/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/test/context1.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-9bbddad6b14272d9691b7fb6f1c011d15ab18596-9bbddad [2021-06-12 22:32:33,446 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-12 22:32:33,448 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-12 22:32:33,470 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-06-12 22:32:33,523 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 [2021-06-12 22:32:33,543 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-12 22:32:33,543 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-12 22:32:33,543 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-06-12 22:32:33,543 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-06-12 22:32:33,544 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-12 22:32:33,544 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-12 22:32:33,544 INFO L138 SettingsManager]: * Use SBE=true [2021-06-12 22:32:33,545 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-12 22:32:33,545 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-12 22:32:33,545 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-12 22:32:33,545 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-12 22:32:33,545 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-12 22:32:33,545 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-12 22:32:33,546 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-12 22:32:33,546 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-12 22:32:33,546 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-12 22:32:33,546 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-12 22:32:33,546 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-12 22:32:33,546 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-12 22:32:33,546 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-12 22:32:33,547 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-12 22:32:33,547 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-12 22:32:33,547 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-12 22:32:33,547 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-12 22:32:33,547 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-12 22:32:33,547 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-12 22:32:33,547 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-12 22:32:33,547 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-12 22:32:33,548 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-12 22:32:33,548 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-12 22:32:33,548 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-06-12 22:32:33,548 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-12 22:32:33,818 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-12 22:32:33,838 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-12 22:32:33,840 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-12 22:32:33,841 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-12 22:32:33,849 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-12 22:32:33,849 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/context1.wvr.bpl [2021-06-12 22:32:33,856 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/context1.wvr.bpl' [2021-06-12 22:32:33,882 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-12 22:32:33,884 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-12 22:32:33,884 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-12 22:32:33,884 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-12 22:32:33,884 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-12 22:32:33,893 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,898 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,904 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-12 22:32:33,905 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-12 22:32:33,905 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-12 22:32:33,906 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-12 22:32:33,912 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,912 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,913 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,913 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,915 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,916 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,917 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/1) ... [2021-06-12 22:32:33,918 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-12 22:32:33,918 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-12 22:32:33,918 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-12 22:32:33,918 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-12 22:32:33,922 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (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 [2021-06-12 22:32:33,995 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-06-12 22:32:33,995 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-06-12 22:32:33,995 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-06-12 22:32:33,995 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-06-12 22:32:33,995 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-06-12 22:32:33,995 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-06-12 22:32:33,996 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-06-12 22:32:33,996 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-12 22:32:33,996 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-12 22:32:33,996 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-06-12 22:32:34,136 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-12 22:32:34,137 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-06-12 22:32:34,138 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread1EXIT is neither atomic block end nor error location. [2021-06-12 22:32:34,138 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread2EXIT is neither atomic block end nor error location. [2021-06-12 22:32:34,139 INFO L202 PluginConnector]: Adding new model context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 10:32:34 BoogieIcfgContainer [2021-06-12 22:32:34,139 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-12 22:32:34,141 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-12 22:32:34,141 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-12 22:32:34,143 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-12 22:32:34,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 10:32:33" (1/2) ... [2021-06-12 22:32:34,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@327759ac and model type context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.06 10:32:34, skipping insertion in model container [2021-06-12 22:32:34,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 10:32:34" (2/2) ... [2021-06-12 22:32:34,145 INFO L111 eAbstractionObserver]: Analyzing ICFG context1.wvr.bpl [2021-06-12 22:32:34,150 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-06-12 22:32:34,150 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-12 22:32:34,150 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-06-12 22:32:34,151 INFO L471 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-12 22:32:34,174 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-06-12 22:32:34,191 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-06-12 22:32:34,208 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-12 22:32:34,208 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-12 22:32:34,208 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-12 22:32:34,208 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-12 22:32:34,208 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-12 22:32:34,208 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-12 22:32:34,209 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-12 22:32:34,209 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-06-12 22:32:34,216 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 20 places, 15 transitions, 46 flow [2021-06-12 22:32:34,223 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:34,225 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:34,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-06-12 22:32:34,229 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:32:34,230 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:32:34,230 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:32:34,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:32:34,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1225879624, now seen corresponding path program 1 times [2021-06-12 22:32:34,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:32:34,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317682676] [2021-06-12 22:32:34,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:32:34,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:32:34,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:34,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:32:34,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317682676] [2021-06-12 22:32:34,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317682676] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 22:32:34,404 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 22:32:34,404 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-06-12 22:32:34,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790905281] [2021-06-12 22:32:34,407 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 22:32:34,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:32:34,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 22:32:34,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 22:32:34,427 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 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 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:34,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:32:34,455 INFO L93 Difference]: Finished difference Result 20 states and 34 transitions. [2021-06-12 22:32:34,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 22:32:34,456 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-06-12 22:32:34,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:32:34,467 INFO L225 Difference]: With dead ends: 20 [2021-06-12 22:32:34,467 INFO L226 Difference]: Without dead ends: 16 [2021-06-12 22:32:34,469 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 22:32:34,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-06-12 22:32:34,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-06-12 22:32:34,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 15 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) [2021-06-12 22:32:34,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 27 transitions. [2021-06-12 22:32:34,503 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 27 transitions. Word has length 9 [2021-06-12 22:32:34,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:32:34,503 INFO L482 AbstractCegarLoop]: Abstraction has 16 states and 27 transitions. [2021-06-12 22:32:34,504 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:34,504 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 27 transitions. [2021-06-12 22:32:34,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-06-12 22:32:34,504 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:32:34,505 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:32:34,505 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-06-12 22:32:34,506 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:32:34,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:32:34,510 INFO L82 PathProgramCache]: Analyzing trace with hash 653163243, now seen corresponding path program 1 times [2021-06-12 22:32:34,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:32:34,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304506389] [2021-06-12 22:32:34,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:32:34,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:32:34,567 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:34,567 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:32:34,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304506389] [2021-06-12 22:32:34,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304506389] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 22:32:34,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 22:32:34,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-06-12 22:32:34,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918922054] [2021-06-12 22:32:34,570 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 22:32:34,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:32:34,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 22:32:34,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 22:32:34,572 INFO L87 Difference]: Start difference. First operand 16 states and 27 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:34,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:32:34,594 INFO L93 Difference]: Finished difference Result 21 states and 34 transitions. [2021-06-12 22:32:34,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 22:32:34,594 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-06-12 22:32:34,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:32:34,595 INFO L225 Difference]: With dead ends: 21 [2021-06-12 22:32:34,595 INFO L226 Difference]: Without dead ends: 18 [2021-06-12 22:32:34,595 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 22:32:34,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-06-12 22:32:34,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-06-12 22:32:34,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 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) [2021-06-12 22:32:34,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 30 transitions. [2021-06-12 22:32:34,599 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 30 transitions. Word has length 10 [2021-06-12 22:32:34,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:32:34,599 INFO L482 AbstractCegarLoop]: Abstraction has 18 states and 30 transitions. [2021-06-12 22:32:34,599 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:34,599 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 