13 20:04:53,202 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:53,202 INFO L276 IsEmpty]: Start isEmpty. Operand 3374 states and 13049 transitions. [2021-07-13 20:04:53,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:53,207 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:53,207 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:53,408 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable633,325 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:53,409 INFO L430 AbstractCegarLoop]: === Iteration 337 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:53,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:53,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1687604074, now seen corresponding path program 200 times [2021-07-13 20:04:53,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:53,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593604890] [2021-07-13 20:04:53,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:53,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:53,625 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:53,625 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:53,625 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593604890] [2021-07-13 20:04:53,625 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593604890] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:53,625 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384560094] [2021-07-13 20:04:53,625 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 326 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 326 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:53,653 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:04:53,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:53,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:53,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:53,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:04:53,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:04:53,852 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:53,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 38 [2021-07-13 20:04:53,855 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 20:04:53,878 INFO L628 ElimStorePlain]: treesize reduction 25, result has 46.8 percent of original size [2021-07-13 20:04:53,878 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:53,878 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:22 [2021-07-13 20:04:53,943 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:53,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384560094] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:53,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:53,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 20:04:53,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753273506] [2021-07-13 20:04:53,944 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 20:04:53,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:53,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 20:04:53,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=519, Unknown=0, NotChecked=0, Total=600 [2021-07-13 20:04:53,944 INFO L87 Difference]: Start difference. First operand 3374 states and 13049 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:55,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:55,359 INFO L93 Difference]: Finished difference Result 3999 states and 15033 transitions. [2021-07-13 20:04:55,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-07-13 20:04:55,359 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:55,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:55,367 INFO L225 Difference]: With dead ends: 3999 [2021-07-13 20:04:55,368 INFO L226 Difference]: Without dead ends: 3981 [2021-07-13 20:04:55,368 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 737 ImplicationChecksByTransitivity, 1268.9ms TimeCoverageRelationStatistics Valid=400, Invalid=2462, Unknown=0, NotChecked=0, Total=2862 [2021-07-13 20:04:55,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3981 states. [2021-07-13 20:04:55,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3981 to 3388. [2021-07-13 20:04:55,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3388 states, 3387 states have (on average 3.8665485680543252) internal successors, (13096), 3387 states have internal predecessors, (13096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:55,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3388 states to 3388 states and 13096 transitions. [2021-07-13 20:04:55,422 INFO L78 Accepts]: Start accepts. Automaton has 3388 states and 13096 transitions. Word has length 24 [2021-07-13 20:04:55,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:55,422 INFO L482 AbstractCegarLoop]: Abstraction has 3388 states and 13096 transitions. [2021-07-13 20:04:55,422 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:55,422 INFO L276 IsEmpty]: Start isEmpty. Operand 3388 states and 13096 transitions. [2021-07-13 20:04:55,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:55,428 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:55,428 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:55,628 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 326 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable634 [2021-07-13 20:04:55,628 INFO L430 AbstractCegarLoop]: === Iteration 338 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:55,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:55,628 INFO L82 PathProgramCache]: Analyzing trace with hash 41067672, now seen corresponding path program 201 times [2021-07-13 20:04:55,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:55,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634361444] [2021-07-13 20:04:55,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:55,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:55,833 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:55,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:55,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634361444] [2021-07-13 20:04:55,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634361444] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:55,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860111419] [2021-07-13 20:04:55,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 327 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 327 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:55,862 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:04:55,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:55,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:04:55,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:56,051 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:56,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:04:56,053 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:56,062 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:56,063 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:56,063 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:04:56,133 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:56,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860111419] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:56,133 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:56,133 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:04:56,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210740440] [2021-07-13 20:04:56,134 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:04:56,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:56,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:04:56,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:04:56,134 INFO L87 Difference]: Start difference. First operand 3388 states and 13096 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:56,482 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 49 [2021-07-13 20:04:58,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:04:58,321 INFO L93 Difference]: Finished difference Result 4200 states and 15720 transitions. [2021-07-13 20:04:58,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-07-13 20:04:58,321 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:04:58,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:04:58,329 INFO L225 Difference]: With dead ends: 4200 [2021-07-13 20:04:58,329 INFO L226 Difference]: Without dead ends: 4181 [2021-07-13 20:04:58,330 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1830.1ms TimeCoverageRelationStatistics Valid=485, Invalid=3055, Unknown=0, NotChecked=0, Total=3540 [2021-07-13 20:04:58,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4181 states. [2021-07-13 20:04:58,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4181 to 3383. [2021-07-13 20:04:58,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3383 states, 3382 states have (on average 3.868125369603785) internal successors, (13082), 3382 states have internal predecessors, (13082), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:58,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3383 states to 3383 states and 13082 transitions. [2021-07-13 20:04:58,385 INFO L78 Accepts]: Start accepts. Automaton has 3383 states and 13082 transitions. Word has length 24 [2021-07-13 20:04:58,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:04:58,385 INFO L482 AbstractCegarLoop]: Abstraction has 3383 states and 13082 transitions. [2021-07-13 20:04:58,385 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:04:58,385 INFO L276 IsEmpty]: Start isEmpty. Operand 3383 states and 13082 transitions. [2021-07-13 20:04:58,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:04:58,390 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:04:58,390 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:04:58,590 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable638,327 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:58,591 INFO L430 AbstractCegarLoop]: === Iteration 339 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:04:58,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:04:58,591 INFO L82 PathProgramCache]: Analyzing trace with hash -987082188, now seen corresponding path program 202 times [2021-07-13 20:04:58,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:04:58,591 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314710358] [2021-07-13 20:04:58,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:04:58,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:04:58,801 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:58,801 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:04:58,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314710358] [2021-07-13 20:04:58,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314710358] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:58,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052430298] [2021-07-13 20:04:58,801 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 328 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 328 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:04:58,829 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:04:58,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:04:58,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:04:58,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:04:58,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:04:58,950 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:04:58,953 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:04:58,953 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:04:58,953 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:04:58,999 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:04:58,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052430298] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:04:58,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:04:58,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:04:58,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840086678] [2021-07-13 20:04:59,000 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:04:59,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:04:59,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:04:59,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:04:59,000 INFO L87 Difference]: Start difference. First operand 3383 states and 13082 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:00,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:00,188 INFO L93 Difference]: Finished difference Result 4061 states and 15309 transitions. [2021-07-13 20:05:00,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-07-13 20:05:00,188 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:00,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:00,196 INFO L225 Difference]: With dead ends: 4061 [2021-07-13 20:05:00,196 INFO L226 Difference]: Without dead ends: 4052 [2021-07-13 20:05:00,197 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 958.0ms TimeCoverageRelationStatistics Valid=279, Invalid=1613, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 20:05:00,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4052 states. [2021-07-13 20:05:00,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4052 to 3392. [2021-07-13 20:05:00,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3392 states, 3391 states have (on average 3.8661161899144796) internal successors, (13110), 3391 states have internal predecessors, (13110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:00,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3392 states to 3392 states and 13110 transitions. [2021-07-13 20:05:00,251 INFO L78 Accepts]: Start accepts. Automaton has 3392 states and 13110 transitions. Word has length 24 [2021-07-13 20:05:00,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:00,251 INFO L482 AbstractCegarLoop]: Abstraction has 3392 states and 13110 transitions. [2021-07-13 20:05:00,251 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:00,251 INFO L276 IsEmpty]: Start isEmpty. Operand 3392 states and 13110 transitions. [2021-07-13 20:05:00,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:00,256 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:00,256 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:00,457 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable641,328 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:00,457 INFO L430 AbstractCegarLoop]: === Iteration 340 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:00,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:00,457 INFO L82 PathProgramCache]: Analyzing trace with hash -663496010, now seen corresponding path program 203 times [2021-07-13 20:05:00,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:00,457 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243881725] [2021-07-13 20:05:00,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:00,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:00,654 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:00,654 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:00,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243881725] [2021-07-13 20:05:00,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243881725] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:00,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819205001] [2021-07-13 20:05:00,654 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 329 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 329 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:00,682 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:05:00,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:00,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:00,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:00,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:05:00,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:00,829 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:00,829 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:00,829 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:05:00,876 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:00,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819205001] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:00,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:00,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:05:00,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312571187] [2021-07-13 20:05:00,876 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:05:00,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:00,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:05:00,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:05:00,877 INFO L87 Difference]: Start difference. First operand 3392 states and 13110 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:02,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:02,279 INFO L93 Difference]: Finished difference Result 4052 states and 15285 transitions. [2021-07-13 20:05:02,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-07-13 20:05:02,279 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:02,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:02,287 INFO L225 Difference]: With dead ends: 4052 [2021-07-13 20:05:02,287 INFO L226 Difference]: Without dead ends: 4041 [2021-07-13 20:05:02,288 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 1046.1ms TimeCoverageRelationStatistics Valid=282, Invalid=1880, Unknown=0, NotChecked=0, Total=2162 [2021-07-13 20:05:02,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4041 states. [2021-07-13 20:05:02,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4041 to 3382. [2021-07-13 20:05:02,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3382 states, 3381 states have (on average 3.868086364980775) internal successors, (13078), 3381 states have internal predecessors, (13078), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:02,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3382 states to 3382 states and 13078 transitions. [2021-07-13 20:05:02,344 INFO L78 Accepts]: Start accepts. Automaton has 3382 states and 13078 transitions. Word has length 24 [2021-07-13 20:05:02,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:02,344 INFO L482 AbstractCegarLoop]: Abstraction has 3382 states and 13078 transitions. [2021-07-13 20:05:02,344 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:02,344 INFO L276 IsEmpty]: Start isEmpty. Operand 3382 states and 13078 transitions. [2021-07-13 20:05:02,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:02,350 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:02,350 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:02,550 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 329 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable642 [2021-07-13 20:05:02,550 INFO L430 AbstractCegarLoop]: === Iteration 341 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:02,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:02,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1788704418, now seen corresponding path program 204 times [2021-07-13 20:05:02,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:02,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679982299] [2021-07-13 20:05:02,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:02,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:02,756 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:02,756 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:02,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679982299] [2021-07-13 20:05:02,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679982299] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:02,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465771762] [2021-07-13 20:05:02,756 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 330 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 330 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:02,785 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:05:02,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:02,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 20:05:02,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:03,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:03,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:03,031 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:03,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 33 treesize of output 53 [2021-07-13 20:05:03,038 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:03,067 INFO L628 ElimStorePlain]: treesize reduction 16, result has 69.2 percent of original size [2021-07-13 20:05:03,069 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:03,069 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:44, output treesize:41 [2021-07-13 20:05:03,151 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:03,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465771762] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:03,151 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:03,151 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2021-07-13 20:05:03,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870246557] [2021-07-13 20:05:03,151 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:03,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:03,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:03,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:03,152 INFO L87 Difference]: Start difference. First operand 3382 states and 13078 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:04,939 WARN L205 SmtUtils]: Spent 366.