30 transitions. [2021-06-12 22:32:34,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-06-12 22:32:34,600 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:32:34,600 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:32:34,600 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-06-12 22:32:34,600 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:32:34,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:32:34,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1382019562, now seen corresponding path program 1 times [2021-06-12 22:32:34,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:32:34,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093965331] [2021-06-12 22:32:34,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:32:34,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:32:34,672 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:34,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:32:34,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093965331] [2021-06-12 22:32:34,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093965331] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:34,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739776260] [2021-06-12 22:32:34,673 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 [2021-06-12 22:32:34,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:32:34,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 7 conjunts are in the unsatisfiable core [2021-06-12 22:32:34,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:32:34,831 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 11 treesize of output 7 [2021-06-12 22:32:34,836 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:32:34,838 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:32:34,839 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:32:34,840 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:32:34,851 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:34,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739776260] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:34,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:32:34,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-06-12 22:32:34,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943712152] [2021-06-12 22:32:34,856 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-12 22:32:34,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:32:34,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-12 22:32:34,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-06-12 22:32:34,863 INFO L87 Difference]: Start difference. First operand 18 states and 30 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:34,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:32:34,903 INFO L93 Difference]: Finished difference Result 25 states and 43 transitions. [2021-06-12 22:32:34,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-06-12 22:32:34,903 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-06-12 22:32:34,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:32:34,906 INFO L225 Difference]: With dead ends: 25 [2021-06-12 22:32:34,906 INFO L226 Difference]: Without dead ends: 21 [2021-06-12 22:32:34,906 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 30.5ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-06-12 22:32:34,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-06-12 22:32:34,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-06-12 22:32:34,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.8) internal successors, (36), 20 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) [2021-06-12 22:32:34,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 36 transitions. [2021-06-12 22:32:34,913 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 36 transitions. Word has length 11 [2021-06-12 22:32:34,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:32:34,914 INFO L482 AbstractCegarLoop]: Abstraction has 21 states and 36 transitions. [2021-06-12 22:32:34,914 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:34,914 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 36 transitions. [2021-06-12 22:32:34,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-12 22:32:34,914 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:32:34,914 INFO L472 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:32:35,129 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-06-12 22:32:35,129 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:32:35,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:32:35,130 INFO L82 PathProgramCache]: Analyzing trace with hash 107792461, now seen corresponding path program 2 times [2021-06-12 22:32:35,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:32:35,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924469362] [2021-06-12 22:32:35,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:32:35,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:32:35,157 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:35,157 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:32:35,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924469362] [2021-06-12 22:32:35,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924469362] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:35,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451252151] [2021-06-12 22:32:35,158 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 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 [2021-06-12 22:32:35,213 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-12 22:32:35,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:32:35,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2021-06-12 22:32:35,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:32:35,300 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:35,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [451252151] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:35,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:32:35,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-06-12 22:32:35,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306316254] [2021-06-12 22:32:35,301 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-12 22:32:35,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:32:35,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-12 22:32:35,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-12 22:32:35,302 INFO L87 Difference]: Start difference. First operand 21 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:35,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:32:35,311 INFO L93 Difference]: Finished difference Result 50 states and 82 transitions. [2021-06-12 22:32:35,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-12 22:32:35,311 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-06-12 22:32:35,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:32:35,313 INFO L225 Difference]: With dead ends: 50 [2021-06-12 22:32:35,313 INFO L226 Difference]: Without dead ends: 45 [2021-06-12 22:32:35,313 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-12 22:32:35,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-06-12 22:32:35,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2021-06-12 22:32:35,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.9375) internal successors, (62), 32 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:35,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 62 transitions. [2021-06-12 22:32:35,319 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 62 transitions. Word has length 12 [2021-06-12 22:32:35,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:32:35,319 INFO L482 AbstractCegarLoop]: Abstraction has 33 states and 62 transitions. [2021-06-12 22:32:35,319 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:35,319 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 62 transitions. [2021-06-12 22:32:35,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-12 22:32:35,320 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:32:35,320 INFO L472 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:32:35,524 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:32:35,525 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:32:35,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:32:35,526 INFO L82 PathProgramCache]: Analyzing trace with hash -1492763464, now seen corresponding path program 3 times [2021-06-12 22:32:35,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:32:35,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397329787] [2021-06-12 22:32:35,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:32:35,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:32:35,592 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:35,592 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:32:35,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397329787] [2021-06-12 22:32:35,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397329787] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:35,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181496178] [2021-06-12 22:32:35,593 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 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 [2021-06-12 22:32:35,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-06-12 22:32:35,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:32:35,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2021-06-12 22:32:35,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:32:35,692 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 11 treesize of output 7 [2021-06-12 22:32:35,694 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:32:35,695 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:32:35,696 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:32:35,696 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:32:35,702 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:35,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181496178] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:35,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:32:35,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-06-12 22:32:35,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294985116] [2021-06-12 22:32:35,703 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-12 22:32:35,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:32:35,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-12 22:32:35,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-06-12 22:32:35,704 INFO L87 Difference]: Start difference. First operand 33 states and 62 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:35,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:32:35,767 INFO L93 Difference]: Finished difference Result 65 states and 115 transitions. [2021-06-12 22:32:35,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-12 22:32:35,768 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-06-12 22:32:35,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:32:35,768 INFO L225 Difference]: With dead ends: 65 [2021-06-12 22:32:35,769 INFO L226 Difference]: Without dead ends: 39 [2021-06-12 22:32:35,769 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 76.9ms TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-06-12 22:32:35,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-06-12 22:32:35,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 26. [2021-06-12 22:32:35,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.84) internal successors, (46), 25 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:35,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 46 transitions. [2021-06-12 22:32:35,773 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 46 transitions. Word has length 13 [2021-06-12 22:32:35,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:32:35,773 INFO L482 AbstractCegarLoop]: Abstraction has 26 states and 46 transitions. [2021-06-12 22:32:35,773 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:35,773 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 46 transitions. [2021-06-12 22:32:35,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-06-12 22:32:35,774 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:32:35,774 INFO L472 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:32:35,988 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:32:35,989 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:32:35,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:32:35,989 INFO L82 PathProgramCache]: Analyzing trace with hash 969698795, now seen corresponding path program 4 times [2021-06-12 22:32:35,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:32:35,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053208766] [2021-06-12 22:32:35,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:32:35,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:32:36,028 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:36,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:32:36,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053208766] [2021-06-12 22:32:36,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053208766] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:36,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590510440] [2021-06-12 22:32:36,030 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 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 [2021-06-12 22:32:36,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-12 22:32:36,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:32:36,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-06-12 22:32:36,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:32:36,119 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:36,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590510440] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:36,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:32:36,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-06-12 22:32:36,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133059009] [2021-06-12 22:32:36,120 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-12 