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 55 [2021-07-13 20:05:05,687 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 53 [2021-07-13 20:05:07,426 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 49 [2021-07-13 20:05:07,981 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 51 [2021-07-13 20:05:08,752 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 50 [2021-07-13 20:05:09,902 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 50 [2021-07-13 20:05:12,339 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2021-07-13 20:05:12,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:12,524 INFO L93 Difference]: Finished difference Result 6012 states and 21882 transitions. [2021-07-13 20:05:12,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-07-13 20:05:12,525 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:12,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:12,542 INFO L225 Difference]: With dead ends: 6012 [2021-07-13 20:05:12,543 INFO L226 Difference]: Without dead ends: 5983 [2021-07-13 20:05:12,543 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2708 ImplicationChecksByTransitivity, 6141.5ms TimeCoverageRelationStatistics Valid=1268, Invalid=6742, Unknown=0, NotChecked=0, Total=8010 [2021-07-13 20:05:12,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5983 states. [2021-07-13 20:05:12,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5983 to 3413. [2021-07-13 20:05:12,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3413 states, 3412 states have (on average 3.8710433763188745) internal successors, (13208), 3412 states have internal predecessors, (13208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:12,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3413 states to 3413 states and 13208 transitions. [2021-07-13 20:05:12,646 INFO L78 Accepts]: Start accepts. Automaton has 3413 states and 13208 transitions. Word has length 24 [2021-07-13 20:05:12,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:12,646 INFO L482 AbstractCegarLoop]: Abstraction has 3413 states and 13208 transitions. [2021-07-13 20:05:12,646 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:12,647 INFO L276 IsEmpty]: Start isEmpty. Operand 3413 states and 13208 transitions. [2021-07-13 20:05:12,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:12,654 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:12,654 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:12,868 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable643,330 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:12,869 INFO L430 AbstractCegarLoop]: === Iteration 342 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:12,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:12,869 INFO L82 PathProgramCache]: Analyzing trace with hash -52244372, now seen corresponding path program 205 times [2021-07-13 20:05:12,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:12,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774828018] [2021-07-13 20:05:12,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:12,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:13,181 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:13,181 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:13,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774828018] [2021-07-13 20:05:13,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774828018] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:13,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201590532] [2021-07-13 20:05:13,181 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 331 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 331 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:13,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:13,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:13,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:13,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:05:13,430 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:13,431 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:13,432 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:13,432 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:05:13,474 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:13,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201590532] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:13,474 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:13,474 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:05:13,475 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021878915] [2021-07-13 20:05:13,475 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:13,475 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:13,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:13,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:13,475 INFO L87 Difference]: Start difference. First operand 3413 states and 13208 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:16,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:16,507 INFO L93 Difference]: Finished difference Result 4406 states and 16378 transitions. [2021-07-13 20:05:16,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-07-13 20:05:16,507 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:16,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:16,520 INFO L225 Difference]: With dead ends: 4406 [2021-07-13 20:05:16,520 INFO L226 Difference]: Without dead ends: 4388 [2021-07-13 20:05:16,521 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1023 ImplicationChecksByTransitivity, 2327.2ms TimeCoverageRelationStatistics Valid=535, Invalid=3371, Unknown=0, NotChecked=0, Total=3906 [2021-07-13 20:05:16,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4388 states. [2021-07-13 20:05:16,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4388 to 3416. [2021-07-13 20:05:16,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3416 states, 3415 states have (on average 3.8699853587115665) internal successors, (13216), 3415 states have internal predecessors, (13216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:16,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3416 states to 3416 states and 13216 transitions. [2021-07-13 20:05:16,638 INFO L78 Accepts]: Start accepts. Automaton has 3416 states and 13216 transitions. Word has length 24 [2021-07-13 20:05:16,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:16,638 INFO L482 AbstractCegarLoop]: Abstraction has 3416 states and 13216 transitions. [2021-07-13 20:05:16,638 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:16,638 INFO L276 IsEmpty]: Start isEmpty. Operand 3416 states and 13216 transitions. [2021-07-13 20:05:16,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:16,645 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:16,645 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:16,868 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 331 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable650 [2021-07-13 20:05:16,868 INFO L430 AbstractCegarLoop]: === Iteration 343 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:16,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:16,868 INFO L82 PathProgramCache]: Analyzing trace with hash 2090131316, now seen corresponding path program 206 times [2021-07-13 20:05:16,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:16,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296158687] [2021-07-13 20:05:16,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:16,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:17,133 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:17,134 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:17,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296158687] [2021-07-13 20:05:17,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296158687] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:17,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047209489] [2021-07-13 20:05:17,134 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 332 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 332 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:17,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:05:17,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:17,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:05:17,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:17,369 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:17,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:05:17,371 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:17,381 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:17,382 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:17,382 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:05:17,468 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:17,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047209489] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:17,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:17,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:05:17,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565521451] [2021-07-13 20:05:17,469 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:05:17,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:17,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:05:17,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:05:17,469 INFO L87 Difference]: Start difference. First operand 3416 states and 13216 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:17,883 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 47 [2021-07-13 20:05:18,468 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 51 [2021-07-13 20:05:19,306 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 50 [2021-07-13 20:05:19,597 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 55 [2021-07-13 20:05:20,178 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 53 [2021-07-13 20:05:20,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:20,834 INFO L93 Difference]: Finished difference Result 4399 states and 16319 transitions. [2021-07-13 20:05:20,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-07-13 20:05:20,835 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:20,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:20,847 INFO L225 Difference]: With dead ends: 4399 [2021-07-13 20:05:20,847 INFO L226 Difference]: Without dead ends: 4370 [2021-07-13 20:05:20,847 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1028 ImplicationChecksByTransitivity, 2810.8ms TimeCoverageRelationStatistics Valid=553, Invalid=3107, Unknown=0, NotChecked=0, Total=3660 [2021-07-13 20:05:20,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4370 states. [2021-07-13 20:05:20,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4370 to 3419. [2021-07-13 20:05:20,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3419 states, 3418 states have (on average 3.868929198361615) internal successors, (13224), 3418 states have internal predecessors, (13224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:20,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3419 states to 3419 states and 13224 transitions. [2021-07-13 20:05:20,921 INFO L78 Accepts]: Start accepts. Automaton has 3419 states and 13224 transitions. Word has length 24 [2021-07-13 20:05:20,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:20,922 INFO L482 AbstractCegarLoop]: Abstraction has 3419 states and 13224 transitions. [2021-07-13 20:05:20,922 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:20,922 INFO L276 IsEmpty]: Start isEmpty. Operand 3419 states and 13224 transitions. [2021-07-13 20:05:20,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:20,928 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:20,928 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:21,151 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 332 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable651 [2021-07-13 20:05:21,151 INFO L430 AbstractCegarLoop]: === Iteration 344 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:21,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:21,152 INFO L82 PathProgramCache]: Analyzing trace with hash -268592468, now seen corresponding path program 207 times [2021-07-13 20:05:21,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:21,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683721191] [2021-07-13 20:05:21,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:21,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:21,417 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:21,417 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:21,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683721191] [2021-07-13 20:05:21,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683721191] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:21,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027727772] [2021-07-13 20:05:21,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 333 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 333 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:21,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:05:21,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:21,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:05:21,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:21,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:21,738 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:05:21,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:05:21,740 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:21,744 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:21,745 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:21,746 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:5 [2021-07-13 20:05:21,780 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:21,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027727772] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:21,781 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:21,781 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:05:21,781 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665847125] [2021-07-13 20:05:21,781 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:05:21,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:21,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:05:21,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:05:21,782 INFO L87 Difference]: Start difference. First operand 3419 states and 13224 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:22,253 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 39 [2021-07-13 20:05:24,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:24,792 INFO L93 Difference]: Finished difference Result 4271 states and 15932 transitions. [2021-07-13 20:05:24,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-07-13 20:05:24,792 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:24,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:24,803 INFO L225 Difference]: With dead ends: 4271 [2021-07-13 20:05:24,804 INFO L226 Difference]: Without dead ends: 4242 [2021-07-13 20:05:24,804 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 2389.3ms TimeCoverageRelationStatistics Valid=505, Invalid=3035, Unknown=0, NotChecked=0, Total=3540 [2021-07-13 20:05:24,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4242 states. [2021-07-13 20:05:24,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4242 to 3415. [2021-07-13 20:05:24,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3415 states, 3414 states have (on average 3.87111892208553) internal successors, (13216), 3414 states have internal predecessors, (13216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:24,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3415 states to 3415 states and 13216 transitions. [2021-07-13 20:05:24,879 INFO L78 Accepts]: Start accepts. Automaton has 3415 states and 13216 transitions. Word has length 24 [2021-07-13 20:05:24,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:24,879 INFO L482 AbstractCegarLoop]: Abstraction has 3415 states and 13216 transitions. [2021-07-13 20:05:24,879 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:24,879 INFO L276 IsEmpty]: Start isEmpty. Operand 3415 states and 13216 transitions. [2021-07-13 20:05:24,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:24,886 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:24,886 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:25,104 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 333 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable654 [2021-07-13 20:05:25,105 INFO L430 AbstractCegarLoop]: === Iteration 345 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:25,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:25,105 INFO L82 PathProgramCache]: Analyzing trace with hash -445133900, now seen corresponding path program 208 times [2021-07-13 20:05:25,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:25,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987793302] [2021-07-13 20:05:25,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:25,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:25,426 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:25,427 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:25,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987793302] [2021-07-13 20:05:25,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987793302] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:25,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696779175] [2021-07-13 20:05:25,427 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 334 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 334 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:25,460 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:05:25,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:25,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:25,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:25,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:05:25,605 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:25,608 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:25,608 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:25,608 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:05:25,661 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:25,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696779175] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:25,662 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:25,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:05:25,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902928906] [2021-07-13 20:05:25,662 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:05:25,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:25,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:05:25,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:05:25,662 INFO L87 Difference]: Start difference. First operand 3415 states and 13216 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:26,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:26,984 INFO L93 Difference]: Finished difference Result 4098 states and 15416 transitions. [2021-07-13 20:05:26,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 20:05:26,984 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:26,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:26,994 INFO L225 Difference]: With dead ends: 4098 [2021-07-13 20:05:26,994 INFO L226 Difference]: Without dead ends: 4089 [2021-07-13 20:05:26,995 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 1216.0ms TimeCoverageRelationStatistics Valid=276, Invalid=1364, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:05:26,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4089 states. [2021-07-13 20:05:27,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4089 to 3420. [2021-07-13 20:05:27,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3420 states, 3419 states have (on average 3.869552500731208) internal successors, (13230), 3419 states have internal predecessors, (13230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:27,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3420 states to 3420 states and 13230 transitions. [2021-07-13 20:05:27,067 INFO L78 Accepts]: Start accepts. Automaton has 3420 states and 13230 transitions. Word has length 24 [2021-07-13 20:05:27,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:27,068 INFO L482 AbstractCegarLoop]: Abstraction has 3420 states and 13230 transitions. [2021-07-13 20:05:27,068 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:27,068 INFO L276 IsEmpty]: Start isEmpty. Operand 3420 states and 13230 transitions. [2021-07-13 20:05:27,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:27,074 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:27,074 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:27,289 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable655,334 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:27,289 INFO L430 AbstractCegarLoop]: === Iteration 346 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:27,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:27,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1278872340, now seen corresponding path program 209 times [2021-07-13 20:05:27,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:27,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904882020] [2021-07-13 20:05:27,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:27,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:27,563 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:27,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:27,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904882020] [2021-07-13 20:05:27,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904882020] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:27,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108262908] [2021-07-13 20:05:27,563 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 335 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 335 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:27,600 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:05:27,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:27,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:27,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:27,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:05:27,782 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:27,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:27,786 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:27,786 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:05:27,845 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:27,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108262908] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:27,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:27,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:05:27,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496119994] [2021-07-13 20:05:27,846 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:05:27,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:27,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:05:27,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:05:27,846 INFO L87 Difference]: Start difference. First operand 3420 states and 13230 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:29,101 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 30 [2021-07-13 20:05:29,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:29,585 INFO L93 Difference]: Finished difference Result 4071 states and 15334 transitions. [2021-07-13 20:05:29,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 20:05:29,585 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:29,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:29,596 INFO L225 Difference]: With dead ends: 4071 [2021-07-13 20:05:29,596 INFO L226 Difference]: Without dead ends: 4061 [2021-07-13 20:05:29,596 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 1330.2ms TimeCoverageRelationStatistics Valid=272, Invalid=1450, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 20:05:29,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4061 states. [2021-07-13 20:05:29,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4061 to 3413. [2021-07-13 20:05:29,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3413 states, 3412 states have (on average 3.8710433763188745) internal successors, (13208), 3412 states have internal predecessors, (13208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:29,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3413 states to 3413 states and 13208 transitions. [2021-07-13 20:05:29,665 INFO L78 Accepts]: Start accepts. Automaton has 3413 states and 13208 transitions. Word has length 24 [2021-07-13 20:05:29,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:29,665 INFO L482 AbstractCegarLoop]: Abstraction has 3413 states and 13208 transitions. [2021-07-13 20:05:29,665 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:29,665 INFO L276 IsEmpty]: Start isEmpty. Operand 3413 states and 13208 transitions. [2021-07-13 20:05:29,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:29,672 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:29,672 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:29,893 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 335 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable656 [2021-07-13 20:05:29,893 INFO L430 AbstractCegarLoop]: === Iteration 347 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:29,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:29,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1156910420, now seen corresponding path program 210 times [2021-07-13 20:05:29,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:29,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094395643] [2021-07-13 20:05:29,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:29,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:30,341 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:30,341 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:30,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094395643] [2021-07-13 20:05:30,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094395643] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:30,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048193665] [2021-07-13 20:05:30,342 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 336 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 336 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:30,376 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:05:30,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:30,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 20:05:30,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:30,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:30,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:30,667 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:30,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 33 treesize of output 53 [2021-07-13 20:05:30,699 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:30,733 INFO L628 ElimStorePlain]: treesize reduction 46, result has 43.9 percent of original size [2021-07-13 20:05:30,736 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:30,736 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:44, output treesize:41 [2021-07-13 20:05:30,818 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:30,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048193665] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:30,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:30,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2021-07-13 20:05:30,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481556288] [2021-07-13 20:05:30,819 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:30,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:30,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:30,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:30,819 INFO L87 Difference]: Start difference. First operand 3413 states and 13208 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:32,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:32,410 INFO L93 Difference]: Finished difference Result 3889 states and 14696 transitions. [2021-07-13 20:05:32,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 20:05:32,410 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:32,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:32,420 INFO L225 Difference]: With dead ends: 3889 [2021-07-13 20:05:32,420 INFO L226 Difference]: Without dead ends: 3880 [2021-07-13 20:05:32,420 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 1679.7ms TimeCoverageRelationStatistics Valid=361, Invalid=1445, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:05:32,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3880 states. [2021-07-13 20:05:32,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3880 to 3413. [2021-07-13 20:05:32,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3413 states, 3412 states have (on average 3.8710433763188745) internal successors, (13208), 3412 states have internal predecessors, (13208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:32,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3413 states to 3413 states and 13208 transitions. [2021-07-13 20:05:32,488 INFO L78 Accepts]: Start accepts. Automaton has 3413 states and 13208 transitions. Word has length 24 [2021-07-13 20:05:32,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:32,488 INFO L482 AbstractCegarLoop]: Abstraction has 3413 states and 13208 transitions. [2021-07-13 20:05:32,488 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:32,489 INFO L276 IsEmpty]: Start isEmpty. Operand 3413 states and 13208 transitions. [2021-07-13 20:05:32,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:32,495 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:32,495 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:32,698 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable657,336 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:32,699 INFO L430 AbstractCegarLoop]: === Iteration 348 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:32,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:32,699 INFO L82 PathProgramCache]: Analyzing trace with hash 362223946, now seen corresponding path program 211 times [2021-07-13 20:05:32,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:32,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331340822] [2021-07-13 20:05:32,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:32,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:32,967 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:32,967 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:32,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331340822] [2021-07-13 20:05:32,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1331340822] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:32,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193995937] [2021-07-13 20:05:32,967 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 337 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 337 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:33,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:33,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:33,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:33,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:05:33,212 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:33,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:33,214 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:33,215 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:05:33,255 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:33,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193995937] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:33,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:33,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:05:33,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771316511] [2021-07-13 20:05:33,255 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:33,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:33,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:33,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:33,256 INFO L87 Difference]: Start difference. First operand 3413 states and 13208 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:34,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:34,851 INFO L93 Difference]: Finished difference Result 3907 states and 14738 transitions. [2021-07-13 20:05:34,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:05:34,851 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:34,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:34,862 INFO L225 Difference]: With dead ends: 3907 [2021-07-13 20:05:34,862 INFO L226 Difference]: Without dead ends: 3897 [2021-07-13 20:05:34,863 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1354.5ms TimeCoverageRelationStatistics Valid=284, Invalid=1608, Unknown=0, NotChecked=0, Total=1892 [2021-07-13 20:05:34,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3897 states. [2021-07-13 20:05:34,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3897 to 3413. [2021-07-13 20:05:34,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3413 states, 3412 states have (on average 3.8710433763188745) internal successors, (13208), 3412 states have internal predecessors, (13208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:34,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3413 states to 3413 states and 13208 transitions. [2021-07-13 20:05:34,947 INFO L78 Accepts]: Start accepts. Automaton has 3413 states and 13208 transitions. Word has length 24 [2021-07-13 20:05:34,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:34,948 INFO L482 AbstractCegarLoop]: Abstraction has 3413 states and 13208 transitions. [2021-07-13 20:05:34,948 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:34,948 INFO L276 IsEmpty]: Start isEmpty. Operand 3413 states and 13208 transitions. [2021-07-13 20:05:34,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:34,955 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:34,955 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:35,176 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 337 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable663 [2021-07-13 20:05:35,177 INFO L430 AbstractCegarLoop]: === Iteration 349 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:35,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:35,177 INFO L82 PathProgramCache]: Analyzing trace with hash -665925914, now seen corresponding path program 212 times [2021-07-13 20:05:35,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:35,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777716470] [2021-07-13 20:05:35,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:35,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:35,401 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:35,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:35,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777716470] [2021-07-13 20:05:35,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777716470] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:35,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677720141] [2021-07-13 20:05:35,402 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 338 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 338 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:35,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:05:35,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:35,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:05:35,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:35,770 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:35,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:05:35,780 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:35,790 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:35,791 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:35,791 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:05:35,904 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:35,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677720141] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:35,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:35,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:05:35,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951738975] [2021-07-13 20:05:35,905 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:35,905 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:35,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:35,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:35,905 INFO L87 Difference]: Start difference. First operand 3413 states and 13208 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:36,714 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 36 [2021-07-13 20:05:37,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:37,617 INFO L93 Difference]: Finished difference Result 3822 states and 14477 transitions. [2021-07-13 20:05:37,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 20:05:37,617 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:37,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:37,628 INFO L225 Difference]: With dead ends: 3822 [2021-07-13 20:05:37,628 INFO L226 Difference]: Without dead ends: 3813 [2021-07-13 20:05:37,629 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 1467.1ms TimeCoverageRelationStatistics Valid=247, Invalid=1313, Unknown=0, NotChecked=0, Total=1560 [2021-07-13 20:05:37,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3813 states. [2021-07-13 20:05:37,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3813 to 3417. [2021-07-13 20:05:37,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3417 states, 3416 states have (on average 3.870023419203747) internal successors, (13220), 3416 states have internal predecessors, (13220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:37,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3417 states to 3417 states and 13220 transitions. [2021-07-13 20:05:37,703 INFO L78 Accepts]: Start accepts. Automaton has 3417 states and 13220 transitions. Word has length 24 [2021-07-13 20:05:37,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:37,703 INFO L482 AbstractCegarLoop]: Abstraction has 3417 states and 13220 transitions. [2021-07-13 20:05:37,703 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:37,703 INFO L276 IsEmpty]: Start isEmpty. Operand 3417 states and 13220 transitions. [2021-07-13 20:05:37,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:37,710 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:37,710 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:37,933 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 338 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable664 [2021-07-13 20:05:37,933 INFO L430 AbstractCegarLoop]: === Iteration 350 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:37,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:37,934 INFO L82 PathProgramCache]: Analyzing trace with hash -342339736, now seen corresponding path program 213 times [2021-07-13 20:05:37,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:37,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36685872] [2021-07-13 20:05:37,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:37,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:38,581 WARN L205 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2021-07-13 20:05:38,956 WARN L205 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2021-07-13 20:05:39,120 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:39,121 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:39,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36685872] [2021-07-13 20:05:39,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36685872] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:39,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773673696] [2021-07-13 20:05:39,121 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 339 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 339 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:39,156 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:05:39,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:39,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 35 conjunts are in the unsatisfiable core [2021-07-13 20:05:39,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:39,331 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:39,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 37 [2021-07-13 20:05:39,333 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:39,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:39,351 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:39,351 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:37 [2021-07-13 20:05:39,650 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:39,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773673696] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:39,650 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:39,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 20:05:39,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924043303] [2021-07-13 20:05:39,650 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:05:39,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:39,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:05:39,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:05:39,651 INFO L87 Difference]: Start difference. First operand 3417 states and 13220 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:39,969 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2021-07-13 20:05:41,056 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 43 [2021-07-13 20:05:41,676 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 51 [2021-07-13 20:05:42,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:42,325 INFO L93 Difference]: Finished difference Result 3831 states and 14475 transitions. [2021-07-13 20:05:42,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-13 20:05:42,326 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:42,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:42,335 INFO L225 Difference]: With dead ends: 3831 [2021-07-13 20:05:42,336 INFO L226 Difference]: Without dead ends: 3822 [2021-07-13 20:05:42,336 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 639 ImplicationChecksByTransitivity, 3192.5ms TimeCoverageRelationStatistics Valid=356, Invalid=2094, Unknown=0, NotChecked=0, Total=2450 [2021-07-13 20:05:42,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3822 states. [2021-07-13 20:05:42,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3822 to 3419. [2021-07-13 20:05:42,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3419 states, 3418 states have (on average 3.8695143358689292) internal successors, (13226), 3418 states have internal predecessors, (13226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:42,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3419 states to 3419 states and 13226 transitions. [2021-07-13 20:05:42,404 INFO L78 Accepts]: Start accepts. Automaton has 3419 states and 13226 transitions. Word has length 24 [2021-07-13 20:05:42,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:42,404 INFO L482 AbstractCegarLoop]: Abstraction has 3419 states and 13226 transitions. [2021-07-13 20:05:42,404 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:42,404 INFO L276 IsEmpty]: Start isEmpty. Operand 3419 states and 13226 transitions. [2021-07-13 20:05:42,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:42,411 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:42,411 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:42,628 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 339 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable666 [2021-07-13 20:05:42,629 INFO L430 AbstractCegarLoop]: === Iteration 351 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:42,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:42,629 INFO L82 PathProgramCache]: Analyzing trace with hash 1343404386, now seen corresponding path program 214 times [2021-07-13 20:05:42,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:42,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862466482] [2021-07-13 20:05:42,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:42,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:42,871 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:42,871 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:42,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862466482] [2021-07-13 20:05:42,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862466482] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:42,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450876913] [2021-07-13 20:05:42,871 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 340 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 340 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:42,906 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:05:42,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:42,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:42,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:43,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:05:43,062 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:43,065 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:43,066 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:43,066 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:05:43,116 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:43,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1450876913] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:43,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:43,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:05:43,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569409527] [2021-07-13 20:05:43,117 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:05:43,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:43,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:05:43,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:05:43,118 INFO L87 Difference]: Start difference. First operand 3419 states and 13226 