22:32:36,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:32:36,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-12 22:32:36,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-06-12 22:32:36,121 INFO L87 Difference]: Start difference. First operand 26 states and 46 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:36,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:32:36,132 INFO L93 Difference]: Finished difference Result 73 states and 125 transitions. [2021-06-12 22:32:36,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-06-12 22:32:36,133 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-06-12 22:32:36,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:32:36,133 INFO L225 Difference]: With dead ends: 73 [2021-06-12 22:32:36,133 INFO L226 Difference]: Without dead ends: 66 [2021-06-12 22:32:36,134 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.1ms TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-06-12 22:32:36,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-06-12 22:32:36,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 48. [2021-06-12 22:32:36,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 2.021276595744681) internal successors, (95), 47 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:36,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 95 transitions. [2021-06-12 22:32:36,142 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 95 transitions. Word has length 14 [2021-06-12 22:32:36,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:32:36,143 INFO L482 AbstractCegarLoop]: Abstraction has 48 states and 95 transitions. [2021-06-12 22:32:36,143 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:32:36,143 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 95 transitions. [2021-06-12 22:32:36,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-12 22:32:36,143 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:32:36,143 INFO L472 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:32:36,344 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:32:36,344 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:32:36,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:32:36,344 INFO L82 PathProgramCache]: Analyzing trace with hash 433746838, now seen corresponding path program 5 times [2021-06-12 22:32:36,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:32:36,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778671423] [2021-06-12 22:32:36,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:32:36,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:32:36,442 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:36,442 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:32:36,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778671423] [2021-06-12 22:32:36,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778671423] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:36,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265651223] [2021-06-12 22:32:36,443 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 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 [2021-06-12 22:32:36,466 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-06-12 22:32:36,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:32:36,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 16 conjunts are in the unsatisfiable core [2021-06-12 22:32:36,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:32:42,810 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-06-12 22:32:42,810 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 14 treesize of output 10 [2021-06-12 22:32:42,812 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:32:42,818 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:32:42,821 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:32:42,821 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:20, output treesize:3 [2021-06-12 22:32:42,828 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:32:42,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265651223] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:32:42,828 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:32:42,828 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-06-12 22:32:42,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024735423] [2021-06-12 22:32:42,829 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-06-12 22:32:42,829 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:32:42,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-06-12 22:32:42,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=168, Unknown=3, NotChecked=0, Total=210 [2021-06-12 22:32:42,832 INFO L87 Difference]: Start difference. First operand 48 states and 95 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 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) [2021-06-12 22:32:47,318 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 33 [2021-06-12 22:32:49,374 WARN L205 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 25 [2021-06-12 22:32:55,511 WARN L205 SmtUtils]: Spent 4.06 s on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2021-06-12 22:33:01,658 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 23 [2021-06-12 22:33:01,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:01,696 INFO L93 Difference]: Finished difference Result 229 states and 428 transitions. [2021-06-12 22:33:01,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-06-12 22:33:01,697 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 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 15 [2021-06-12 22:33:01,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:01,698 INFO L225 Difference]: With dead ends: 229 [2021-06-12 22:33:01,698 INFO L226 Difference]: Without dead ends: 116 [2021-06-12 22:33:01,698 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 24851.1ms TimeCoverageRelationStatistics Valid=229, Invalid=821, Unknown=6, NotChecked=0, Total=1056 [2021-06-12 22:33:01,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-06-12 22:33:01,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 56. [2021-06-12 22:33:01,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 2.0545454545454547) internal successors, (113), 55 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:01,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 113 transitions. [2021-06-12 22:33:01,708 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 113 transitions. Word has length 15 [2021-06-12 22:33:01,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:01,709 INFO L482 AbstractCegarLoop]: Abstraction has 56 states and 113 transitions. [2021-06-12 22:33:01,709 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 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) [2021-06-12 22:33:01,709 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 113 transitions. [2021-06-12 22:33:01,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-12 22:33:01,710 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:01,710 INFO L472 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:01,924 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-06-12 22:33:01,925 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:01,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:01,925 INFO L82 PathProgramCache]: Analyzing trace with hash 908220856, now seen corresponding path program 6 times [2021-06-12 22:33:01,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:01,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108874037] [2021-06-12 22:33:01,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:01,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:02,024 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:02,024 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:02,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108874037] [2021-06-12 22:33:02,024 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108874037] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:02,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12518433] [2021-06-12 22:33:02,024 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 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 [2021-06-12 22:33:02,052 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-06-12 22:33:02,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:02,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2021-06-12 22:33:02,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:02,110 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 11 treesize of output 7 [2021-06-12 22:33:02,111 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:33:02,112 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:33:02,112 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:33:02,112 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:33:02,118 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:02,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12518433] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:02,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:02,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2021-06-12 22:33:02,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832739663] [2021-06-12 22:33:02,118 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-06-12 22:33:02,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:02,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-06-12 22:33:02,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-06-12 22:33:02,119 INFO L87 Difference]: Start difference. First operand 56 states and 113 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:02,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:02,289 INFO L93 Difference]: Finished difference Result 121 states and 226 transitions. [2021-06-12 22:33:02,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-06-12 22:33:02,290 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-06-12 22:33:02,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:02,291 INFO L225 Difference]: With dead ends: 121 [2021-06-12 22:33:02,291 INFO L226 Difference]: Without dead ends: 77 [2021-06-12 22:33:02,291 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 182.5ms TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-06-12 22:33:02,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-06-12 22:33:02,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 36. [2021-06-12 22:33:02,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 35 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:02,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 66 transitions. [2021-06-12 22:33:02,295 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 66 transitions. Word has length 17 [2021-06-12 22:33:02,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:02,295 INFO L482 AbstractCegarLoop]: Abstraction has 36 states and 66 transitions. [2021-06-12 22:33:02,295 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:02,296 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 66 transitions. [2021-06-12 22:33:02,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-06-12 22:33:02,296 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:02,296 INFO L472 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:02,496 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:33:02,497 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:02,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:02,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1909198613, now seen corresponding path program 7 times [2021-06-12 22:33:02,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:02,498 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615395176] [2021-06-12 22:33:02,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:02,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:02,539 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:02,540 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:02,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615395176] [2021-06-12 22:33:02,540 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615395176] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:02,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473457998] [2021-06-12 22:33:02,540 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 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 [2021-06-12 22:33:02,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:02,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2021-06-12 22:33:02,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:02,626 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:02,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473457998] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:02,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:02,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-06-12 22:33:02,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572900431] [2021-06-12 22:33:02,629 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-12 22:33:02,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:02,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-12 22:33:02,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-06-12 22:33:02,630 INFO L87 Difference]: Start difference. First operand 36 states and 66 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 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) [2021-06-12 22:33:02,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:02,645 INFO L93 Difference]: Finished difference Result 128 states and 229 transitions. [2021-06-12 22:33:02,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-12 22:33:02,646 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 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 [2021-06-12 22:33:02,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:02,647 INFO L225 Difference]: With dead ends: 128 [2021-06-12 22:33:02,647 INFO L226 Difference]: Without dead ends: 117 [2021-06-12 22:33:02,647 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.5ms TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-06-12 22:33:02,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-06-12 22:33:02,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 87. [2021-06-12 22:33:02,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 2.0813953488372094) internal successors, (179), 86 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:02,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 179 transitions. [2021-06-12 22:33:02,660 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 179 transitions. Word has length 18 [2021-06-12 22:33:02,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:02,660 INFO L482 AbstractCegarLoop]: Abstraction has 87 states and 179 transitions. [2021-06-12 22:33:02,660 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 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) [2021-06-12 22:33:02,660 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 179 transitions. [2021-06-12 22:33:02,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-06-12 22:33:02,661 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:02,661 INFO L472 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:02,882 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:33:02,883 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:02,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:02,883 INFO L82 PathProgramCache]: Analyzing trace with hash 119613718, now seen corresponding path program 8 times [2021-06-12 22:33:02,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:02,883 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113569902] [2021-06-12 22:33:02,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:02,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:03,031 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:03,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:03,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113569902] [2021-06-12 22:33:03,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113569902] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:03,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169597987] [2021-06-12 22:33:03,032 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 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 [2021-06-12 22:33:03,059 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-12 22:33:03,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:03,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 23 conjunts are in the unsatisfiable core [2021-06-12 22:33:03,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:03,132 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 11 treesize of output 7 [2021-06-12 22:33:03,134 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:33:03,135 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:33:03,136 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:33:03,136 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:33:03,142 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:03,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169597987] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:03,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:03,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2021-06-12 22:33:03,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964418650] [2021-06-12 22:33:03,147 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-12 22:33:03,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:03,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-12 22:33:03,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-06-12 22:33:03,148 INFO L87 Difference]: Start difference. First operand 87 states and 179 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:03,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:03,389 INFO L93 Difference]: Finished difference Result 179 states and 337 transitions. [2021-06-12 22:33:03,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-06-12 22:33:03,390 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-06-12 22:33:03,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:03,390 INFO L225 Difference]: With dead ends: 179 [2021-06-12 22:33:03,390 INFO L226 Difference]: Without dead ends: 105 [2021-06-12 22:33:03,391 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 272.0ms TimeCoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2021-06-12 22:33:03,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-06-12 22:33:03,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 41. [2021-06-12 22:33:03,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.9) internal successors, (76), 40 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:03,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 76 transitions. [2021-06-12 22:33:03,401 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 76 transitions. Word has length 19 [2021-06-12 22:33:03,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:03,401 INFO L482 AbstractCegarLoop]: Abstraction has 41 states and 76 transitions. [2021-06-12 22:33:03,401 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:03,401 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 76 transitions. [2021-06-12 22:33:03,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-12 22:33:03,404 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:03,404 INFO L472 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:03,628 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-06-12 22:33:03,628 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:03,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:03,629 INFO L82 PathProgramCache]: Analyzing trace with hash -586216115, now seen corresponding path program 9 times [2021-06-12 22:33:03,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:03,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089740674] [2021-06-12 22:33:03,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:03,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:03,680 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:03,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:03,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089740674] [2021-06-12 22:33:03,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089740674] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:03,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539601394] [2021-06-12 22:33:03,681 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 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 [2021-06-12 22:33:03,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-06-12 22:33:03,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:03,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-12 22:33:03,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:03,773 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:03,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539601394] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:03,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:03,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-06-12 22:33:03,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216557346] [2021-06-12 22:33:03,774 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-06-12 22:33:03,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:03,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-06-12 22:33:03,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-06-12 22:33:03,775 INFO L87 Difference]: Start difference. First operand 41 states and 76 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 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) [2021-06-12 22:33:03,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:03,792 INFO L93 Difference]: Finished difference Result 160 states and 290 transitions. [2021-06-12 22:33:03,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-06-12 22:33:03,793 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 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 20 [2021-06-12 22:33:03,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:03,794 INFO L225 Difference]: With dead ends: 160 [2021-06-12 22:33:03,794 INFO L226 Difference]: Without dead ends: 147 [2021-06-12 22:33:03,794 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.9ms TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-06-12 22:33:03,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-06-12 22:33:03,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 111. [2021-06-12 22:33:03,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 2.090909090909091) internal successors, (230), 110 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:03,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 230 transitions. [2021-06-12 22:33:03,799 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 230 transitions. Word has length 20 [2021-06-12 22:33:03,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:03,799 INFO L482 AbstractCegarLoop]: Abstraction has 111 states and 230 transitions. [2021-06-12 22:33:03,799 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 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) [2021-06-12 22:33:03,800 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 230 transitions. [2021-06-12 22:33:03,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-06-12 22:33:03,800 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:03,800 INFO L472 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:04,023 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:33:04,023 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:04,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:04,024 INFO L82 PathProgramCache]: Analyzing trace with hash -812718408, now seen corresponding path program 10 times [2021-06-12 22:33:04,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:04,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691218944] [2021-06-12 22:33:04,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:04,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:04,199 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:04,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:04,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691218944] [2021-06-12 22:33:04,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691218944] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:04,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733234703] [2021-06-12 22:33:04,200 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 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 [2021-06-12 22:33:04,237 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-12 22:33:04,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:04,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 27 conjunts are in the unsatisfiable core [2021-06-12 22:33:04,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:04,299 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 11 treesize of output 7 [2021-06-12 22:33:04,300 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:33:04,301 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:33:04,302 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:33:04,302 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:33:04,308 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:04,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733234703] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:04,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:04,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2021-06-12 22:33:04,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107132140] [2021-06-12 22:33:04,309 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-06-12 22:33:04,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:04,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-06-12 22:33:04,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-06-12 22:33:04,310 INFO L87 Difference]: Start difference. First operand 111 states and 230 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:04,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:04,621 INFO L93 Difference]: Finished difference Result 229 states and 435 transitions. [2021-06-12 22:33:04,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-06-12 22:33:04,621 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-06-12 22:33:04,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:04,622 INFO L225 Difference]: With dead ends: 229 [2021-06-12 22:33:04,622 INFO L226 Difference]: Without dead ends: 135 [2021-06-12 22:33:04,622 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 356.6ms TimeCoverageRelationStatistics Valid=135, Invalid=567, Unknown=0, NotChecked=0, Total=702 [2021-06-12 22:33:04,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-06-12 22:33:04,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 46. [2021-06-12 22:33:04,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.9111111111111112) internal successors, (86), 45 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:04,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 86 transitions. [2021-06-12 22:33:04,625 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 86 transitions. Word has length 21 [2021-06-12 22:33:04,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:04,626 INFO L482 AbstractCegarLoop]: Abstraction has 46 states and 86 transitions. [2021-06-12 22:33:04,626 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:04,626 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 86 transitions. [2021-06-12 22:33:04,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-12 22:33:04,626 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:04,626 INFO L472 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:04,840 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:33:04,841 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:04,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:04,841 INFO L82 PathProgramCache]: Analyzing trace with hash 576259051, now seen corresponding path program 11 times [2021-06-12 22:33:04,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:04,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100599388] [2021-06-12 22:33:04,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:04,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:04,894 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:04,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:04,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100599388] [2021-06-12 