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:44,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:44,275 INFO L93 Difference]: Finished difference Result 3799 states and 14404 transitions. [2021-07-13 20:05:44,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 20:05:44,276 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:44,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:44,285 INFO L225 Difference]: With dead ends: 3799 [2021-07-13 20:05:44,285 INFO L226 Difference]: Without dead ends: 3788 [2021-07-13 20:05:44,286 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 1004.8ms TimeCoverageRelationStatistics Valid=193, Invalid=1213, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 20:05:44,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3788 states. [2021-07-13 20:05:44,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3788 to 3413. [2021-07-13 20:05:44,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3413 states, 3412 states have (on average 3.8710433763188745) internal successors, (13208), 3412 states have internal predecessors, (13208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:44,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3413 states to 3413 states and 13208 transitions. [2021-07-13 20:05:44,356 INFO L78 Accepts]: Start accepts. Automaton has 3413 states and 13208 transitions. Word has length 24 [2021-07-13 20:05:44,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:44,356 INFO L482 AbstractCegarLoop]: Abstraction has 3413 states and 13208 transitions. [2021-07-13 20:05:44,356 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:44,356 INFO L276 IsEmpty]: Start isEmpty. Operand 3413 states and 13208 transitions. [2021-07-13 20:05:44,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:44,363 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:44,363 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:44,580 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 340 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable675 [2021-07-13 20:05:44,581 INFO L430 AbstractCegarLoop]: === Iteration 352 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:44,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:44,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1891928856, now seen corresponding path program 215 times [2021-07-13 20:05:44,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:44,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391232953] [2021-07-13 20:05:44,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:44,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:44,844 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:44,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:44,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391232953] [2021-07-13 20:05:44,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391232953] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:44,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53987431] [2021-07-13 20:05:44,844 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 341 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 341 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:44,885 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:05:44,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:44,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:44,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:45,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:05:45,083 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:45,085 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:45,086 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:45,086 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:05:45,123 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:45,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53987431] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:45,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:45,123 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:05:45,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116460100] [2021-07-13 20:05:45,123 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:45,123 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:45,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:45,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:45,124 INFO L87 Difference]: Start difference. First operand 3413 states and 13208 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:46,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:46,753 INFO L93 Difference]: Finished difference Result 3852 states and 14553 transitions. [2021-07-13 20:05:46,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:05:46,754 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:46,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:46,764 INFO L225 Difference]: With dead ends: 3852 [2021-07-13 20:05:46,764 INFO L226 Difference]: Without dead ends: 3843 [2021-07-13 20:05:46,765 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 1371.7ms TimeCoverageRelationStatistics Valid=274, Invalid=1532, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:05:46,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3843 states. [2021-07-13 20:05:46,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3843 to 3410. [2021-07-13 20:05:46,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3410 states, 3409 states have (on average 3.8712232326195366) internal successors, (13197), 3409 states have internal predecessors, (13197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:46,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3410 states to 3410 states and 13197 transitions. [2021-07-13 20:05:46,843 INFO L78 Accepts]: Start accepts. Automaton has 3410 states and 13197 transitions. Word has length 24 [2021-07-13 20:05:46,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:46,844 INFO L482 AbstractCegarLoop]: Abstraction has 3410 states and 13197 transitions. [2021-07-13 20:05:46,844 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:46,844 INFO L276 IsEmpty]: Start isEmpty. Operand 3410 states and 13197 transitions. [2021-07-13 20:05:46,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:46,849 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:46,849 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:47,050 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 341 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable676 [2021-07-13 20:05:47,050 INFO L430 AbstractCegarLoop]: === Iteration 353 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:47,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:47,051 INFO L82 PathProgramCache]: Analyzing trace with hash 1425885276, now seen corresponding path program 216 times [2021-07-13 20:05:47,051 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:47,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64768277] [2021-07-13 20:05:47,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:47,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:47,325 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:47,325 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:47,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64768277] [2021-07-13 20:05:47,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64768277] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:47,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [487145274] [2021-07-13 20:05:47,325 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 342 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 342 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:47,361 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:05:47,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:47,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:47,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:47,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:47,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:47,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:47,631 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:47,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 42 [2021-07-13 20:05:47,634 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 20:05:47,644 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:47,646 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:47,646 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:40, output treesize:21 [2021-07-13 20:05:47,737 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:47,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [487145274] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:47,737 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:47,737 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 20:05:47,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292145521] [2021-07-13 20:05:47,738 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 20:05:47,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:47,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 20:05:47,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2021-07-13 20:05:47,738 INFO L87 Difference]: Start difference. First operand 3410 states and 13197 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:48,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:48,968 INFO L93 Difference]: Finished difference Result 3929 states and 14813 transitions. [2021-07-13 20:05:48,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 20:05:48,968 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:48,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:48,977 INFO L225 Difference]: With dead ends: 3929 [2021-07-13 20:05:48,977 INFO L226 Difference]: Without dead ends: 3911 [2021-07-13 20:05:48,978 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 1110.6ms TimeCoverageRelationStatistics Valid=256, Invalid=1466, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 20:05:48,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3911 states. [2021-07-13 20:05:49,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3911 to 3411. [2021-07-13 20:05:49,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3411 states, 3410 states have (on average 3.8712609970674485) internal successors, (13201), 3410 states have internal predecessors, (13201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:49,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3411 states to 3411 states and 13201 transitions. [2021-07-13 20:05:49,037 INFO L78 Accepts]: Start accepts. Automaton has 3411 states and 13201 transitions. Word has length 24 [2021-07-13 20:05:49,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:49,038 INFO L482 AbstractCegarLoop]: Abstraction has 3411 states and 13201 transitions. [2021-07-13 20:05:49,038 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:49,038 INFO L276 IsEmpty]: Start isEmpty. Operand 3411 states and 13201 transitions. [2021-07-13 20:05:49,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:49,043 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:49,044 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:49,244 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable677,342 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:49,244 INFO L430 AbstractCegarLoop]: === Iteration 354 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:49,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:49,245 INFO L82 PathProgramCache]: Analyzing trace with hash -82196782, now seen corresponding path program 217 times [2021-07-13 20:05:49,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:49,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379684749] [2021-07-13 20:05:49,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:49,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:49,514 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:49,514 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:49,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379684749] [2021-07-13 20:05:49,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379684749] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:49,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893321014] [2021-07-13 20:05:49,514 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 343 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 343 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:49,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:49,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:49,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:49,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:05:49,741 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:49,743 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:49,743 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:49,744 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:05:49,782 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:49,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893321014] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:49,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:49,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:05:49,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227517048] [2021-07-13 20:05:49,783 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:49,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:49,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:49,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:49,783 INFO L87 Difference]: Start difference. First operand 3411 states and 13201 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:51,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:51,563 INFO L93 Difference]: Finished difference Result 3959 states and 14910 transitions. [2021-07-13 20:05:51,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 20:05:51,564 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:51,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:51,574 INFO L225 Difference]: With dead ends: 3959 [2021-07-13 20:05:51,574 INFO L226 Difference]: Without dead ends: 3940 [2021-07-13 20:05:51,575 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 1432.0ms TimeCoverageRelationStatistics Valid=304, Invalid=1676, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 20:05:51,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3940 states. [2021-07-13 20:05:51,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3940 to 3414. [2021-07-13 20:05:51,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3414 states, 3413 states have (on average 3.8702021681804863) internal successors, (13209), 3413 states have internal predecessors, (13209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:51,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3414 states to 3414 states and 13209 transitions. [2021-07-13 20:05:51,644 INFO L78 Accepts]: Start accepts. Automaton has 3414 states and 13209 transitions. Word has length 24 [2021-07-13 20:05:51,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:51,644 INFO L482 AbstractCegarLoop]: Abstraction has 3414 states and 13209 transitions. [2021-07-13 20:05:51,645 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:51,645 INFO L276 IsEmpty]: Start isEmpty. Operand 3414 states and 13209 transitions. [2021-07-13 20:05:51,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:51,652 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:51,652 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:51,857 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable681,343 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:51,857 INFO L430 AbstractCegarLoop]: === Iteration 355 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:51,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:51,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1854046730, now seen corresponding path program 218 times [2021-07-13 20:05:51,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:51,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827011142] [2021-07-13 20:05:51,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:51,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:52,145 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:52,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:52,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827011142] [2021-07-13 20:05:52,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827011142] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:52,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220910390] [2021-07-13 20:05:52,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 344 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 344 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:52,180 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:05:52,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:52,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:05:52,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:52,383 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:52,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 28 [2021-07-13 20:05:52,385 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:52,396 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:52,396 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:52,397 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:25 [2021-07-13 20:05:52,478 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:52,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [220910390] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:52,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:52,479 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-07-13 20:05:52,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209887215] [2021-07-13 20:05:52,479 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:05:52,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:52,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:05:52,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:05:52,480 INFO L87 Difference]: Start difference. First operand 3414 states and 13209 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:53,009 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 48 [2021-07-13 20:05:54,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:54,634 INFO L93 Difference]: Finished difference Result 3982 states and 14970 transitions. [2021-07-13 20:05:54,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 20:05:54,634 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:54,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:54,645 INFO L225 Difference]: With dead ends: 3982 [2021-07-13 20:05:54,645 INFO L226 Difference]: Without dead ends: 3963 [2021-07-13 20:05:54,645 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 1910.6ms TimeCoverageRelationStatistics Valid=440, Invalid=2110, Unknown=0, NotChecked=0, Total=2550 [2021-07-13 20:05:54,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3963 states. [2021-07-13 20:05:54,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3963 to 3412. [2021-07-13 20:05:54,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3412 states, 3411 states have (on average 3.871298739372618) internal successors, (13205), 3411 states have internal predecessors, (13205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:54,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3412 states to 3412 states and 13205 transitions. [2021-07-13 20:05:54,721 INFO L78 Accepts]: Start accepts. Automaton has 3412 states and 13205 transitions. Word has length 24 [2021-07-13 20:05:54,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:54,721 INFO L482 AbstractCegarLoop]: Abstraction has 3412 states and 13205 transitions. [2021-07-13 20:05:54,721 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:54,721 INFO L276 IsEmpty]: Start isEmpty. Operand 3412 states and 13205 transitions. [2021-07-13 20:05:54,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:54,728 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:54,728 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:54,952 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable682,344 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:54,952 INFO L430 AbstractCegarLoop]: === Iteration 356 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:54,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:54,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1677505298, now seen corresponding path program 219 times [2021-07-13 20:05:54,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:54,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348359439] [2021-07-13 20:05:54,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:54,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:55,225 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:55,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:55,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348359439] [2021-07-13 20:05:55,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1348359439] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:55,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615154632] [2021-07-13 20:05:55,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 345 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 345 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:55,255 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:05:55,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:55,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:05:55,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:55,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:05:55,491 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:05:55,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:05:55,492 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:55,499 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:55,500 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:55,500 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:7 [2021-07-13 20:05:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:55,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615154632] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:55,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:55,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:05:55,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341960345] [2021-07-13 20:05:55,567 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:55,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:55,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:55,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:55,567 INFO L87 Difference]: Start difference. First operand 3412 states and 13205 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:56,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:56,950 