22:33:04,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100599388] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:04,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443554467] [2021-06-12 22:33:04,895 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 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 [2021-06-12 22:33:04,936 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-06-12 22:33:04,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:04,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 14 conjunts are in the unsatisfiable core [2021-06-12 22:33:04,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:04,990 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:04,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443554467] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:04,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:04,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-06-12 22:33:04,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864644001] [2021-06-12 22:33:04,991 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-06-12 22:33:04,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:04,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-06-12 22:33:04,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-06-12 22:33:04,991 INFO L87 Difference]: Start difference. First operand 46 states and 86 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:05,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:05,010 INFO L93 Difference]: Finished difference Result 195 states and 357 transitions. [2021-06-12 22:33:05,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-06-12 22:33:05,013 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have 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 [2021-06-12 22:33:05,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:05,014 INFO L225 Difference]: With dead ends: 195 [2021-06-12 22:33:05,014 INFO L226 Difference]: Without dead ends: 180 [2021-06-12 22:33:05,014 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.0ms TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-06-12 22:33:05,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-06-12 22:33:05,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 138. [2021-06-12 22:33:05,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 2.0948905109489053) internal successors, (287), 137 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:05,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 287 transitions. [2021-06-12 22:33:05,027 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 287 transitions. Word has length 22 [2021-06-12 22:33:05,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:05,028 INFO L482 AbstractCegarLoop]: Abstraction has 138 states and 287 transitions. [2021-06-12 22:33:05,028 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:05,028 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 287 transitions. [2021-06-12 22:33:05,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-06-12 22:33:05,032 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:05,032 INFO L472 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:05,248 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-06-12 22:33:05,249 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:05,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:05,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1950887574, now seen corresponding path program 12 times [2021-06-12 22:33:05,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:05,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888805708] [2021-06-12 22:33:05,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:05,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:05,455 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:05,455 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:05,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888805708] [2021-06-12 22:33:05,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888805708] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:05,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940284695] [2021-06-12 22:33:05,455 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 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 [2021-06-12 22:33:05,490 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-06-12 22:33:05,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:05,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 31 conjunts are in the unsatisfiable core [2021-06-12 22:33:05,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:05,559 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 11 treesize of output 7 [2021-06-12 22:33:05,561 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:33:05,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:33:05,563 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:33:05,563 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:33:05,570 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:05,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940284695] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:05,570 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:05,570 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2021-06-12 22:33:05,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513288123] [2021-06-12 22:33:05,571 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-06-12 22:33:05,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:05,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-06-12 22:33:05,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2021-06-12 22:33:05,572 INFO L87 Difference]: Start difference. First operand 138 states and 287 transitions. Second operand has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:05,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:05,954 INFO L93 Difference]: Finished difference Result 285 states and 545 transitions. [2021-06-12 22:33:05,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-06-12 22:33:05,955 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-06-12 22:33:05,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:05,955 INFO L225 Difference]: With dead ends: 285 [2021-06-12 22:33:05,956 INFO L226 Difference]: Without dead ends: 169 [2021-06-12 22:33:05,956 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 435.9ms TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2021-06-12 22:33:05,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-06-12 22:33:05,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 51. [2021-06-12 22:33:05,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.92) internal successors, (96), 50 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:05,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 96 transitions. [2021-06-12 22:33:05,959 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 96 transitions. Word has length 23 [2021-06-12 22:33:05,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:05,959 INFO L482 AbstractCegarLoop]: Abstraction has 51 states and 96 transitions. [2021-06-12 22:33:05,959 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:05,959 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 96 transitions. [2021-06-12 22:33:05,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-06-12 22:33:05,960 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:05,960 INFO L472 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:06,172 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-06-12 22:33:06,173 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:06,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:06,173 INFO L82 PathProgramCache]: Analyzing trace with hash 348698573, now seen corresponding path program 13 times [2021-06-12 22:33:06,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:06,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680882240] [2021-06-12 22:33:06,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:06,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:06,233 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:06,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:06,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680882240] [2021-06-12 22:33:06,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680882240] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:06,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680774091] [2021-06-12 22:33:06,234 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 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 [2021-06-12 22:33:06,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:06,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 16 conjunts are in the unsatisfiable core [2021-06-12 22:33:06,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:06,321 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:06,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680774091] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:06,321 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:06,321 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2021-06-12 22:33:06,322 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383599879] [2021-06-12 22:33:06,322 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-06-12 22:33:06,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:06,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-06-12 22:33:06,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-06-12 22:33:06,322 INFO L87 Difference]: Start difference. First operand 51 states and 96 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:06,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:06,346 INFO L93 Difference]: Finished difference Result 233 states and 430 transitions. [2021-06-12 22:33:06,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-06-12 22:33:06,346 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-06-12 22:33:06,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:06,347 INFO L225 Difference]: With dead ends: 233 [2021-06-12 22:33:06,347 INFO L226 Difference]: Without dead ends: 216 [2021-06-12 22:33:06,347 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.0ms TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-06-12 22:33:06,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-06-12 22:33:06,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 168. [2021-06-12 22:33:06,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 2.095808383233533) internal successors, (350), 167 states have internal predecessors, (350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:06,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 350 transitions. [2021-06-12 22:33:06,352 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 350 transitions. Word has length 24 [2021-06-12 22:33:06,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:06,352 INFO L482 AbstractCegarLoop]: Abstraction has 168 states and 350 transitions. [2021-06-12 22:33:06,352 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:06,352 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 350 transitions. [2021-06-12 22:33:06,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-06-12 22:33:06,352 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:06,352 INFO L472 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:06,575 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-06-12 22:33:06,575 INFO L430 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:06,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:06,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1483217992, now seen corresponding path program 14 times [2021-06-12 22:33:06,576 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:06,576 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077009135] [2021-06-12 22:33:06,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:06,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:06,796 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:06,796 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:06,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077009135] [2021-06-12 22:33:06,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077009135] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:06,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727767543] [2021-06-12 22:33:06,797 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 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 [2021-06-12 22:33:06,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-12 22:33:06,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:06,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 35 conjunts are in the unsatisfiable core [2021-06-12 22:33:06,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:06,935 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 11 treesize of output 7 [2021-06-12 22:33:06,937 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:33:06,938 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:33:06,939 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:33:06,939 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:33:06,944 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:06,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727767543] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:06,944 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:06,944 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2021-06-12 22:33:06,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215817119] [2021-06-12 22:33:06,945 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-06-12 22:33:06,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:06,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-06-12 22:33:06,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2021-06-12 22:33:06,946 INFO L87 Difference]: Start difference. First operand 168 states and 350 transitions. Second operand has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:07,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:07,400 INFO L93 Difference]: Finished difference Result 347 states and 667 transitions. [2021-06-12 22:33:07,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-06-12 22:33:07,400 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-06-12 