INFO L93 Difference]: Finished difference Result 3864 states and 14615 transitions. [2021-07-13 20:05:56,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 20:05:56,950 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:56,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:56,960 INFO L225 Difference]: With dead ends: 3864 [2021-07-13 20:05:56,960 INFO L226 Difference]: Without dead ends: 3855 [2021-07-13 20:05:56,961 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 1273.0ms TimeCoverageRelationStatistics Valid=293, Invalid=1347, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:05:56,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3855 states. [2021-07-13 20:05:57,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3855 to 3415. [2021-07-13 20:05:57,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3415 states, 3414 states have (on average 3.8708260105448153) internal successors, (13215), 3414 states have internal predecessors, (13215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:57,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3415 states to 3415 states and 13215 transitions. [2021-07-13 20:05:57,037 INFO L78 Accepts]: Start accepts. Automaton has 3415 states and 13215 transitions. Word has length 24 [2021-07-13 20:05:57,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:57,037 INFO L482 AbstractCegarLoop]: Abstraction has 3415 states and 13215 transitions. [2021-07-13 20:05:57,037 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:57,037 INFO L276 IsEmpty]: Start isEmpty. Operand 3415 states and 13215 transitions. [2021-07-13 20:05:57,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:57,044 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:57,045 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:57,267 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 345 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable685 [2021-07-13 20:05:57,267 INFO L430 AbstractCegarLoop]: === Iteration 357 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:57,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:57,268 INFO L82 PathProgramCache]: Analyzing trace with hash 843766858, now seen corresponding path program 220 times [2021-07-13 20:05:57,268 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:57,268 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576572804] [2021-07-13 20:05:57,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:57,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:57,528 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:57,528 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:57,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576572804] [2021-07-13 20:05:57,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576572804] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:57,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624959955] [2021-07-13 20:05:57,528 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 346 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 346 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:57,565 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:05:57,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:57,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:57,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:57,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:05:57,713 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:57,716 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:57,717 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:57,717 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:05:57,774 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:57,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624959955] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:57,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:57,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:05:57,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494705615] [2021-07-13 20:05:57,774 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:05:57,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:57,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:05:57,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:05:57,775 INFO L87 Difference]: Start difference. First operand 3415 states and 13215 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:59,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:05:59,058 INFO L93 Difference]: Finished difference Result 3851 states and 14577 transitions. [2021-07-13 20:05:59,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 20:05:59,058 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:05:59,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:05:59,068 INFO L225 Difference]: With dead ends: 3851 [2021-07-13 20:05:59,068 INFO L226 Difference]: Without dead ends: 3841 [2021-07-13 20:05:59,069 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1069.3ms TimeCoverageRelationStatistics Valid=240, Invalid=1166, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 20:05:59,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3841 states. [2021-07-13 20:05:59,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3841 to 3411. [2021-07-13 20:05:59,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3411 states, 3410 states have (on average 3.8712609970674485) internal successors, (13201), 3410 states have internal predecessors, (13201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:59,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3411 states to 3411 states and 13201 transitions. [2021-07-13 20:05:59,166 INFO L78 Accepts]: Start accepts. Automaton has 3411 states and 13201 transitions. Word has length 24 [2021-07-13 20:05:59,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:05:59,166 INFO L482 AbstractCegarLoop]: Abstraction has 3411 states and 13201 transitions. [2021-07-13 20:05:59,166 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:05:59,166 INFO L276 IsEmpty]: Start isEmpty. Operand 3411 states and 13201 transitions. [2021-07-13 20:05:59,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:05:59,173 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:05:59,173 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:05:59,396 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 346 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable686 [2021-07-13 20:05:59,396 INFO L430 AbstractCegarLoop]: === Iteration 358 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:05:59,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:05:59,397 INFO L82 PathProgramCache]: Analyzing trace with hash 564954386, now seen corresponding path program 221 times [2021-07-13 20:05:59,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:05:59,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31192501] [2021-07-13 20:05:59,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:05:59,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:05:59,693 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:59,694 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:05:59,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31192501] [2021-07-13 20:05:59,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31192501] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:59,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458169460] [2021-07-13 20:05:59,694 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 347 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 347 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:05:59,728 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:05:59,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:05:59,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:05:59,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:05:59,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:05:59,916 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:05:59,918 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:05:59,918 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:05:59,919 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:05:59,956 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:05:59,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458169460] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:05:59,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:05:59,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:05:59,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383432435] [2021-07-13 20:05:59,956 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:05:59,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:05:59,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:05:59,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:05:59,957 INFO L87 Difference]: Start difference. First operand 3411 states and 13201 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:01,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:01,486 INFO L93 Difference]: Finished difference Result 3840 states and 14522 transitions. [2021-07-13 20:06:01,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 20:06:01,486 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:01,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:01,497 INFO L225 Difference]: With dead ends: 3840 [2021-07-13 20:06:01,498 INFO L226 Difference]: Without dead ends: 3831 [2021-07-13 20:06:01,498 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 1228.7ms TimeCoverageRelationStatistics Valid=269, Invalid=1537, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:06:01,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3831 states. [2021-07-13 20:06:01,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3831 to 3412. [2021-07-13 20:06:01,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3412 states, 3411 states have (on average 3.871298739372618) internal successors, (13205), 3411 states have internal predecessors, (13205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:01,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3412 states to 3412 states and 13205 transitions. [2021-07-13 20:06:01,567 INFO L78 Accepts]: Start accepts. Automaton has 3412 states and 13205 transitions. Word has length 24 [2021-07-13 20:06:01,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:01,567 INFO L482 AbstractCegarLoop]: Abstraction has 3412 states and 13205 transitions. [2021-07-13 20:06:01,567 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:01,567 INFO L276 IsEmpty]: Start isEmpty. Operand 3412 states and 13205 transitions. [2021-07-13 20:06:01,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:01,574 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:01,574 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:01,785 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 347 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable687 [2021-07-13 20:06:01,785 INFO L430 AbstractCegarLoop]: === Iteration 359 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:01,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:01,785 INFO L82 PathProgramCache]: Analyzing trace with hash -2001341164, now seen corresponding path program 222 times [2021-07-13 20:06:01,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:01,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869737853] [2021-07-13 20:06:01,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:01,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:02,089 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:02,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:02,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869737853] [2021-07-13 20:06:02,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869737853] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:02,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842195371] [2021-07-13 20:06:02,090 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 348 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 348 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:02,125 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 20:06:02,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:02,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:02,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:02,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:06:02,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:06:02,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:06:02,450 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:02,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 42 [2021-07-13 20:06:02,454 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 20:06:02,464 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:02,467 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:02,467 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:40, output treesize:21 [2021-07-13 20:06:02,575 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:02,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842195371] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:02,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:02,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 20:06:02,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721445453] [2021-07-13 20:06:02,575 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 20:06:02,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:02,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 20:06:02,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2021-07-13 20:06:02,576 INFO L87 Difference]: Start difference. First operand 3412 states and 13205 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:03,069 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2021-07-13 20:06:04,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:04,138 INFO L93 Difference]: Finished difference Result 3889 states and 14648 transitions. [2021-07-13 20:06:04,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-07-13 20:06:04,139 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:04,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:04,150 INFO L225 Difference]: With dead ends: 3889 [2021-07-13 20:06:04,150 INFO L226 Difference]: Without dead ends: 3870 [2021-07-13 20:06:04,150 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1376.3ms TimeCoverageRelationStatistics Valid=244, Invalid=1396, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:06:04,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3870 states. [2021-07-13 20:06:04,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3870 to 3413. [2021-07-13 20:06:04,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3413 states, 3412 states have (on average 3.8713364595545134) internal successors, (13209), 3412 states have internal predecessors, (13209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:04,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3413 states to 3413 states and 13209 transitions. [2021-07-13 20:06:04,227 INFO L78 Accepts]: Start accepts. Automaton has 3413 states and 13209 transitions. Word has length 24 [2021-07-13 20:06:04,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:04,227 INFO L482 AbstractCegarLoop]: Abstraction has 3413 states and 13209 transitions. [2021-07-13 20:06:04,227 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:04,228 INFO L276 IsEmpty]: Start isEmpty. Operand 3413 states and 13209 transitions. [2021-07-13 20:06:04,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:04,234 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:04,235 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:04,458 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable688,348 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:04,458 INFO L430 AbstractCegarLoop]: === Iteration 360 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:04,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:04,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1265476272, now seen corresponding path program 223 times [2021-07-13 20:06:04,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:04,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362539637] [2021-07-13 20:06:04,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:04,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:04,695 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:04,696 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:04,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362539637] [2021-07-13 20:06:04,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362539637] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:04,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208734297] [2021-07-13 20:06:04,696 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 349 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 349 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:04,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:04,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:04,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:04,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:06:04,950 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:04,953 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:04,954 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:04,954 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:06:05,014 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:05,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1208734297] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:05,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:05,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:06:05,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272689982] [2021-07-13 20:06:05,015 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:06:05,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:05,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:06:05,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:06:05,015 INFO L87 Difference]: Start difference. First operand 3413 states and 13209 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:06,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:06,313 INFO L93 Difference]: Finished difference Result 3870 states and 14613 transitions. [2021-07-13 20:06:06,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-07-13 20:06:06,314 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:06,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:06,324 INFO L225 Difference]: With dead ends: 3870 [2021-07-13 20:06:06,324 INFO L226 Difference]: Without dead ends: 3861 [2021-07-13 20:06:06,325 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 1113.9ms TimeCoverageRelationStatistics Valid=277, Invalid=1445, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 20:06:06,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3861 states. [2021-07-13 20:06:06,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3861 to 3416. [2021-07-13 20:06:06,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3416 states, 3415 states have (on average 3.8708638360175693) internal successors, (13219), 3415 states have internal predecessors, (13219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:06,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3416 states to 3416 states and 13219 transitions. [2021-07-13 20:06:06,393 INFO L78 Accepts]: Start accepts. Automaton has 3416 states and 13219 transitions. Word has length 24 [2021-07-13 20:06:06,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:06,394 INFO L482 AbstractCegarLoop]: Abstraction has 3416 states and 13219 transitions. [2021-07-13 20:06:06,394 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:06,394 INFO L276 IsEmpty]: Start isEmpty. Operand 3416 states and 13219 transitions. [2021-07-13 20:06:06,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:06,400 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:06,400 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:06,623 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable692,349 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:06,623 INFO L430 AbstractCegarLoop]: === Iteration 361 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:06,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:06,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1589062450, now seen corresponding path program 224 times [2021-07-13 20:06:06,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:06,623 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28041080] [2021-07-13 20:06:06,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:06,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:06,872 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:06,872 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:06,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28041080] [2021-07-13 20:06:06,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28041080] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:06,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711804946] [2021-07-13 20:06:06,873 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 350 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 350 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:06,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:06:06,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:06,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:06:06,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:07,087 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:07,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:06:07,088 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:07,099 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:07,100 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:07,100 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:06:07,218 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:07,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711804946] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:07,218 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:07,218 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:06:07,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224883308] [2021-07-13 20:06:07,218 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:06:07,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:07,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:06:07,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:06:07,219 INFO L87 Difference]: Start difference. First operand 3416 states and 13219 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:07,850 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 27 [2021-07-13 20:06:08,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:08,709 