22:33:07,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:07,401 INFO L225 Difference]: With dead ends: 347 [2021-06-12 22:33:07,401 INFO L226 Difference]: Without dead ends: 207 [2021-06-12 22:33:07,402 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 504.0ms TimeCoverageRelationStatistics Valid=211, Invalid=979, Unknown=0, NotChecked=0, Total=1190 [2021-06-12 22:33:07,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-06-12 22:33:07,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 56. [2021-06-12 22:33:07,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.9272727272727272) internal successors, (106), 55 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:07,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 106 transitions. [2021-06-12 22:33:07,405 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 106 transitions. Word has length 25 [2021-06-12 22:33:07,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:07,405 INFO L482 AbstractCegarLoop]: Abstraction has 56 states and 106 transitions. [2021-06-12 22:33:07,405 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:07,405 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 106 transitions. [2021-06-12 22:33:07,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-06-12 22:33:07,405 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:07,405 INFO L472 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:07,620 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:33:07,621 INFO L430 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:07,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:07,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1265608427, now seen corresponding path program 15 times [2021-06-12 22:33:07,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:07,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408321626] [2021-06-12 22:33:07,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:07,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:07,696 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:07,697 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:07,697 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408321626] [2021-06-12 22:33:07,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408321626] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:07,697 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587414940] [2021-06-12 22:33:07,697 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 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 [2021-06-12 22:33:07,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-06-12 22:33:07,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:07,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 18 conjunts are in the unsatisfiable core [2021-06-12 22:33:07,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:07,831 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:07,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1587414940] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:07,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:07,831 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2021-06-12 22:33:07,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102423145] [2021-06-12 22:33:07,831 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-06-12 22:33:07,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:07,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-06-12 22:33:07,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-06-12 22:33:07,832 INFO L87 Difference]: Start difference. First operand 56 states and 106 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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) [2021-06-12 22:33:07,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:07,858 INFO L93 Difference]: Finished difference Result 274 states and 509 transitions. [2021-06-12 22:33:07,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-06-12 22:33:07,858 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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 26 [2021-06-12 22:33:07,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:07,859 INFO L225 Difference]: With dead ends: 274 [2021-06-12 22:33:07,859 INFO L226 Difference]: Without dead ends: 255 [2021-06-12 22:33:07,860 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.3ms TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-06-12 22:33:07,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-06-12 22:33:07,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 201. [2021-06-12 22:33:07,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 2.095) internal successors, (419), 200 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:07,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 419 transitions. [2021-06-12 22:33:07,865 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 419 transitions. Word has length 26 [2021-06-12 22:33:07,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:07,865 INFO L482 AbstractCegarLoop]: Abstraction has 201 states and 419 transitions. [2021-06-12 22:33:07,865 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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) [2021-06-12 22:33:07,865 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 419 transitions. [2021-06-12 22:33:07,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-06-12 22:33:07,866 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:07,866 INFO L472 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:08,088 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-06-12 22:33:08,089 INFO L430 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:08,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:08,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1730380822, now seen corresponding path program 16 times [2021-06-12 22:33:08,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:08,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805385804] [2021-06-12 22:33:08,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:08,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:08,343 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:08,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:08,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805385804] [2021-06-12 22:33:08,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805385804] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:08,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303349132] [2021-06-12 22:33:08,344 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 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 [2021-06-12 22:33:08,377 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-12 22:33:08,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:08,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 39 conjunts are in the unsatisfiable core [2021-06-12 22:33:08,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:08,456 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 11 treesize of output 7 [2021-06-12 22:33:08,463 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:33:08,465 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:33:08,465 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:33:08,465 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:33:08,470 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:08,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1303349132] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:08,471 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:08,471 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2021-06-12 22:33:08,471 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782322886] [2021-06-12 22:33:08,471 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-12 22:33:08,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:08,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-12 22:33:08,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2021-06-12 22:33:08,472 INFO L87 Difference]: Start difference. First operand 201 states and 419 transitions. Second operand has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 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) [2021-06-12 22:33:09,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:09,050 INFO L93 Difference]: Finished difference Result 415 states and 801 transitions. [2021-06-12 22:33:09,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-06-12 22:33:09,050 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 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 27 [2021-06-12 22:33:09,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:09,051 INFO L225 Difference]: With dead ends: 415 [2021-06-12 22:33:09,051 INFO L226 Difference]: Without dead ends: 249 [2021-06-12 22:33:09,052 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 592.4ms TimeCoverageRelationStatistics Valid=255, Invalid=1227, Unknown=0, NotChecked=0, Total=1482 [2021-06-12 22:33:09,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-06-12 22:33:09,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 61. [2021-06-12 22:33:09,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.9333333333333333) internal successors, (116), 60 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:09,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 116 transitions. [2021-06-12 22:33:09,055 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 116 transitions. Word has length 27 [2021-06-12 22:33:09,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:09,055 INFO L482 AbstractCegarLoop]: Abstraction has 61 states and 116 transitions. [2021-06-12 22:33:09,055 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 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) [2021-06-12 22:33:09,055 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 116 transitions. [2021-06-12 22:33:09,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-06-12 22:33:09,055 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:09,055 INFO L472 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:09,268 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-06-12 22:33:09,269 INFO L430 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:09,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:09,269 INFO L82 PathProgramCache]: Analyzing trace with hash 2102923853, now seen corresponding path program 17 times [2021-06-12 22:33:09,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:09,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542141327] [2021-06-12 22:33:09,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:09,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:09,350 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:09,350 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:09,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542141327] [2021-06-12 22:33:09,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542141327] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:09,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143452337] [2021-06-12 22:33:09,350 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 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 [2021-06-12 22:33:09,413 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-06-12 22:33:09,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:09,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 20 conjunts are in the unsatisfiable core [2021-06-12 22:33:09,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:09,500 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:09,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143452337] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:09,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:09,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-06-12 22:33:09,501 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697943917] [2021-06-12 22:33:09,501 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-06-12 22:33:09,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:09,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-06-12 22:33:09,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-06-12 22:33:09,502 INFO L87 Difference]: Start difference. First operand 61 states and 116 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 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) [2021-06-12 22:33:09,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:33:09,530 INFO L93 Difference]: Finished difference Result 318 states and 594 transitions. [2021-06-12 22:33:09,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-06-12 22:33:09,530 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 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 28 [2021-06-12 22:33:09,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:33:09,532 INFO L225 Difference]: With dead ends: 318 [2021-06-12 22:33:09,532 INFO L226 Difference]: Without dead ends: 297 [2021-06-12 22:33:09,532 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 57.3ms TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-06-12 22:33:09,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-06-12 22:33:09,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 237. [2021-06-12 22:33:09,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 2.093220338983051) internal successors, (494), 236 states have internal predecessors, (494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:09,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 494 transitions. [2021-06-12 22:33:09,538 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 494 transitions. Word has length 28 [2021-06-12 22:33:09,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:33:09,538 INFO L482 AbstractCegarLoop]: Abstraction has 237 states and 494 transitions. [2021-06-12 22:33:09,539 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 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) [2021-06-12 22:33:09,539 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 494 transitions. [2021-06-12 22:33:09,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-06-12 22:33:09,539 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:33:09,540 INFO L472 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:33:09,763 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:33:09,763 INFO L430 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:33:09,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:33:09,763 INFO L82 PathProgramCache]: Analyzing trace with hash 2072596664, now seen corresponding path program 18 times [2021-06-12 22:33:09,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:33:09,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461241891] [2021-06-12 22:33:09,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:33:09,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:33:10,093 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:10,094 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:33:10,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461241891] [2021-06-12 22:33:10,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461241891] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:10,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9592195] [2021-06-12 22:33:10,094 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 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 [2021-06-12 22:33:10,139 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-06-12 22:33:10,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:33:10,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 44 conjunts are in the unsatisfiable core [2021-06-12 22:33:10,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:33:48,041 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-06-12 22:33:48,041 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 14 treesize of output 10 [2021-06-12 22:33:48,043 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:33:48,048 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:33:48,050 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:33:48,050 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:20, output treesize:3 [2021-06-12 22:33:48,056 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 8 proven. 65 refuted. 37 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:33:48,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9592195] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:33:48,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:33:48,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 42 [2021-06-12 22:33:48,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118820467] [2021-06-12 22:33:48,057 INFO L462 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-06-12 22:33:48,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:33:48,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-06-12 22:33:48,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1532, Unknown=38, NotChecked=0, Total=1806 [2021-06-12 22:33:48,058 INFO L87 Difference]: Start difference. First operand 237 states and 494 transitions. Second operand has 43 states, 43 states have (on average 1.255813953488372) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:33:51,483 WARN L205 SmtUtils]: Spent 3.14 s on a formula simplification. DAG size of input: 66 DAG size of output: 57 [2021-06-12 22:33:54,619 WARN L205 SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-06-12 22:33:55,013 WARN L205 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-06-12 22:33:55,920 WARN L205 SmtUtils]: Spent 865.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 41 [2021-06-12 22:33:58,546 WARN L205 SmtUtils]: Spent 2.56 s on a formula simplification. DAG size of input: 54 DAG size of output: 37 [2021-06-12 22:34:00,358 WARN L205 SmtUtils]: Spent 662.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 40 [2021-06-12 22:34:05,483 WARN L205 SmtUtils]: Spent 3.35 s on a formula simplification. DAG size of input: 59 DAG size of output: 42 [2021-06-12 22:34:11,383 WARN L205 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-06-12 22:34:11,897 WARN L205 SmtUtils]: Spent 369.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-06-12 22:34:14,362 WARN L205 SmtUtils]: Spent 2.38 s on a formula simplification that was a NOOP. DAG size: 46 [2021-06-12 22:34:15,587 WARN L205 SmtUtils]: Spent 908.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 33 [2021-06-12 22:34:20,758 WARN L205 SmtUtils]: Spent 5.12 s on a formula simplification. DAG size of input: 65 DAG size of output: 30 [2021-06-12 22:34:33,015 WARN L205 SmtUtils]: Spent 676.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-06-12 22:34:40,004 WARN L205 SmtUtils]: Spent 915.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-06-12 22:34:46,514 WARN L205 SmtUtils]: Spent 2.45 s on a formula simplification. DAG size of input: 56 DAG size of output: 38 [2021-06-12 22:35:03,218 WARN L205 SmtUtils]: Spent 407.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-06-12 22:35:06,534 WARN L205 SmtUtils]: Spent 335.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-06-12 22:35:13,864 WARN L205 SmtUtils]: Spent 870.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 34 [2021-06-12 22:35:18,126 WARN L205 SmtUtils]: Spent 1.66 s on a formula simplification. DAG size of input: 47 DAG size of output: 30 [2021-06-12 22:35:27,248 WARN L205 SmtUtils]: Spent 7.07 s on a formula simplification that was a NOOP. DAG size: 63 [2021-06-12 22:35:41,734 WARN L205 SmtUtils]: Spent 792.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-06-12 22:35:45,384 WARN L205 SmtUtils]: Spent 670.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-06-12 22:35:52,779 WARN L205 SmtUtils]: Spent 5.20 s on a formula simplification that was a NOOP. DAG size: 54 [2021-06-12 22:36:16,569 WARN L205 SmtUtils]: Spent 722.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-06-12 22:36:26,133 WARN L205 SmtUtils]: Spent 318.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-06-12 22:36:41,766 WARN L205 SmtUtils]: Spent 757.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-06-12 22:36:52,170 WARN L205 SmtUtils]: Spent 4.53 s on a formula simplification that was a NOOP. DAG size: 45 [2021-06-12 22:37:00,473 WARN L205 SmtUtils]: Spent 5.15 s on a formula simplification. DAG size of input: 61 DAG size of output: 52 [2021-06-12 22:37:29,378 WARN L205 SmtUtils]: Spent 2.37 s on a formula simplification that was a NOOP. DAG size: 39 [2021-06-12 22:37:37,158 WARN L205 SmtUtils]: Spent 2.34 s on a formula simplification that was a NOOP. DAG size: 36 [2021-06-12 22:37:51,135 WARN L205 SmtUtils]: Spent 5.17 s on a formula simplification that was a NOOP. DAG size: 52 [2021-06-12 22:38:22,815 WARN L205 SmtUtils]: Spent 667.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2021-06-12 22:38:37,193 WARN L205 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2021-06-12 22:38:57,240 WARN L205 SmtUtils]: Spent 2.38 s on a formula simplification that was a NOOP. DAG size: 37 [2021-06-12 22:39:09,151 WARN L205 SmtUtils]: Spent 1.46 s on a formula simplification. DAG size of input: 43 DAG size of output: 25 [2021-06-12 22:39:47,016 WARN L205 SmtUtils]: Spent 679.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-06-12 22:40:03,592 WARN L205 SmtUtils]: Spent 693.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-06-12 22:40:45,241 WARN L205 SmtUtils]: Spent 623.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2021-06-12 22:40:59,021 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2021-06-12 22:41:37,743 WARN L205 SmtUtils]: Spent 2.37 s on a formula simplification that was a NOOP. DAG size: 35 [2021-06-12 22:42:09,729 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-06-12 22:42:54,574 WARN L205 SmtUtils]: Spent 642.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-06-12 22:43:59,742 WARN L205 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-06-12 22:44:28,108 WARN L205 SmtUtils]: Spent 294.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-06-12 22:45:45,699 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-06-12 22:45:52,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:45:52,650 INFO L93 Difference]: Finished difference Result 1829 states and 3550 transitions. [2021-06-12 22:45:52,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-06-12 22:45:52,651 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.255813953488372) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-06-12 22:45:52,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:45:52,655 INFO L225 Difference]: With dead ends: 1829 [2021-06-12 22:45:52,655 INFO L226 Difference]: Without dead ends: 1090 [2021-06-12 22:45:52,659 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6352 ImplicationChecksByTransitivity, 731412.5ms TimeCoverageRelationStatistics Valid=3552, Invalid=16798, Unknown=242, NotChecked=0, Total=20592 [2021-06-12 22:45:52,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1090 states. [2021-06-12 22:45:52,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1090 to 252. [2021-06-12 22:45:52,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 251 states have (on average 2.095617529880478) internal successors, (526), 251 states have internal predecessors, (526), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:45:52,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 526 transitions. [2021-06-12 22:45:52,669 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 526 transitions. Word has length 29 [2021-06-12 22:45:52,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:45:52,670 INFO L482 AbstractCegarLoop]: Abstraction has 252 states and 526 transitions. [2021-06-12 22:45:52,670 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.255813953488372) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:45:52,670 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 526 transitions. [2021-06-12 22:45:52,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-06-12 22:45:52,670 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:45:52,671 INFO L472 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:45:52,876 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:45:52,882 INFO L430 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:45:52,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:45:52,883 INFO L82 PathProgramCache]: Analyzing trace with hash 747055510, now seen corresponding path program 19 times [2021-06-12 22:45:52,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:45:52,883 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724372358] [2021-06-12 22:45:52,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:45:52,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:45:53,209 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:45:53,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:45:53,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724372358] [2021-06-12 22:45:53,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724372358] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:45:53,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399550595] [2021-06-12 22:45:53,209 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 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 [2021-06-12 22:45:53,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:45:53,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 47 conjunts are in the unsatisfiable core [2021-06-12 22:45:53,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:45:53,304 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 11 treesize of output 7 [2021-06-12 22:45:53,306 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:45:53,307 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:45:53,308 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:45:53,308 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-06-12 22:45:53,312 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:45:53,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1399550595] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:45:53,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:45:53,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2021-06-12 22:45:53,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741017673] [2021-06-12 22:45:53,312 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-12 22:45:53,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:45:53,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-12 22:45:53,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2021-06-12 22:45:53,313 INFO L87 Difference]: Start difference. First operand 252 states and 526 transitions. Second operand has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 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) [2021-06-12 22:45:54,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:45:54,016 INFO L93 Difference]: Finished difference Result 541 states and 1052 transitions. [2021-06-12 22:45:54,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-06-12 22:45:54,016 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 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 31 [2021-06-12 22:45:54,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:45:54,017 INFO L225 Difference]: With dead ends: 541 [2021-06-12 22:45:54,017 INFO L226 Difference]: Without dead ends: 343 [2021-06-12 22:45:54,018 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 786.4ms TimeCoverageRelationStatistics Valid=355, Invalid=1807, Unknown=0, NotChecked=0, Total=2162 [2021-06-12 22:45:54,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2021-06-12 22:45:54,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 71. [2021-06-12 22:45:54,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.9428571428571428) internal successors, (136), 70 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:45:54,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 136 transitions. [2021-06-12 22:45:54,021 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 136 transitions. Word has length 31 [2021-06-12 22:45:54,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:45:54,021 INFO L482 AbstractCegarLoop]: Abstraction has 71 states and 136 transitions. [2021-06-12 22:45:54,022 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 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) [2021-06-12 22:45:54,022 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 136 transitions. [2021-06-12 22:45:54,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-06-12 22:45:54,022 