INFO L93 Difference]: Finished difference Result 3861 states and 14586 transitions. [2021-07-13 20:06:08,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:06:08,709 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:08,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:08,720 INFO L225 Difference]: With dead ends: 3861 [2021-07-13 20:06:08,720 INFO L226 Difference]: Without dead ends: 3848 [2021-07-13 20:06:08,720 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 1286.1ms TimeCoverageRelationStatistics Valid=261, Invalid=1461, Unknown=0, NotChecked=0, Total=1722 [2021-07-13 20:06:08,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3848 states. [2021-07-13 20:06:08,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3848 to 3411. [2021-07-13 20:06:08,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3411 states, 3410 states have (on average 3.8712609970674485) internal successors, (13201), 3410 states have internal predecessors, (13201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:08,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3411 states to 3411 states and 13201 transitions. [2021-07-13 20:06:08,793 INFO L78 Accepts]: Start accepts. Automaton has 3411 states and 13201 transitions. Word has length 24 [2021-07-13 20:06:08,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:08,793 INFO L482 AbstractCegarLoop]: Abstraction has 3411 states and 13201 transitions. [2021-07-13 20:06:08,793 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:08,793 INFO L276 IsEmpty]: Start isEmpty. Operand 3411 states and 13201 transitions. [2021-07-13 20:06:08,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:08,800 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:08,800 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:09,024 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 350 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable693 [2021-07-13 20:06:09,024 INFO L430 AbstractCegarLoop]: === Iteration 362 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:09,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:09,025 INFO L82 PathProgramCache]: Analyzing trace with hash -1707034270, now seen corresponding path program 225 times [2021-07-13 20:06:09,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:09,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309002730] [2021-07-13 20:06:09,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:09,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:09,292 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:09,293 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:09,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309002730] [2021-07-13 20:06:09,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309002730] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:09,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47025739] [2021-07-13 20:06:09,293 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 351 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 351 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:09,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:06:09,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:09,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 32 conjunts are in the unsatisfiable core [2021-07-13 20:06:09,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:09,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:06:09,601 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:09,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 20 treesize of output 44 [2021-07-13 20:06:09,604 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:09,640 INFO L628 ElimStorePlain]: treesize reduction 14, result has 70.2 percent of original size [2021-07-13 20:06:09,643 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:09,643 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:43 [2021-07-13 20:06:09,732 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:09,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47025739] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:09,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:09,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-07-13 20:06:09,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851374750] [2021-07-13 20:06:09,732 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-07-13 20:06:09,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:09,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-07-13 20:06:09,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2021-07-13 20:06:09,733 INFO L87 Difference]: Start difference. First operand 3411 states and 13201 transitions. Second operand has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:11,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:11,185 INFO L93 Difference]: Finished difference Result 3920 states and 14728 transitions. [2021-07-13 20:06:11,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-13 20:06:11,185 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:11,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:11,194 INFO L225 Difference]: With dead ends: 3920 [2021-07-13 20:06:11,194 INFO L226 Difference]: Without dead ends: 3892 [2021-07-13 20:06:11,195 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 1220.5ms TimeCoverageRelationStatistics Valid=264, Invalid=1542, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:06:11,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3892 states. [2021-07-13 20:06:11,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3892 to 3413. [2021-07-13 20:06:11,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3413 states, 3412 states have (on average 3.8707502930832356) internal successors, (13207), 3412 states have internal predecessors, (13207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:11,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3413 states to 3413 states and 13207 transitions. [2021-07-13 20:06:11,259 INFO L78 Accepts]: Start accepts. Automaton has 3413 states and 13207 transitions. Word has length 24 [2021-07-13 20:06:11,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:11,259 INFO L482 AbstractCegarLoop]: Abstraction has 3413 states and 13207 transitions. [2021-07-13 20:06:11,259 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.76) internal successors, (44), 25 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:11,259 INFO L276 IsEmpty]: Start isEmpty. Operand 3413 states and 13207 transitions. [2021-07-13 20:06:11,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:11,265 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:11,265 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:11,477 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 351 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable695 [2021-07-13 20:06:11,477 INFO L430 AbstractCegarLoop]: === Iteration 363 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:11,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:11,478 INFO L82 PathProgramCache]: Analyzing trace with hash -442736788, now seen corresponding path program 226 times [2021-07-13 20:06:11,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:11,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687708707] [2021-07-13 20:06:11,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:11,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:11,728 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:11,728 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:11,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687708707] [2021-07-13 20:06:11,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687708707] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:11,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151317514] [2021-07-13 20:06:11,729 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 352 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 352 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:11,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:06:11,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:11,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:11,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:11,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:06:11,965 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:11,966 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:11,966 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:11,966 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 20:06:12,000 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:12,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151317514] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:12,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:12,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:06:12,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716007342] [2021-07-13 20:06:12,001 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:06:12,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:12,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:06:12,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:06:12,001 INFO L87 Difference]: Start difference. First operand 3413 states and 13207 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:13,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:13,632 INFO L93 Difference]: Finished difference Result 3873 states and 14628 transitions. [2021-07-13 20:06:13,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-07-13 20:06:13,633 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:13,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:13,642 INFO L225 Difference]: With dead ends: 3873 [2021-07-13 20:06:13,642 INFO L226 Difference]: Without dead ends: 3854 [2021-07-13 20:06:13,642 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1273.0ms TimeCoverageRelationStatistics Valid=287, Invalid=1519, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:06:13,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3854 states. [2021-07-13 20:06:13,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3854 to 3412. [2021-07-13 20:06:13,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3412 states, 3411 states have (on average 3.871298739372618) internal successors, (13205), 3411 states have internal predecessors, (13205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:13,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3412 states to 3412 states and 13205 transitions. [2021-07-13 20:06:13,703 INFO L78 Accepts]: Start accepts. Automaton has 3412 states and 13205 transitions. Word has length 24 [2021-07-13 20:06:13,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:13,703 INFO L482 AbstractCegarLoop]: Abstraction has 3412 states and 13205 transitions. [2021-07-13 20:06:13,703 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:13,703 INFO L276 IsEmpty]: Start isEmpty. Operand 3412 states and 13205 transitions. [2021-07-13 20:06:13,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:13,709 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:13,709 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:13,910 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable700,352 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:13,910 INFO L430 AbstractCegarLoop]: === Iteration 364 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:13,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:13,911 INFO L82 PathProgramCache]: Analyzing trace with hash -619278220, now seen corresponding path program 227 times [2021-07-13 20:06:13,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:13,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103646659] [2021-07-13 20:06:13,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:13,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:14,136 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:14,136 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:14,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103646659] [2021-07-13 20:06:14,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103646659] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:14,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034113434] [2021-07-13 20:06:14,136 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 353 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 353 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:14,175 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:06:14,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:14,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:14,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:14,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:06:14,314 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:14,317 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:14,317 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:14,317 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:06:14,370 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:14,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034113434] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:14,371 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:14,371 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:06:14,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498353732] [2021-07-13 20:06:14,371 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:06:14,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:14,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:06:14,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:06:14,371 INFO L87 Difference]: Start difference. First operand 3412 states and 13205 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:15,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:15,259 INFO L93 Difference]: Finished difference Result 3806 states and 14423 transitions. [2021-07-13 20:06:15,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-07-13 20:06:15,260 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:15,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:15,267 INFO L225 Difference]: With dead ends: 3806 [2021-07-13 20:06:15,267 INFO L226 Difference]: Without dead ends: 3797 [2021-07-13 20:06:15,267 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 871.8ms TimeCoverageRelationStatistics Valid=254, Invalid=1152, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 20:06:15,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3797 states. [2021-07-13 20:06:15,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3797 to 3414. [2021-07-13 20:06:15,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3414 states, 3413 states have (on average 3.8713741576325815) internal successors, (13213), 3413 states have internal predecessors, (13213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:15,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3414 states to 3414 states and 13213 transitions. [2021-07-13 20:06:15,325 INFO L78 Accepts]: Start accepts. Automaton has 3414 states and 13213 transitions. Word has length 24 [2021-07-13 20:06:15,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:15,325 INFO L482 AbstractCegarLoop]: Abstraction has 3414 states and 13213 transitions. [2021-07-13 20:06:15,325 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:15,325 INFO L276 IsEmpty]: Start isEmpty. Operand 3414 states and 13213 transitions. [2021-07-13 20:06:15,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:15,331 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:15,331 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:15,553 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 353 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable701 [2021-07-13 20:06:15,553 INFO L430 AbstractCegarLoop]: === Iteration 365 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:15,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:15,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1453016660, now seen corresponding path program 228 times [2021-07-13 20:06:15,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:15,554 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109059387] [2021-07-13 20:06:15,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:15,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:15,798 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:15,798 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:15,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109059387] [2021-07-13 20:06:15,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109059387] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:15,799 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91967303] [2021-07-13 20:06:15,799 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 354 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 354 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:15,833 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 20:06:15,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:15,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:06:15,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:16,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:06:16,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-07-13 20:06:16,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:06:16,022 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:16,028 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:16,029 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:16,029 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:7 [2021-07-13 20:06:16,087 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:16,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91967303] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:16,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:16,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:06:16,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446166521] [2021-07-13 20:06:16,088 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:06:16,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:16,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:06:16,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=417, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:06:16,089 INFO L87 Difference]: Start difference. First operand 3414 states and 13213 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:17,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:17,302 INFO L93 Difference]: Finished difference Result 3783 states and 14356 transitions. [2021-07-13 20:06:17,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 20:06:17,303 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:17,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:17,314 INFO L225 Difference]: With dead ends: 3783 [2021-07-13 20:06:17,314 INFO L226 Difference]: Without dead ends: 3773 [2021-07-13 20:06:17,315 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 1050.8ms TimeCoverageRelationStatistics Valid=248, Invalid=1158, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 20:06:17,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3773 states. [2021-07-13 20:06:17,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3773 to 3411. [2021-07-13 20:06:17,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3411 states, 3410 states have (on average 3.8712609970674485) internal successors, (13201), 3410 states have internal predecessors, (13201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:17,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3411 states to 3411 states and 13201 transitions. [2021-07-13 20:06:17,389 INFO L78 Accepts]: Start accepts. Automaton has 3411 states and 13201 transitions. Word has length 24 [2021-07-13 20:06:17,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:17,389 INFO L482 AbstractCegarLoop]: Abstraction has 3411 states and 13201 transitions. [2021-07-13 20:06:17,389 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:17,389 INFO L276 IsEmpty]: Start isEmpty. Operand 3411 states and 13201 transitions. [2021-07-13 20:06:17,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:17,397 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:17,397 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:17,613 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable702,354 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:17,614 INFO L430 AbstractCegarLoop]: === Iteration 366 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:17,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:17,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1240546540, now seen corresponding path program 229 times [2021-07-13 20:06:17,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:17,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913929520] [2021-07-13 20:06:17,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:17,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:17,928 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:17,928 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:17,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913929520] [2021-07-13 20:06:17,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913929520] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:17,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337694593] [2021-07-13 20:06:17,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 355 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 355 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:17,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:17,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:17,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:18,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:06:18,153 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:18,155 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:18,155 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:18,155 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:7 [2021-07-13 20:06:18,192 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:18,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337694593] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:18,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:18,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:06:18,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972494647] [2021-07-13 20:06:18,193 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:06:18,193 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:18,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:06:18,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:06:18,193 INFO L87 Difference]: Start difference. First operand 3411 states and 13201 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:19,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:19,492 