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:45:54,022 INFO L472 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:45:54,228 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-12 22:45:54,229 INFO L430 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:45:54,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:45:54,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1684610253, now seen corresponding path program 20 times [2021-06-12 22:45:54,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:45:54,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749326761] [2021-06-12 22:45:54,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:45:54,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:45:54,332 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:45:54,332 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:45:54,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749326761] [2021-06-12 22:45:54,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749326761] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:45:54,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304474650] [2021-06-12 22:45:54,333 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 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 [2021-06-12 22:45:54,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-12 22:45:54,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:45:54,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 24 conjunts are in the unsatisfiable core [2021-06-12 22:45:54,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:45:54,453 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:45:54,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304474650] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:45:54,453 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:45:54,453 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2021-06-12 22:45:54,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708556178] [2021-06-12 22:45:54,454 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-06-12 22:45:54,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:45:54,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-06-12 22:45:54,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2021-06-12 22:45:54,454 INFO L87 Difference]: Start difference. First operand 71 states and 136 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) 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) [2021-06-12 22:45:54,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 22:45:54,487 INFO L93 Difference]: Finished difference Result 415 states and 782 transitions. [2021-06-12 22:45:54,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-06-12 22:45:54,488 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) 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 32 [2021-06-12 22:45:54,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 22:45:54,489 INFO L225 Difference]: With dead ends: 415 [2021-06-12 22:45:54,489 INFO L226 Difference]: Without dead ends: 390 [2021-06-12 22:45:54,489 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 74.5ms TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2021-06-12 22:45:54,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2021-06-12 22:45:54,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 318. [2021-06-12 22:45:54,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 317 states have (on average 2.088328075709779) internal successors, (662), 317 states have internal predecessors, (662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:45:54,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 662 transitions. [2021-06-12 22:45:54,496 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 662 transitions. Word has length 32 [2021-06-12 22:45:54,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 22:45:54,497 INFO L482 AbstractCegarLoop]: Abstraction has 318 states and 662 transitions. [2021-06-12 22:45:54,497 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2857142857142856) 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) [2021-06-12 22:45:54,497 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 662 transitions. [2021-06-12 22:45:54,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-06-12 22:45:54,498 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 22:45:54,498 INFO L472 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 22:45:54,712 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-06-12 22:45:54,713 INFO L430 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-12 22:45:54,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 22:45:54,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1370435000, now seen corresponding path program 21 times [2021-06-12 22:45:54,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 22:45:54,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297624344] [2021-06-12 22:45:54,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 22:45:54,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 22:45:55,061 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:45:55,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 22:45:55,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297624344] [2021-06-12 22:45:55,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297624344] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:45:55,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564146227] [2021-06-12 22:45:55,061 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 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 [2021-06-12 22:45:55,109 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-06-12 22:45:55,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-12 22:45:55,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 52 conjunts are in the unsatisfiable core [2021-06-12 22:45:55,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-12 22:46:41,163 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-06-12 22:46:41,164 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 14 treesize of output 10 [2021-06-12 22:46:41,165 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-12 22:46:41,169 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-12 22:46:41,170 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-12 22:46:41,170 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:20, output treesize:3 [2021-06-12 22:46:41,174 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 8 proven. 90 refuted. 58 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 22:46:41,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564146227] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-12 22:46:41,174 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-12 22:46:41,174 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2021-06-12 22:46:41,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657660129] [2021-06-12 22:46:41,174 INFO L462 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-06-12 22:46:41,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 22:46:41,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-06-12 22:46:41,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=2172, Unknown=61, NotChecked=0, Total=2550 [2021-06-12 22:46:41,175 INFO L87 Difference]: Start difference. First operand 318 states and 662 transitions. Second operand has 51 states, 51 states have (on average 1.2156862745098038) internal successors, (62), 50 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 22:46:49,175 WARN L205 SmtUtils]: Spent 7.64 s on a formula simplification. DAG size of input: 82 DAG size of output: 66 [2021-06-12 22:46:52,664 WARN L205 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 73 DAG size of output: 51 [2021-06-12 22:46:55,699 WARN L205 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 66 DAG size of output: 43 [2021-06-12 22:46:55,884 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 39 [2021-06-12 22:46:56,448 WARN L205 SmtUtils]: Spent 383.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-06-12 22:46:58,262 WARN L205 SmtUtils]: Spent 1.60 s on a formula simplification. DAG size of input: 65 DAG size of output: 58 [2021-06-12 22:46:59,283 WARN L205 SmtUtils]: Spent 805.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 45 [2021-06-12 22:47:00,753 WARN L205 SmtUtils]: Spent 1.23 s on a formula simplification that was a NOOP. DAG size: 57 [2021-06-12 22:47:01,850 WARN L205 SmtUtils]: Spent 942.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 47 [2021-06-12 22:47:02,404 WARN L205 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 36 [2021-06-12 22:47:04,221 WARN L205 SmtUtils]: Spent 1.77 s on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-06-12 22:47:06,157 WARN L205 SmtUtils]: Spent 403.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-06-12 22:47:08,187 WARN L205 SmtUtils]: Spent 1.39 s on a formula simplification that was a NOOP. DAG size: 61 [2021-06-12 22:47:10,069 WARN L205 SmtUtils]: Spent 1.58 s on a formula simplification. DAG size of input: 59 DAG size of output: 52 [2021-06-12 22:47:11,743 WARN L205 SmtUtils]: Spent 1.48 s on a formula simplification. DAG size of input: 65 DAG size of output: 33 Received shutdown request... [2021-06-12 22:47:18,310 WARN L222 SmtUtils]: Removed 4 from assertion stack [2021-06-12 22:47:18,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-06-12 22:47:18,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-06-12 22:47:18,511 WARN L547 AbstractCegarLoop]: Verification canceled [2021-06-12 22:47:18,512 INFO L247 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2021-06-12 22:47:18,514 WARN L196 ceAbstractionStarter]: Timeout [2021-06-12 22:47:18,514 INFO L202 PluginConnector]: Adding new model context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.06 10:47:18 BasicIcfg [2021-06-12 22:47:18,514 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-06-12 22:47:18,514 INFO L168 Benchmark]: Toolchain (without parser) took 884630.78 ms. Allocated memory was 177.2 MB in the beginning and 219.2 MB in the end (delta: 41.9 MB). Free memory was 157.1 MB in the beginning and 169.3 MB in the end (delta: -12.2 MB). Peak memory consumption was 30.5 MB. Max. memory is 8.0 GB. [2021-06-12 22:47:18,514 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.09 ms. Allocated memory is still 177.2 MB. Free memory is still 158.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-06-12 22:47:18,514 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.22 ms. Allocated memory is still 177.2 MB. Free memory was 157.1 MB in the beginning and 155.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-06-12 22:47:18,514 INFO L168 Benchmark]: Boogie Preprocessor took 12.39 ms. Allocated memory is still 177.2 MB. Free memory was 155.5 MB in the beginning and 154.6 MB in the end (delta: 900.4 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-06-12 22:47:18,514 INFO L168 Benchmark]: RCFGBuilder took 221.04 ms. Allocated memory is still 177.2 MB. Free memory was 154.6 MB in the beginning and 143.3 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2021-06-12 22:47:18,514 INFO L168 Benchmark]: TraceAbstraction took 884373.09 ms. Allocated memory was 177.2 MB in the beginning and 219.2 MB in the end (delta: 41.9 MB). Free memory was 142.8 MB in the beginning and 169.3 MB in the end (delta: -26.5 MB). Peak memory consumption was 15.8 MB. Max. memory is 8.0 GB. [2021-06-12 22:47:18,515 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 0.09 ms. Allocated memory is still 177.2 MB. Free memory is still 158.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 20.22 ms. Allocated memory is still 177.2 MB. Free memory was 157.1 MB in the beginning and 155.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 12.39 ms. Allocated memory is still 177.2 MB. Free memory was 155.5 MB in the beginning and 154.6 MB in the end (delta: 900.4 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 221.04 ms. Allocated memory is still 177.2 MB. Free memory was 154.6 MB in the beginning and 143.3 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 884373.09 ms. Allocated memory was 177.2 MB in the beginning and 219.2 MB in the end (delta: 41.9 MB). Free memory was 142.8 MB in the beginning and 169.3 MB in the end (delta: -26.5 MB). Peak memory consumption was 15.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 47]: Timeout (TraceAbstraction) Unable to prove that assertion always holds Cancelled while BasicCegarLoop was constructing difference of abstraction (318states) and FLOYD_HOARE automaton (currently 54 states, 51 states before enhancement),while PredicateUnifier was unifying predicates,while SimplifyDDAWithTimeout was simplifying term of DAG size 79 for 6512ms.. - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: ULTIMATE.start with 1 thread instances CFG has 5 procedures, 20 locations, 3 error locations. Started 1 CEGAR loops. VerificationResult: TIMEOUT, OverallTime: 884305.8ms, OverallIterations: 23, TraceHistogramMax: 12, EmptinessCheckTime: 23.2ms, AutomataDifference: 783864.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 14.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 840 SDtfs, 4444 SDslu, 8385 SDs, 0 SdLazy, 2604 SolverSat, 1333 SolverUnsat, 65 SolverUnknown, 0 SolverNotchecked, 32851.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1047 GetRequests, 468 SyntacticMatches, 19 SemanticMatches, 559 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9283 ImplicationChecksByTransitivity, 835539.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=318occurred in iteration=22, InterpolantAutomatonStates: 349, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 144.2ms AutomataMinimizationTime, 22 MinimizatonAttempts, 2206 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 108.2ms SsaConstructionTime, 491.0ms SatisfiabilityAnalysisTime, 94473.2ms InterpolantComputationTime, 939 NumberOfCodeBlocks, 939 NumberOfCodeBlocksAsserted, 85 NumberOfCheckSat, 895 ConstructedInterpolants, 34 QuantifiedInterpolants, 4289 SizeOfPredicates, 12 NumberOfNonLiveVariables, 1966 ConjunctsInSsa, 475 ConjunctsInUnsatCore, 44 InterpolantComputations, 2 PerfectInterpolantSequences, 591/2481 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