INFO L93 Difference]: Finished difference Result 3883 states and 14653 transitions. [2021-07-13 20:06:19,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 20:06:19,493 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:19,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:19,501 INFO L225 Difference]: With dead ends: 3883 [2021-07-13 20:06:19,501 INFO L226 Difference]: Without dead ends: 3864 [2021-07-13 20:06:19,501 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 1042.8ms TimeCoverageRelationStatistics Valid=246, Invalid=1394, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:06:19,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3864 states. [2021-07-13 20:06:19,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3864 to 3411. [2021-07-13 20:06:19,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3411 states, 3410 states have (on average 3.8712609970674485) internal successors, (13201), 3410 states have internal predecessors, (13201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:19,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3411 states to 3411 states and 13201 transitions. [2021-07-13 20:06:19,560 INFO L78 Accepts]: Start accepts. Automaton has 3411 states and 13201 transitions. Word has length 24 [2021-07-13 20:06:19,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:19,560 INFO L482 AbstractCegarLoop]: Abstraction has 3411 states and 13201 transitions. [2021-07-13 20:06:19,560 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:19,560 INFO L276 IsEmpty]: Start isEmpty. Operand 3411 states and 13201 transitions. [2021-07-13 20:06:19,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:19,570 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:19,570 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:19,770 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable703,355 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:19,771 INFO L430 AbstractCegarLoop]: === Iteration 367 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:19,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:19,772 INFO L82 PathProgramCache]: Analyzing trace with hash 212396680, now seen corresponding path program 230 times [2021-07-13 20:06:19,772 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:19,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760985964] [2021-07-13 20:06:19,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:19,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:19,999 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:19,999 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:19,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760985964] [2021-07-13 20:06:19,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760985964] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:19,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531776098] [2021-07-13 20:06:19,999 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 356 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 356 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:20,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:06:20,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:20,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:06:20,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:20,262 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:20,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:06:20,263 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:20,275 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:20,276 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:20,276 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:06:20,380 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:20,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531776098] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:20,380 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:20,380 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:06:20,381 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899149267] [2021-07-13 20:06:20,381 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:06:20,381 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:20,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:06:20,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:06:20,381 INFO L87 Difference]: Start difference. First operand 3411 states and 13201 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:21,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:21,681 INFO L93 Difference]: Finished difference Result 3872 states and 14637 transitions. [2021-07-13 20:06:21,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-13 20:06:21,681 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:21,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:21,690 INFO L225 Difference]: With dead ends: 3872 [2021-07-13 20:06:21,690 INFO L226 Difference]: Without dead ends: 3862 [2021-07-13 20:06:21,691 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 477 ImplicationChecksByTransitivity, 1133.4ms TimeCoverageRelationStatistics Valid=279, Invalid=1527, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:06:21,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3862 states. [2021-07-13 20:06:21,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3862 to 3414. [2021-07-13 20:06:21,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3414 states, 3413 states have (on average 3.8710811602695574) internal successors, (13212), 3413 states have internal predecessors, (13212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:21,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3414 states to 3414 states and 13212 transitions. [2021-07-13 20:06:21,763 INFO L78 Accepts]: Start accepts. Automaton has 3414 states and 13212 transitions. Word has length 24 [2021-07-13 20:06:21,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:21,764 INFO L482 AbstractCegarLoop]: Abstraction has 3414 states and 13212 transitions. [2021-07-13 20:06:21,764 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:21,764 INFO L276 IsEmpty]: Start isEmpty. Operand 3414 states and 13212 transitions. [2021-07-13 20:06:21,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:21,771 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:21,771 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:21,994 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable704,356 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:21,994 INFO L430 AbstractCegarLoop]: === Iteration 368 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:21,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:21,994 INFO L82 PathProgramCache]: Analyzing trace with hash 535982858, now seen corresponding path program 231 times [2021-07-13 20:06:21,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:21,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424544598] [2021-07-13 20:06:21,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:21,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:22,237 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:22,237 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:22,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424544598] [2021-07-13 20:06:22,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424544598] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:22,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025448086] [2021-07-13 20:06:22,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 357 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 357 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:22,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 20:06:22,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:22,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 35 conjunts are in the unsatisfiable core [2021-07-13 20:06:22,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:22,456 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:22,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 37 [2021-07-13 20:06:22,458 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:22,475 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:22,476 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:22,476 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:37 [2021-07-13 20:06:22,776 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:22,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025448086] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:22,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:22,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 20:06:22,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946371812] [2021-07-13 20:06:22,776 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:06:22,776 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:22,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:06:22,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:06:22,777 INFO L87 Difference]: Start difference. First operand 3414 states and 13212 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:23,351 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 49 [2021-07-13 20:06:23,674 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 49 [2021-07-13 20:06:25,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:25,063 INFO L93 Difference]: Finished difference Result 4016 states and 14984 transitions. [2021-07-13 20:06:25,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-07-13 20:06:25,064 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:25,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:25,073 INFO L225 Difference]: With dead ends: 4016 [2021-07-13 20:06:25,073 INFO L226 Difference]: Without dead ends: 3997 [2021-07-13 20:06:25,073 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 759 ImplicationChecksByTransitivity, 2164.1ms TimeCoverageRelationStatistics Valid=413, Invalid=2343, Unknown=0, NotChecked=0, Total=2756 [2021-07-13 20:06:25,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3997 states. [2021-07-13 20:06:25,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3997 to 3426. [2021-07-13 20:06:25,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3426 states, 3425 states have (on average 3.8703649635036497) internal successors, (13256), 3425 states have internal predecessors, (13256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:25,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3426 states to 3426 states and 13256 transitions. [2021-07-13 20:06:25,157 INFO L78 Accepts]: Start accepts. Automaton has 3426 states and 13256 transitions. Word has length 24 [2021-07-13 20:06:25,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:25,158 INFO L482 AbstractCegarLoop]: Abstraction has 3426 states and 13256 transitions. [2021-07-13 20:06:25,158 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:25,158 INFO L276 IsEmpty]: Start isEmpty. Operand 3426 states and 13256 transitions. [2021-07-13 20:06:25,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:25,164 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:25,165 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:25,386 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable706,357 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:25,387 INFO L430 AbstractCegarLoop]: === Iteration 369 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:25,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:25,387 INFO L82 PathProgramCache]: Analyzing trace with hash -2073240316, now seen corresponding path program 232 times [2021-07-13 20:06:25,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:25,387 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562643385] [2021-07-13 20:06:25,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:25,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:25,666 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:25,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:25,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562643385] [2021-07-13 20:06:25,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562643385] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:25,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701364244] [2021-07-13 20:06:25,667 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 358 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 358 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:25,702 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:06:25,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:25,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:25,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:25,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:06:25,856 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:25,859 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:25,860 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:25,860 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:06:25,910 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:25,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701364244] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:25,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:25,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2021-07-13 20:06:25,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685930341] [2021-07-13 20:06:25,910 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-13 20:06:25,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:25,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-13 20:06:25,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-07-13 20:06:25,911 INFO L87 Difference]: Start difference. First operand 3426 states and 13256 transitions. Second operand has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:26,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:26,888 INFO L93 Difference]: Finished difference Result 3782 states and 14374 transitions. [2021-07-13 20:06:26,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-13 20:06:26,889 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:26,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:26,897 INFO L225 Difference]: With dead ends: 3782 [2021-07-13 20:06:26,897 INFO L226 Difference]: Without dead ends: 3767 [2021-07-13 20:06:26,898 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 864.2ms TimeCoverageRelationStatistics Valid=221, Invalid=1185, Unknown=0, NotChecked=0, Total=1406 [2021-07-13 20:06:26,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3767 states. [2021-07-13 20:06:26,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3767 to 3420. [2021-07-13 20:06:26,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3420 states, 3419 states have (on average 3.870722433460076) internal successors, (13234), 3419 states have internal predecessors, (13234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:26,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3420 states to 3420 states and 13234 transitions. [2021-07-13 20:06:26,955 INFO L78 Accepts]: Start accepts. Automaton has 3420 states and 13234 transitions. Word has length 24 [2021-07-13 20:06:26,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:26,956 INFO L482 AbstractCegarLoop]: Abstraction has 3420 states and 13234 transitions. [2021-07-13 20:06:26,956 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 21 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:26,956 INFO L276 IsEmpty]: Start isEmpty. Operand 3420 states and 13234 transitions. [2021-07-13 20:06:26,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:26,961 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:26,962 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:27,162 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable715,358 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:27,162 INFO L430 AbstractCegarLoop]: === Iteration 370 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:27,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:27,162 INFO L82 PathProgramCache]: Analyzing trace with hash 1859993244, now seen corresponding path program 233 times [2021-07-13 20:06:27,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:27,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422833270] [2021-07-13 20:06:27,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:27,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:27,365 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:27,366 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:27,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422833270] [2021-07-13 20:06:27,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422833270] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:27,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228699206] [2021-07-13 20:06:27,366 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 359 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 359 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:27,400 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 20:06:27,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:27,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:27,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:27,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-07-13 20:06:27,587 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:27,589 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:27,589 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:27,589 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:5 [2021-07-13 20:06:27,617 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:27,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228699206] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:27,617 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:27,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2021-07-13 20:06:27,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011576299] [2021-07-13 20:06:27,618 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:06:27,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:27,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:06:27,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:06:27,618 INFO L87 Difference]: Start difference. First operand 3420 states and 13234 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:28,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:28,734 INFO L93 Difference]: Finished difference Result 3906 states and 14738 transitions. [2021-07-13 20:06:28,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-13 20:06:28,734 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:28,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:28,742 INFO L225 Difference]: With dead ends: 3906 [2021-07-13 20:06:28,742 INFO L226 Difference]: Without dead ends: 3887 [2021-07-13 20:06:28,742 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 933.5ms TimeCoverageRelationStatistics Valid=263, Invalid=1377, Unknown=0, NotChecked=0, Total=1640 [2021-07-13 20:06:28,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3887 states. [2021-07-13 20:06:28,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3887 to 3420. [2021-07-13 20:06:28,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3420 states, 3419 states have (on average 3.870722433460076) internal successors, (13234), 3419 states have internal predecessors, (13234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:28,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3420 states to 3420 states and 13234 transitions. [2021-07-13 20:06:28,799 INFO L78 Accepts]: Start accepts. Automaton has 3420 states and 13234 transitions. Word has length 24 [2021-07-13 20:06:28,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:28,799 INFO L482 AbstractCegarLoop]: Abstraction has 3420 states and 13234 transitions. [2021-07-13 20:06:28,799 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:28,799 INFO L276 IsEmpty]: Start isEmpty. Operand 3420 states and 13234 transitions. [2021-07-13 20:06:28,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:28,805 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:28,805 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:29,006 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 359 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable716 [2021-07-13 20:06:29,006 INFO L430 AbstractCegarLoop]: === Iteration 371 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:29,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:29,006 INFO L82 PathProgramCache]: Analyzing trace with hash 2077418130, now seen corresponding path program 234 times [2021-07-13 20:06:29,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:29,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777801995] [2021-07-13 20:06:29,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:29,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:29,201 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:29,201 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:29,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777801995] [2021-07-13 20:06:29,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1777801995] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:29,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479866882] [2021-07-13 20:06:29,202 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 360 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 360 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:29,231 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 20:06:29,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:29,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:06:29,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:29,367 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:29,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:06:29,369 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:29,379 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:29,380 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:29,380 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:26 [2021-07-13 20:06:29,489 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:29,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479866882] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:29,489 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:29,489 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:06:29,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433043202] [2021-07-13 20:06:29,490 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:06:29,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:29,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:06:29,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:06:29,490 INFO L87 Difference]: Start difference. First operand 3420 states and 13234 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:30,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:30,768 INFO L93 Difference]: Finished difference Result 3932 states and 14799 transitions. [2021-07-13 20:06:30,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-07-13 20:06:30,769 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:30,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:30,777 INFO L225 Difference]: With dead ends: 3932 [2021-07-13 20:06:30,777 INFO L226 Difference]: Without dead ends: 3913 [2021-07-13 20:06:30,777 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 1183.3ms TimeCoverageRelationStatistics Valid=368, Invalid=1612, Unknown=0, NotChecked=0, Total=1980 [2021-07-13 20:06:30,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3913 states. [2021-07-13 20:06:30,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3913 to 3425. [2021-07-13 20:06:30,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3425 states, 3424 states have (on average 3.8703271028037385) internal successors, (13252), 3424 states have internal predecessors, (13252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:30,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3425 states to 3425 states and 13252 transitions. [2021-07-13 20:06:30,835 INFO L78 Accepts]: Start accepts. Automaton has 3425 states and 13252 transitions. Word has length 24 [2021-07-13 20:06:30,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:30,835 INFO L482 AbstractCegarLoop]: Abstraction has 3425 states and 13252 transitions. [2021-07-13 20:06:30,835 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:30,835 INFO L276 IsEmpty]: Start isEmpty. Operand 3425 states and 13252 transitions. [2021-07-13 20:06:30,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:30,841 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:30,842 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:31,042 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable717,360 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:31,042 INFO L430 AbstractCegarLoop]: === Iteration 372 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:31,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:31,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1243679690, now seen corresponding path program 235 times [2021-07-13 20:06:31,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:31,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397226792] [2021-07-13 20:06:31,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:31,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:31,244 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:31,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:31,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397226792] [2021-07-13 20:06:31,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397226792] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:31,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177966958] [2021-07-13 20:06:31,244 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 361 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 361 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:31,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:31,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:31,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:31,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-07-13 20:06:31,392 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:31,395 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:31,396 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:31,396 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:7 [2021-07-13 20:06:31,443 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:31,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177966958] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:31,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:31,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-07-13 20:06:31,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482889434] [2021-07-13 20:06:31,444 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-07-13 20:06:31,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:31,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-07-13 20:06:31,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-07-13 20:06:31,444 INFO L87 Difference]: Start difference. First operand 3425 states and 13252 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:32,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:32,246 INFO L93 Difference]: Finished difference Result 3894 states and 14709 transitions. [2021-07-13 20:06:32,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-07-13 20:06:32,247 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:32,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:32,254 INFO L225 Difference]: With dead ends: 3894 [2021-07-13 20:06:32,255 INFO L226 Difference]: Without dead ends: 3882 [2021-07-13 20:06:32,255 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 698.6ms TimeCoverageRelationStatistics Valid=215, Invalid=975, Unknown=0, NotChecked=0, Total=1190 [2021-07-13 20:06:32,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3882 states. [2021-07-13 20:06:32,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3882 to 3422. [2021-07-13 20:06:32,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3422 states, 3421 states have (on average 3.8705057000876937) internal successors, (13241), 3421 states have internal predecessors, (13241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:32,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3422 states to 3422 states and 13241 transitions. [2021-07-13 20:06:32,307 INFO L78 Accepts]: Start accepts. Automaton has 3422 states and 13241 transitions. Word has length 24 [2021-07-13 20:06:32,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:32,307 INFO L482 AbstractCegarLoop]: Abstraction has 3422 states and 13241 transitions. [2021-07-13 20:06:32,307 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:32,307 INFO L276 IsEmpty]: Start isEmpty. Operand 3422 states and 13241 transitions. [2021-07-13 20:06:32,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:32,313 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:32,313 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:32,513 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 361 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable720 [2021-07-13 20:06:32,513 INFO L430 AbstractCegarLoop]: === Iteration 373 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:32,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:32,514 INFO L82 PathProgramCache]: Analyzing trace with hash 411054290, now seen corresponding path program 236 times [2021-07-13 20:06:32,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:32,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382866726] [2021-07-13 20:06:32,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:32,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:32,704 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:32,704 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:32,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382866726] [2021-07-13 20:06:32,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382866726] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:32,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107726767] [2021-07-13 20:06:32,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 362 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 362 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:32,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 20:06:32,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:32,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 34 conjunts are in the unsatisfiable core [2021-07-13 20:06:32,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:32,852 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:32,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 29 [2021-07-13 20:06:32,854 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:32,865 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:32,866 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:32,866 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:29 [2021-07-13 20:06:32,983 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:32,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107726767] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:32,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:32,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-07-13 20:06:32,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551161999] [2021-07-13 20:06:32,984 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-07-13 20:06:32,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:32,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-07-13 20:06:32,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-07-13 20:06:32,984 INFO L87 Difference]: Start difference. First operand 3422 states and 13241 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:34,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:34,102 INFO L93 Difference]: Finished difference Result 3835 states and 14527 transitions. [2021-07-13 20:06:34,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-13 20:06:34,102 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:34,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:34,109 INFO L225 Difference]: With dead ends: 3835 [2021-07-13 20:06:34,109 INFO L226 Difference]: Without dead ends: 3826 [2021-07-13 20:06:34,110 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 960.9ms TimeCoverageRelationStatistics Valid=283, Invalid=1523, Unknown=0, NotChecked=0, Total=1806 [2021-07-13 20:06:34,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3826 states. [2021-07-13 20:06:34,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3826 to 3424. [2021-07-13 20:06:34,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3424 states, 3423 states have (on average 3.8702892199824714) internal successors, (13248), 3423 states have internal predecessors, (13248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:34,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3424 states to 3424 states and 13248 transitions. [2021-07-13 20:06:34,161 INFO L78 Accepts]: Start accepts. Automaton has 3424 states and 13248 transitions. Word has length 24 [2021-07-13 20:06:34,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:34,161 INFO L482 AbstractCegarLoop]: Abstraction has 3424 states and 13248 transitions. [2021-07-13 20:06:34,161 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:34,161 INFO L276 IsEmpty]: Start isEmpty. Operand 3424 states and 13248 transitions. [2021-07-13 20:06:34,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:34,166 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:34,166 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 20:06:34,367 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable721,362 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:34,367 INFO L430 AbstractCegarLoop]: === Iteration 374 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:34,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:34,367 INFO L82 PathProgramCache]: Analyzing trace with hash 734640468, now seen corresponding path program 237 times [2021-07-13 20:06:34,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:34,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339042242] [2021-07-13 20:06:34,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:34,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 20:06:34,575 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:34,575 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 20:06:34,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339042242] [2021-07-13 20:06:34,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339042242] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:34,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42839279] [2021-07-13 20:06:34,576 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 363 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 363 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:34,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-13 20:06:34,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:34,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:34,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:34,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-07-13 20:06:34,737 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:34,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 23 treesize of output 49 [2021-07-13 20:06:34,739 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 20:06:34,758 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 20:06:34,758 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 20:06:34,758 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:37, output treesize:49 [2021-07-13 20:06:34,945 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 20:06:34,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42839279] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 20:06:34,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 20:06:34,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-07-13 20:06:34,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425247708] [2021-07-13 20:06:34,945 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-07-13 20:06:34,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 20:06:34,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-07-13 20:06:34,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-07-13 20:06:34,946 INFO L87 Difference]: Start difference. First operand 3424 states and 13248 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:36,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 20:06:36,400 INFO L93 Difference]: Finished difference Result 3901 states and 14689 transitions. [2021-07-13 20:06:36,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-07-13 20:06:36,401 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-07-13 20:06:36,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 20:06:36,408 INFO L225 Difference]: With dead ends: 3901 [2021-07-13 20:06:36,409 INFO L226 Difference]: Without dead ends: 3890 [2021-07-13 20:06:36,409 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 1348.7ms TimeCoverageRelationStatistics Valid=408, Invalid=1944, Unknown=0, NotChecked=0, Total=2352 [2021-07-13 20:06:36,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3890 states. [2021-07-13 20:06:36,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3890 to 3430. [2021-07-13 20:06:36,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3430 states, 3429 states have (on average 3.8710994459025954) internal successors, (13274), 3429 states have internal predecessors, (13274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:36,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3430 states to 3430 states and 13274 transitions. [2021-07-13 20:06:36,462 INFO L78 Accepts]: Start accepts. Automaton has 3430 states and 13274 transitions. Word has length 24 [2021-07-13 20:06:36,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 20:06:36,462 INFO L482 AbstractCegarLoop]: Abstraction has 3430 states and 13274 transitions. [2021-07-13 20:06:36,462 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 24 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 20:06:36,462 INFO L276 IsEmpty]: Start isEmpty. Operand 3430 states and 13274 transitions. [2021-07-13 20:06:36,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-07-13 20:06:36,467 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 20:06:36,467 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] Received shutdown request... [2021-07-13 20:06:36,667 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 363 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable723 [2021-07-13 20:06:36,668 INFO L430 AbstractCegarLoop]: === Iteration 375 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4INUSE_VIOLATION]=== [2021-07-13 20:06:36,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 20:06:36,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1874582706, now seen corresponding path program 238 times [2021-07-13 20:06:36,668 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 20:06:36,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883247064] [2021-07-13 20:06:36,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 20:06:36,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2021-07-13 20:06:36,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1980526273] [2021-07-13 20:06:36,670 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 364 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 364 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:36,699 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 20:06:36,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 20:06:36,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2021-07-13 20:06:36,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 20:06:36,704 WARN L222 SmtUtils]: Removed 1 from assertion stack [2021-07-13 20:06:36,904 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable728,364 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 20:06:36,904 WARN L547 AbstractCegarLoop]: Verification canceled [2021-07-13 20:06:36,905 INFO L301 ceAbstractionStarter]: Result for error location ULTIMATE.start was TIMEOUT (2/2) [2021-07-13 20:06:36,905 INFO L247 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2021-07-13 20:06:36,918 WARN L196 ceAbstractionStarter]: Timeout [2021-07-13 20:06:36,918 INFO L202 PluginConnector]: Adding new model parallel-sum-equiv.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.07 08:06:36 BasicIcfg [2021-07-13 20:06:36,918 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-07-13 20:06:36,919 INFO L168 Benchmark]: Toolchain (without parser) took 807506.47 ms. Allocated memory was 224.4 MB in the beginning and 843.1 MB in the end (delta: 618.7 MB). Free memory was 203.9 MB in the beginning and 633.6 MB in the end (delta: -429.7 MB). Peak memory consumption was 189.5 MB. Max. memory is 8.0 GB. [2021-07-13 20:06:36,919 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.13 ms. Allocated memory is still 224.4 MB. Free memory is still 204.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-07-13 20:06:36,919 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.70 ms. Allocated memory is still 224.4 MB. Free memory was 203.8 MB in the beginning and 202.3 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-07-13 20:06:36,919 INFO L168 Benchmark]: Boogie Preprocessor took 12.14 ms. Allocated memory is still 224.4 MB. Free memory was 202.3 MB in the beginning and 201.3 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-07-13 20:06:36,919 INFO L168 Benchmark]: RCFGBuilder took 260.58 ms. Allocated memory is still 224.4 MB. Free memory was 201.3 MB in the beginning and 185.4 MB in the end (delta: 15.9 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-07-13 20:06:36,919 INFO L168 Benchmark]: TraceAbstraction took 807201.78 ms. Allocated memory was 224.4 MB in the beginning and 843.1 MB in the end (delta: 618.7 MB). Free memory was 185.0 MB in the beginning and 633.6 MB in the end (delta: -448.6 MB). Peak memory consumption was 170.6 MB. Max. memory is 8.0 GB. [2021-07-13 20:06:36,919 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.13 ms. Allocated memory is still 224.4 MB. Free memory is still 204.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 24.70 ms. Allocated memory is still 224.4 MB. Free memory was 203.8 MB in the beginning and 202.3 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 8.0 GB. * Boogie Preprocessor took 12.14 ms. Allocated memory is still 224.4 MB. Free memory was 202.3 MB in the beginning and 201.3 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 260.58 ms. Allocated memory is still 224.4 MB. Free memory was 201.3 MB in the beginning and 185.4 MB in the end (delta: 15.9 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 807201.78 ms. Allocated memory was 224.4 MB in the beginning and 843.1 MB in the end (delta: 618.7 MB). Free memory was 185.0 MB in the beginning and 633.6 MB in the end (delta: -448.6 MB). Peak memory consumption was 170.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 86]: Timeout (TraceAbstraction) Unable to prove that assertion always holds Cancelled while BasicCegarLoop was analyzing trace of length 25 with TraceHistMax 2,while TraceCheckSpWp was constructing forward predicates,while PredicateUnifier was unifying predicates,while SimplifyDDAWithTimeout was simplifying term of DAG size 6 for 0ms.. - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: thread1Thread1of1ForFork0 with 1 thread instances CFG has 9 procedures, 49 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 42.3ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 6.9ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 31.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=26occurred in iteration=0, InterpolantAutomatonStates: 0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: ULTIMATE.start with 1 thread instances CFG has 9 procedures, 49 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: TIMEOUT, OverallTime: 806990.8ms, OverallIterations: 375, TraceHistogramMax: 2, EmptinessCheckTime: 1198.2ms, AutomataDifference: 556196.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 23.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 25217 SDtfs, 71413 SDslu, 219088 SDs, 0 SdLazy, 320325 SolverSat, 39670 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 154664.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 21662 GetRequests, 5459 SyntacticMatches, 407 SemanticMatches, 15796 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238486 ImplicationChecksByTransitivity, 467767.1ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=3430occurred in iteration=374, InterpolantAutomatonStates: 13751, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 12415.7ms AutomataMinimizationTime, 374 MinimizatonAttempts, 223322 StatesRemovedByMinimization, 373 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 1704.3ms SsaConstructionTime, 4045.6ms SatisfiabilityAnalysisTime, 147768.4ms InterpolantComputationTime, 17132 NumberOfCodeBlocks, 17132 NumberOfCodeBlocksAsserted, 1125 NumberOfCheckSat, 16396 ConstructedInterpolants, 398 QuantifiedInterpolants, 232339 SizeOfPredicates, 2882 NumberOfNonLiveVariables, 29610 ConjunctsInSsa, 10718 ConjunctsInUnsatCore, 736 InterpolantComputations, 12 PerfectInterpolantSequences, 164/4182 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown