/usr/bin/java -Xmx16000000000 -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/unroll-cond-5.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-2abb09bbbae98a04ae2fcc735832bfdba44f6fbc-2abb09b [2021-06-05 21:31:24,054 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-05 21:31:24,056 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-05 21:31:24,094 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-06-05 21:31:24,150 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 [2021-06-05 21:31:24,184 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-05 21:31:24,184 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-05 21:31:24,184 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-06-05 21:31:24,185 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-06-05 21:31:24,187 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-05 21:31:24,187 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-05 21:31:24,187 INFO L138 SettingsManager]: * Use SBE=true [2021-06-05 21:31:24,188 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-05 21:31:24,188 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-05 21:31:24,188 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-05 21:31:24,188 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-05 21:31:24,189 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-05 21:31:24,189 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-05 21:31:24,189 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-05 21:31:24,189 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-05 21:31:24,189 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-05 21:31:24,189 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-05 21:31:24,190 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-05 21:31:24,190 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-05 21:31:24,190 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-05 21:31:24,190 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-05 21:31:24,190 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-05 21:31:24,190 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-05 21:31:24,190 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-05 21:31:24,191 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-05 21:31:24,191 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-05 21:31:24,191 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-05 21:31:24,191 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-05 21:31:24,191 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-05 21:31:24,191 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-05 21:31:24,192 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-06-05 21:31:24,192 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-05 21:31:24,534 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-05 21:31:24,559 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-05 21:31:24,561 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-05 21:31:24,562 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-05 21:31:24,563 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-05 21:31:24,564 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/unroll-cond-5.wvr.bpl [2021-06-05 21:31:24,564 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/unroll-cond-5.wvr.bpl' [2021-06-05 21:31:24,610 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-05 21:31:24,613 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-05 21:31:24,614 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-05 21:31:24,614 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-05 21:31:24,614 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-05 21:31:24,625 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,633 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,639 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-05 21:31:24,641 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-05 21:31:24,641 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-05 21:31:24,642 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-05 21:31:24,648 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,648 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,656 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,657 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,663 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,666 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,668 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/1) ... [2021-06-05 21:31:24,671 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-05 21:31:24,672 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-05 21:31:24,672 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-05 21:31:24,672 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-05 21:31:24,675 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (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 [2021-06-05 21:31:24,748 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-06-05 21:31:24,748 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-06-05 21:31:24,749 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-06-05 21:31:24,749 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-06-05 21:31:24,749 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-06-05 21:31:24,749 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-06-05 21:31:24,749 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-06-05 21:31:24,749 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-05 21:31:24,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-05 21:31:24,750 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-06-05 21:31:25,119 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-05 21:31:25,120 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-06-05 21:31:25,120 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread1EXIT is neither atomic block end nor error location. [2021-06-05 21:31:25,122 INFO L202 PluginConnector]: Adding new model unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.06 09:31:25 BoogieIcfgContainer [2021-06-05 21:31:25,122 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-05 21:31:25,123 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-05 21:31:25,123 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-05 21:31:25,126 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-05 21:31:25,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 09:31:24" (1/2) ... [2021-06-05 21:31:25,127 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1de66bbe and model type unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.06 09:31:25, skipping insertion in model container [2021-06-05 21:31:25,127 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.06 09:31:25" (2/2) ... [2021-06-05 21:31:25,130 INFO L111 eAbstractionObserver]: Analyzing ICFG unroll-cond-5.wvr.bpl [2021-06-05 21:31:25,134 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-06-05 21:31:25,134 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-05 21:31:25,135 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-06-05 21:31:25,135 INFO L471 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-05 21:31:25,169 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-06-05 21:31:25,189 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-06-05 21:31:25,221 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 21:31:25,221 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 21:31:25,222 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 21:31:25,222 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 21:31:25,222 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 21:31:25,223 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 21:31:25,226 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 21:31:25,226 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-06-05 21:31:25,236 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 21 places, 16 transitions, 48 flow [2021-06-05 21:31:25,244 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:31:25,246 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:31:25,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-06-05 21:31:25,251 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:31:25,251 INFO L554 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:31:25,252 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:31:25,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:31:25,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1938062105, now seen corresponding path program 1 times [2021-06-05 21:31:25,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:31:25,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273026802] [2021-06-05 21:31:25,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:31:25,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:31:25,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:31:25,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:31:25,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273026802] [2021-06-05 21:31:25,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273026802] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-05 21:31:25,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-05 21:31:25,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-05 21:31:25,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654765489] [2021-06-05 21:31:25,414 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-05 21:31:25,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:31:25,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-05 21:31:25,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-05 21:31:25,425 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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) [2021-06-05 21:31:25,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:31:25,460 INFO L93 Difference]: Finished difference Result 26 states and 43 transitions. [2021-06-05 21:31:25,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-05 21:31:25,461 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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 [2021-06-05 21:31:25,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:31:25,469 INFO L225 Difference]: With dead ends: 26 [2021-06-05 21:31:25,469 INFO L226 Difference]: Without dead ends: 18 [2021-06-05 21:31:25,470 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.1ms TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-06-05 21:31:25,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-06-05 21:31:25,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-06-05 21:31:25,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 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) [2021-06-05 21:31:25,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 32 transitions. [2021-06-05 21:31:25,493 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 32 transitions. Word has length 10 [2021-06-05 21:31:25,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:31:25,494 INFO L482 AbstractCegarLoop]: Abstraction has 18 states and 32 transitions. [2021-06-05 21:31:25,494 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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) [2021-06-05 21:31:25,494 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 32 transitions. [2021-06-05 21:31:25,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-06-05 21:31:25,495 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:31:25,495 INFO L554 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:31:25,495 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-06-05 21:31:25,495 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:31:25,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:31:25,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1613321831, now seen corresponding path program 2 times [2021-06-05 21:31:25,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:31:25,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798663841] [2021-06-05 21:31:25,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:31:25,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:31:25,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:31:25,553 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:31:25,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798663841] [2021-06-05 21:31:25,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798663841] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-05 21:31:25,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-05 21:31:25,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-05 21:31:25,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969579450] [2021-06-05 21:31:25,555 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-05 21:31:25,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:31:25,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-05 21:31:25,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-06-05 21:31:25,556 INFO L87 Difference]: Start difference. First operand 18 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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) [2021-06-05 21:31:25,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:31:25,598 INFO L93 Difference]: Finished difference Result 28 states and 51 transitions. [2021-06-05 21:31:25,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-06-05 21:31:25,599 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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 [2021-06-05 21:31:25,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:31:25,600 INFO L225 Difference]: With dead ends: 28 [2021-06-05 21:31:25,600 INFO L226 Difference]: Without dead ends: 23 [2021-06-05 21:31:25,601 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.5ms TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-06-05 21:31:25,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-06-05 21:31:25,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-06-05 21:31:25,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:31:25,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 35 transitions. [2021-06-05 21:31:25,605 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 35 transitions. Word has length 10 [2021-06-05 21:31:25,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:31:25,605 INFO L482 AbstractCegarLoop]: Abstraction has 20 states and 35 transitions. [2021-06-05 21:31:25,605 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 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) [2021-06-05 21:31:25,605 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 35 transitions. [2021-06-05 21:31:25,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-06-05 21:31:25,606 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:31:25,606 INFO L554 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:31:25,606 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-06-05 21:31:25,606 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:31:25,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:31:25,607 INFO L82 PathProgramCache]: Analyzing trace with hash -104131845, now seen corresponding path program 1 times [2021-06-05 21:31:25,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:31:25,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857091755] [2021-06-05 21:31:25,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:31:25,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:31:27,053 WARN L205 SmtUtils]: Spent 1.24 s on a formula simplification. DAG size of input: 5498 DAG size of output: 50 [2021-06-05 21:31:27,199 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 35 [2021-06-05 21:31:27,965 WARN L205 SmtUtils]: Spent 707.00 ms on a formula simplification. DAG size of input: 5496 DAG size of output: 12 [2021-06-05 21:31:27,984 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:31:27,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:31:27,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857091755] [2021-06-05 21:31:27,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857091755] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:31:27,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110265853] [2021-06-05 21:31:27,985 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 [2021-06-05 21:31:28,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:31:28,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-06-05 21:31:28,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:31:29,197 WARN L205 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 2125 DAG size of output: 13 [2021-06-05 21:31:29,233 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 [2021-06-05 21:31:29,235 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:31:29,237 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:31:29,237 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-05 21:31:29,238 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:3 [2021-06-05 21:31:29,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:31:29,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110265853] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:31:29,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:31:29,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-06-05 21:31:29,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474812260] [2021-06-05 21:31:29,245 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-06-05 21:31:29,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:31:29,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-06-05 21:31:29,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-06-05 21:31:29,246 INFO L87 Difference]: Start difference. First operand 20 states and 35 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) [2021-06-05 21:31:29,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:31:29,319 INFO L93 Difference]: Finished difference Result 30 states and 51 transitions. [2021-06-05 21:31:29,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-06-05 21:31:29,320 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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 11 [2021-06-05 21:31:29,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:31:29,321 INFO L225 Difference]: With dead ends: 30 [2021-06-05 21:31:29,321 INFO L226 Difference]: Without dead ends: 22 [2021-06-05 21:31:29,321 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 213.7ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-06-05 21:31:29,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-06-05 21:31:29,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-06-05 21:31:29,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:31:29,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 40 transitions. [2021-06-05 21:31:29,325 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 40 transitions. Word has length 11 [2021-06-05 21:31:29,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:31:29,325 INFO L482 AbstractCegarLoop]: Abstraction has 22 states and 40 transitions. [2021-06-05 21:31:29,325 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) [2021-06-05 21:31:29,325 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 40 transitions. [2021-06-05 21:31:29,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-06-05 21:31:29,326 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:31:29,326 INFO L554 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:31:29,549 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-06-05 21:31:29,549 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:31:29,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:31:29,550 INFO L82 PathProgramCache]: Analyzing trace with hash 639451515, now seen corresponding path program 2 times [2021-06-05 21:31:29,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:31:29,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286171829] [2021-06-05 21:31:29,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:31:29,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:31:30,459 WARN L205 SmtUtils]: Spent 773.00 ms on a formula simplification. DAG size of input: 5498 DAG size of output: 50 [2021-06-05 21:31:30,601 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 35 [2021-06-05 21:31:30,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:31:30,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:31:30,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286171829] [2021-06-05 21:31:30,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286171829] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:31:30,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1851697117] [2021-06-05 21:31:30,617 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 [2021-06-05 21:31:30,652 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 21:31:30,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:31:30,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-06-05 21:31:30,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:31:31,658 WARN L205 SmtUtils]: Spent 932.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 38 [2021-06-05 21:31:31,686 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 [2021-06-05 21:31:31,687 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:31:31,704 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:31:31,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 37 [2021-06-05 21:31:31,716 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-06-05 21:31:31,724 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:31:31,724 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 18 [2021-06-05 21:31:31,726 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 2 xjuncts. [2021-06-05 21:31:31,748 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:31:31,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 17 treesize of output 64 [2021-06-05 21:31:31,777 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2021-06-05 21:31:31,837 INFO L628 ElimStorePlain]: treesize reduction 61, result has 26.5 percent of original size [2021-06-05 21:31:31,838 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-06-05 21:31:31,838 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:108, output treesize:22 [2021-06-05 21:31:31,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:31:31,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1851697117] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:31:31,885 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:31:31,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-06-05 21:31:31,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769702421] [2021-06-05 21:31:31,888 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-06-05 21:31:31,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:31:31,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-06-05 21:31:31,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-06-05 21:31:31,889 INFO L87 Difference]: Start difference. First operand 22 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) [2021-06-05 21:31:31,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:31:31,966 INFO L93 Difference]: Finished difference Result 35 states and 68 transitions. [2021-06-05 21:31:31,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-06-05 21:31:31,966 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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 11 [2021-06-05 21:31:31,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:31:31,969 INFO L225 Difference]: With dead ends: 35 [2021-06-05 21:31:31,969 INFO L226 Difference]: Without dead ends: 30 [2021-06-05 21:31:31,969 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 209.6ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-06-05 21:31:31,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-06-05 21:31:31,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 22. [2021-06-05 21:31:31,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:31:31,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 40 transitions. [2021-06-05 21:31:31,974 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 40 transitions. Word has length 11 [2021-06-05 21:31:31,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:31:31,974 INFO L482 AbstractCegarLoop]: Abstraction has 22 states and 40 transitions. [2021-06-05 21:31:31,975 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) [2021-06-05 21:31:31,975 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 40 transitions. [2021-06-05 21:31:31,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-06-05 21:31:31,975 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:31:31,976 INFO L554 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:31:32,198 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:31:32,199 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:31:32,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:31:32,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1490595647, now seen corresponding path program 3 times [2021-06-05 21:31:32,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:31:32,199 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829906309] [2021-06-05 21:31:32,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:31:32,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:31:32,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:31:32,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:31:32,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829906309] [2021-06-05 21:31:32,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829906309] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:31:32,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217986438] [2021-06-05 21:31:32,270 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 [2021-06-05 21:31:32,304 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-06-05 21:31:32,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:31:32,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-06-05 21:31:32,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:08,160 WARN L205 SmtUtils]: Spent 3.58 m on a formula simplification. DAG size of input: 112621 DAG size of output: 44 [2021-06-05 21:35:08,270 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:08,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 37 [2021-06-05 21:35:08,280 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-06-05 21:35:08,288 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:08,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 18 [2021-06-05 21:35:08,290 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-06-05 21:35:08,292 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 [2021-06-05 21:35:08,294 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-06-05 21:35:08,330 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:08,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 17 treesize of output 64 [2021-06-05 21:35:08,387 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2021-06-05 21:35:08,446 INFO L628 ElimStorePlain]: treesize reduction 58, result has 27.5 percent of original size [2021-06-05 21:35:08,447 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-06-05 21:35:08,448 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:105, output treesize:22 [2021-06-05 21:35:08,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:08,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217986438] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:08,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:08,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-06-05 21:35:08,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644234612] [2021-06-05 21:35:08,487 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-06-05 21:35:08,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:08,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-06-05 21:35:08,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-06-05 21:35:08,493 INFO L87 Difference]: Start difference. First operand 22 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) [2021-06-05 21:35:08,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:08,607 INFO L93 Difference]: Finished difference Result 51 states and 88 transitions. [2021-06-05 21:35:08,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-06-05 21:35:08,607 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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 11 [2021-06-05 21:35:08,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:08,608 INFO L225 Difference]: With dead ends: 51 [2021-06-05 21:35:08,608 INFO L226 Difference]: Without dead ends: 41 [2021-06-05 21:35:08,608 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 160.3ms TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-06-05 21:35:08,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-06-05 21:35:08,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 26. [2021-06-05 21:35:08,611 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) [2021-06-05 21:35:08,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 46 transitions. [2021-06-05 21:35:08,611 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 46 transitions. Word has length 11 [2021-06-05 21:35:08,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:08,612 INFO L482 AbstractCegarLoop]: Abstraction has 26 states and 46 transitions. [2021-06-05 21:35:08,614 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 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) [2021-06-05 21:35:08,614 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 46 transitions. [2021-06-05 21:35:08,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-06-05 21:35:08,614 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:08,615 INFO L554 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:08,820 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:35:08,821 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:08,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:08,821 INFO L82 PathProgramCache]: Analyzing trace with hash 829331864, now seen corresponding path program 1 times [2021-06-05 21:35:08,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:08,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606100073] [2021-06-05 21:35:08,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:08,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:08,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:08,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:08,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606100073] [2021-06-05 21:35:08,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606100073] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-05 21:35:08,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-05 21:35:08,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-05 21:35:08,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258093330] [2021-06-05 21:35:08,845 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-05 21:35:08,845 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:08,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-05 21:35:08,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-06-05 21:35:08,846 INFO L87 Difference]: Start difference. First operand 26 states and 46 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 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) [2021-06-05 21:35:08,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:08,860 INFO L93 Difference]: Finished difference Result 29 states and 52 transitions. [2021-06-05 21:35:08,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-05 21:35:08,861 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 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 [2021-06-05 21:35:08,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:08,863 INFO L225 Difference]: With dead ends: 29 [2021-06-05 21:35:08,863 INFO L226 Difference]: Without dead ends: 29 [2021-06-05 21:35:08,863 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-06-05 21:35:08,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-06-05 21:35:08,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-06-05 21:35:08,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:08,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 49 transitions. [2021-06-05 21:35:08,868 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 49 transitions. Word has length 11 [2021-06-05 21:35:08,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:08,868 INFO L482 AbstractCegarLoop]: Abstraction has 27 states and 49 transitions. [2021-06-05 21:35:08,868 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 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) [2021-06-05 21:35:08,868 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 49 transitions. [2021-06-05 21:35:08,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 21:35:08,869 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:08,869 INFO L554 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:08,869 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-06-05 21:35:08,869 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:08,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:08,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1012365145, now seen corresponding path program 4 times [2021-06-05 21:35:08,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:08,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750257297] [2021-06-05 21:35:08,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:08,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:09,427 WARN L205 SmtUtils]: Spent 492.00 ms on a formula simplification. DAG size of input: 2846 DAG size of output: 46 [2021-06-05 21:35:09,534 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 31 [2021-06-05 21:35:10,401 WARN L205 SmtUtils]: Spent 813.00 ms on a formula simplification. DAG size of input: 5518 DAG size of output: 38 [2021-06-05 21:35:11,324 WARN L205 SmtUtils]: Spent 816.00 ms on a formula simplification. DAG size of input: 5516 DAG size of output: 13 [2021-06-05 21:35:11,341 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:11,341 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:11,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750257297] [2021-06-05 21:35:11,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [750257297] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:11,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104392552] [2021-06-05 21:35:11,342 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 [2021-06-05 21:35:11,369 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 21:35:11,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:11,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-06-05 21:35:11,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:12,329 WARN L205 SmtUtils]: Spent 843.00 ms on a formula simplification. DAG size of input: 2125 DAG size of output: 15 [2021-06-05 21:35:12,337 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:12,337 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-06-05 21:35:12,342 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:35:12,344 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:12,344 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-05 21:35:12,344 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:3 [2021-06-05 21:35:12,350 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:12,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104392552] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:12,350 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:12,350 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-06-05 21:35:12,350 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870101298] [2021-06-05 21:35:12,350 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-06-05 21:35:12,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:12,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-06-05 21:35:12,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-06-05 21:35:12,351 INFO L87 Difference]: Start difference. First operand 27 states and 49 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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) [2021-06-05 21:35:12,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:12,409 INFO L93 Difference]: Finished difference Result 37 states and 65 transitions. [2021-06-05 21:35:12,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-05 21:35:12,410 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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 12 [2021-06-05 21:35:12,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:12,410 INFO L225 Difference]: With dead ends: 37 [2021-06-05 21:35:12,410 INFO L226 Difference]: Without dead ends: 29 [2021-06-05 21:35:12,410 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 255.9ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-06-05 21:35:12,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-06-05 21:35:12,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-06-05 21:35:12,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 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) [2021-06-05 21:35:12,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-06-05 21:35:12,416 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-06-05 21:35:12,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:12,416 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-06-05 21:35:12,416 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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) [2021-06-05 21:35:12,416 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-06-05 21:35:12,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 21:35:12,416 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:12,416 INFO L554 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:12,620 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:35:12,621 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:12,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:12,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1755948505, now seen corresponding path program 5 times [2021-06-05 21:35:12,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:12,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730200550] [2021-06-05 21:35:12,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:12,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:13,596 WARN L205 SmtUtils]: Spent 918.00 ms on a formula simplification. DAG size of input: 2941 DAG size of output: 54 [2021-06-05 21:35:13,709 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 29 [2021-06-05 21:35:15,346 WARN L205 SmtUtils]: Spent 1.58 s on a formula simplification. DAG size of input: 5612 DAG size of output: 47 [2021-06-05 21:35:15,432 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:15,433 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:15,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730200550] [2021-06-05 21:35:15,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730200550] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:15,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529945925] [2021-06-05 21:35:15,433 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 [2021-06-05 21:35:15,466 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 21:35:15,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:15,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-06-05 21:35:15,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:16,387 WARN L205 SmtUtils]: Spent 850.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 32 [2021-06-05 21:35:16,411 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:16,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 37 [2021-06-05 21:35:16,419 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2021-06-05 21:35:16,451 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:16,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 19 treesize of output 64 [2021-06-05 21:35:16,483 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-06-05 21:35:16,490 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:16,490 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-06-05 21:35:16,492 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-06-05 21:35:16,538 INFO L628 ElimStorePlain]: treesize reduction 28, result has 53.3 percent of original size [2021-06-05 21:35:16,539 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-06-05 21:35:16,539 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 1 variables, input treesize:85, output treesize:32 [2021-06-05 21:35:16,597 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:16,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529945925] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:16,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:16,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-06-05 21:35:16,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990017592] [2021-06-05 21:35:16,598 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-06-05 21:35:16,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:16,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-06-05 21:35:16,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-06-05 21:35:16,599 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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) [2021-06-05 21:35:16,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:16,695 INFO L93 Difference]: Finished difference Result 43 states and 85 transitions. [2021-06-05 21:35:16,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-06-05 21:35:16,695 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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 12 [2021-06-05 21:35:16,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:16,696 INFO L225 Difference]: With dead ends: 43 [2021-06-05 21:35:16,696 INFO L226 Difference]: Without dead ends: 38 [2021-06-05 21:35:16,696 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 284.2ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-06-05 21:35:16,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-06-05 21:35:16,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 29. [2021-06-05 21:35:16,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 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) [2021-06-05 21:35:16,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-06-05 21:35:16,700 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-06-05 21:35:16,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:16,700 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-06-05 21:35:16,700 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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) [2021-06-05 21:35:16,700 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-06-05 21:35:16,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 21:35:16,701 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:16,701 INFO L554 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:16,901 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-06-05 21:35:16,902 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:16,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:16,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1687874659, now seen corresponding path program 6 times [2021-06-05 21:35:16,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:16,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029954891] [2021-06-05 21:35:16,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:16,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:17,391 WARN L205 SmtUtils]: Spent 425.00 ms on a formula simplification. DAG size of input: 2846 DAG size of output: 46 [2021-06-05 21:35:17,504 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:17,505 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:17,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029954891] [2021-06-05 21:35:17,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029954891] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:17,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258258838] [2021-06-05 21:35:17,505 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 [2021-06-05 21:35:17,526 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-06-05 21:35:17,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:17,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-06-05 21:35:17,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:17,681 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:17,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 37 [2021-06-05 21:35:17,690 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2021-06-05 21:35:17,717 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:17,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 19 treesize of output 64 [2021-06-05 21:35:17,739 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-06-05 21:35:17,745 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:17,745 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-06-05 21:35:17,747 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-06-05 21:35:17,789 INFO L628 ElimStorePlain]: treesize reduction 28, result has 53.3 percent of original size [2021-06-05 21:35:17,790 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-06-05 21:35:17,790 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 1 variables, input treesize:85, output treesize:32 [2021-06-05 21:35:17,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:17,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258258838] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:17,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:17,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-06-05 21:35:17,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206118570] [2021-06-05 21:35:17,840 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-06-05 21:35:17,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:17,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-06-05 21:35:17,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-06-05 21:35:17,840 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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) [2021-06-05 21:35:18,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:18,002 INFO L93 Difference]: Finished difference Result 61 states and 110 transitions. [2021-06-05 21:35:18,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-06-05 21:35:18,002 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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 12 [2021-06-05 21:35:18,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:18,003 INFO L225 Difference]: With dead ends: 61 [2021-06-05 21:35:18,003 INFO L226 Difference]: Without dead ends: 51 [2021-06-05 21:35:18,003 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 252.1ms TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-06-05 21:35:18,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-06-05 21:35:18,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 29. [2021-06-05 21:35:18,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 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) [2021-06-05 21:35:18,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-06-05 21:35:18,007 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-06-05 21:35:18,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:18,007 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-06-05 21:35:18,007 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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) [2021-06-05 21:35:18,008 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-06-05 21:35:18,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 21:35:18,008 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:18,008 INFO L554 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:18,208 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:35:18,209 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:18,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:18,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1945828854, now seen corresponding path program 1 times [2021-06-05 21:35:18,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:18,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462958901] [2021-06-05 21:35:18,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:18,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:18,243 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:18,243 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:18,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462958901] [2021-06-05 21:35:18,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462958901] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:18,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323482164] [2021-06-05 21:35:18,244 INFO L95 rtionOrderModulation]: Keeping assertion order 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 [2021-06-05 21:35:18,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:18,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core [2021-06-05 21:35:18,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:18,306 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:18,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323482164] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:18,307 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:18,307 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-06-05 21:35:18,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181361236] [2021-06-05 21:35:18,310 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-05 21:35:18,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:18,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-05 21:35:18,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-06-05 21:35:18,310 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:18,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:18,341 INFO L93 Difference]: Finished difference Result 59 states and 102 transitions. [2021-06-05 21:35:18,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-06-05 21:35:18,342 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-06-05 21:35:18,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:18,343 INFO L225 Difference]: With dead ends: 59 [2021-06-05 21:35:18,343 INFO L226 Difference]: Without dead ends: 59 [2021-06-05 21:35:18,343 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 18.6ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-06-05 21:35:18,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-06-05 21:35:18,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 30. [2021-06-05 21:35:18,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 2.0) internal successors, (58), 29 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:18,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 58 transitions. [2021-06-05 21:35:18,347 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 58 transitions. Word has length 12 [2021-06-05 21:35:18,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:18,347 INFO L482 AbstractCegarLoop]: Abstraction has 30 states and 58 transitions. [2021-06-05 21:35:18,347 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:18,347 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 58 transitions. [2021-06-05 21:35:18,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 21:35:18,348 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:18,348 INFO L554 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:18,552 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:35:18,553 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:18,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:18,553 INFO L82 PathProgramCache]: Analyzing trace with hash -115030948, now seen corresponding path program 2 times [2021-06-05 21:35:18,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:18,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575180190] [2021-06-05 21:35:18,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:18,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:18,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:18,574 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:18,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575180190] [2021-06-05 21:35:18,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575180190] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:18,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056116603] [2021-06-05 21:35:18,574 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 [2021-06-05 21:35:18,596 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 21:35:18,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:18,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core [2021-06-05 21:35:18,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:18,619 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:18,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056116603] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:18,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:18,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-06-05 21:35:18,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642311692] [2021-06-05 21:35:18,620 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-05 21:35:18,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:18,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-05 21:35:18,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-06-05 21:35:18,620 INFO L87 Difference]: Start difference. First operand 30 states and 58 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:18,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:18,661 INFO L93 Difference]: Finished difference Result 43 states and 82 transitions. [2021-06-05 21:35:18,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-05 21:35:18,661 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-06-05 21:35:18,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:18,662 INFO L225 Difference]: With dead ends: 43 [2021-06-05 21:35:18,662 INFO L226 Difference]: Without dead ends: 43 [2021-06-05 21:35:18,663 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 21.1ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-06-05 21:35:18,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-06-05 21:35:18,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 32. [2021-06-05 21:35:18,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 2.064516129032258) internal successors, (64), 31 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:18,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 64 transitions. [2021-06-05 21:35:18,665 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 64 transitions. Word has length 12 [2021-06-05 21:35:18,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:18,665 INFO L482 AbstractCegarLoop]: Abstraction has 32 states and 64 transitions. [2021-06-05 21:35:18,665 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:18,666 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 64 transitions. [2021-06-05 21:35:18,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 21:35:18,666 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:18,666 INFO L554 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:18,872 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-06-05 21:35:18,873 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:18,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:18,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1264033467, now seen corresponding path program 7 times [2021-06-05 21:35:18,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:18,873 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225386286] [2021-06-05 21:35:18,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:18,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:19,397 WARN L205 SmtUtils]: Spent 435.00 ms on a formula simplification. DAG size of input: 2845 DAG size of output: 42 [2021-06-05 21:35:20,253 WARN L205 SmtUtils]: Spent 765.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 25 [2021-06-05 21:35:21,091 WARN L205 SmtUtils]: Spent 771.00 ms on a formula simplification. DAG size of input: 5508 DAG size of output: 14 [2021-06-05 21:35:21,111 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:21,112 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:21,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225386286] [2021-06-05 21:35:21,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225386286] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:21,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799832322] [2021-06-05 21:35:21,112 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 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 [2021-06-05 21:35:21,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:21,134 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-06-05 21:35:21,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:22,058 WARN L205 SmtUtils]: Spent 832.00 ms on a formula simplification. DAG size of input: 2125 DAG size of output: 16 [2021-06-05 21:35:22,070 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:22,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-06-05 21:35:22,078 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:35:22,080 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:22,080 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-05 21:35:22,080 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:19, output treesize:3 [2021-06-05 21:35:22,085 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:22,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799832322] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:22,085 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:22,085 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-06-05 21:35:22,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878954535] [2021-06-05 21:35:22,086 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-05 21:35:22,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:22,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-05 21:35:22,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-06-05 21:35:22,086 INFO L87 Difference]: Start difference. First operand 32 states and 64 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-06-05 21:35:22,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:22,176 INFO L93 Difference]: Finished difference Result 42 states and 80 transitions. [2021-06-05 21:35:22,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-06-05 21:35:22,176 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 13 [2021-06-05 21:35:22,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:22,177 INFO L225 Difference]: With dead ends: 42 [2021-06-05 21:35:22,177 INFO L226 Difference]: Without dead ends: 34 [2021-06-05 21:35:22,177 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 203.8ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-06-05 21:35:22,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-06-05 21:35:22,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-06-05 21:35:22,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:22,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-06-05 21:35:22,179 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-06-05 21:35:22,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:22,179 INFO L482 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-06-05 21:35:22,179 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-06-05 21:35:22,180 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-06-05 21:35:22,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 21:35:22,180 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:22,180 INFO L554 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:22,381 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:35:22,381 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:22,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:22,381 INFO L82 PathProgramCache]: Analyzing trace with hash 2007616827, now seen corresponding path program 8 times [2021-06-05 21:35:22,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:22,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166903412] [2021-06-05 21:35:22,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:22,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:22,904 WARN L205 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 2845 DAG size of output: 42 [2021-06-05 21:35:23,767 WARN L205 SmtUtils]: Spent 777.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 25 [2021-06-05 21:35:23,812 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:23,813 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:23,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166903412] [2021-06-05 21:35:23,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166903412] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:23,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304939221] [2021-06-05 21:35:23,813 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 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 [2021-06-05 21:35:23,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 21:35:23,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:23,836 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-06-05 21:35:23,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:24,725 WARN L205 SmtUtils]: Spent 812.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 25 [2021-06-05 21:35:24,744 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:24,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-06-05 21:35:24,753 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:35:24,774 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:24,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-06-05 21:35:24,804 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-06-05 21:35:24,822 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-06-05 21:35:24,822 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-06-05 21:35:24,823 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-06-05 21:35:24,849 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:24,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304939221] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:24,850 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:24,850 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-06-05 21:35:24,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137994409] [2021-06-05 21:35:24,850 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-05 21:35:24,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:24,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-05 21:35:24,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-06-05 21:35:24,851 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-06-05 21:35:24,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:24,959 INFO L93 Difference]: Finished difference Result 48 states and 97 transitions. [2021-06-05 21:35:24,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-06-05 21:35:24,959 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 13 [2021-06-05 21:35:24,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:24,960 INFO L225 Difference]: With dead ends: 48 [2021-06-05 21:35:24,960 INFO L226 Difference]: Without dead ends: 43 [2021-06-05 21:35:24,960 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 214.3ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-06-05 21:35:24,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-06-05 21:35:24,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2021-06-05 21:35:24,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:24,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-06-05 21:35:24,963 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-06-05 21:35:24,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:24,963 INFO L482 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-06-05 21:35:24,963 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-06-05 21:35:24,963 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-06-05 21:35:24,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 21:35:24,963 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:24,964 INFO L554 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:25,184 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:35:25,185 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:25,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:25,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1436206337, now seen corresponding path program 9 times [2021-06-05 21:35:25,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:25,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448279399] [2021-06-05 21:35:25,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:25,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:25,714 WARN L205 SmtUtils]: Spent 449.00 ms on a formula simplification. DAG size of input: 2845 DAG size of output: 42 [2021-06-05 21:35:25,786 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:25,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:25,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448279399] [2021-06-05 21:35:25,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448279399] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:25,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691984074] [2021-06-05 21:35:25,786 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 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 [2021-06-05 21:35:25,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-06-05 21:35:25,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:25,811 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-06-05 21:35:25,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:26,695 WARN L205 SmtUtils]: Spent 834.00 ms on a formula simplification. DAG size of input: 1384 DAG size of output: 45 [2021-06-05 21:35:26,771 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:26,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-06-05 21:35:26,782 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:35:26,799 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:35:26,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-06-05 21:35:26,823 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-06-05 21:35:26,841 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-06-05 21:35:26,842 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-06-05 21:35:26,842 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-06-05 21:35:26,869 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:26,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691984074] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:26,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:26,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-06-05 21:35:26,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905893108] [2021-06-05 21:35:26,870 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-05 21:35:26,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:26,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-05 21:35:26,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-06-05 21:35:26,870 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-06-05 21:35:27,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:27,042 INFO L93 Difference]: Finished difference Result 73 states and 141 transitions. [2021-06-05 21:35:27,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-06-05 21:35:27,042 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 13 [2021-06-05 21:35:27,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:27,043 INFO L225 Difference]: With dead ends: 73 [2021-06-05 21:35:27,043 INFO L226 Difference]: Without dead ends: 63 [2021-06-05 21:35:27,043 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 267.5ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-06-05 21:35:27,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-06-05 21:35:27,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 34. [2021-06-05 21:35:27,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:27,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-06-05 21:35:27,045 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-06-05 21:35:27,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:27,046 INFO L482 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-06-05 21:35:27,046 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-06-05 21:35:27,046 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-06-05 21:35:27,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 21:35:27,046 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:27,046 INFO L554 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:27,256 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable96 [2021-06-05 21:35:27,257 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:27,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:27,257 INFO L82 PathProgramCache]: Analyzing trace with hash -2097470120, now seen corresponding path program 3 times [2021-06-05 21:35:27,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:27,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283349551] [2021-06-05 21:35:27,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:27,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:27,282 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:27,283 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:27,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283349551] [2021-06-05 21:35:27,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283349551] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:27,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464745893] [2021-06-05 21:35:27,283 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 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 [2021-06-05 21:35:27,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-06-05 21:35:27,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:27,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-06-05 21:35:27,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:27,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:27,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464745893] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:27,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:27,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-06-05 21:35:27,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903691060] [2021-06-05 21:35:27,337 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-05 21:35:27,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:27,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-05 21:35:27,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-06-05 21:35:27,338 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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) [2021-06-05 21:35:27,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:27,378 INFO L93 Difference]: Finished difference Result 86 states and 153 transitions. [2021-06-05 21:35:27,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-05 21:35:27,379 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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 13 [2021-06-05 21:35:27,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:27,379 INFO L225 Difference]: With dead ends: 86 [2021-06-05 21:35:27,379 INFO L226 Difference]: Without dead ends: 86 [2021-06-05 21:35:27,379 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 25.3ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-06-05 21:35:27,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-06-05 21:35:27,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 35. [2021-06-05 21:35:27,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 34 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:27,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 73 transitions. [2021-06-05 21:35:27,382 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 73 transitions. Word has length 13 [2021-06-05 21:35:27,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:27,382 INFO L482 AbstractCegarLoop]: Abstraction has 35 states and 73 transitions. [2021-06-05 21:35:27,382 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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) [2021-06-05 21:35:27,382 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 73 transitions. [2021-06-05 21:35:27,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 21:35:27,383 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:27,383 INFO L554 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:27,597 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2021-06-05 21:35:27,597 INFO L430 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:27,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:27,597 INFO L82 PathProgramCache]: Analyzing trace with hash 136637374, now seen corresponding path program 4 times [2021-06-05 21:35:27,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:27,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474163407] [2021-06-05 21:35:27,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:27,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:27,636 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:27,636 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:27,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474163407] [2021-06-05 21:35:27,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474163407] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:27,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610496253] [2021-06-05 21:35:27,636 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 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 [2021-06-05 21:35:27,660 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 21:35:27,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:27,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-06-05 21:35:27,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:35:27,685 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:27,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610496253] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:27,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:35:27,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-06-05 21:35:27,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153620461] [2021-06-05 21:35:27,686 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-05 21:35:27,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:35:27,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-05 21:35:27,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-06-05 21:35:27,686 INFO L87 Difference]: Start difference. First operand 35 states and 73 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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) [2021-06-05 21:35:27,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:35:27,732 INFO L93 Difference]: Finished difference Result 64 states and 118 transitions. [2021-06-05 21:35:27,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-06-05 21:35:27,732 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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 13 [2021-06-05 21:35:27,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:35:27,733 INFO L225 Difference]: With dead ends: 64 [2021-06-05 21:35:27,733 INFO L226 Difference]: Without dead ends: 64 [2021-06-05 21:35:27,733 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 49.2ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-06-05 21:35:27,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-06-05 21:35:27,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 35. [2021-06-05 21:35:27,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 34 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:35:27,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 73 transitions. [2021-06-05 21:35:27,736 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 73 transitions. Word has length 13 [2021-06-05 21:35:27,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:35:27,736 INFO L482 AbstractCegarLoop]: Abstraction has 35 states and 73 transitions. [2021-06-05 21:35:27,736 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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) [2021-06-05 21:35:27,736 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 73 transitions. [2021-06-05 21:35:27,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 21:35:27,736 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:35:27,737 INFO L554 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:35:27,940 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2021-06-05 21:35:27,941 INFO L430 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:35:27,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:35:27,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1085182591, now seen corresponding path program 10 times [2021-06-05 21:35:27,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:35:27,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485544862] [2021-06-05 21:35:27,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:35:27,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:35:28,003 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:35:28,003 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:35:28,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485544862] [2021-06-05 21:35:28,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485544862] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:35:28,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898277960] [2021-06-05 21:35:28,004 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 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 [2021-06-05 21:35:28,029 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 21:35:28,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:35:28,030 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-06-05 21:35:28,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:39:01,841 WARN L205 SmtUtils]: Spent 3.55 m on a formula simplification. DAG size of input: 112621 DAG size of output: 44 [2021-06-05 21:39:02,002 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:39:02,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-06-05 21:39:02,011 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:39:02,029 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:39:02,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-06-05 21:39:02,072 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-06-05 21:39:02,095 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-06-05 21:39:02,096 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-06-05 21:39:02,096 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-06-05 21:39:02,126 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:39:02,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898277960] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:39:02,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:39:02,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-06-05 21:39:02,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217085771] [2021-06-05 21:39:02,127 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-05 21:39:02,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:39:02,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-05 21:39:02,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-06-05 21:39:02,128 INFO L87 Difference]: Start difference. First operand 35 states and 73 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-06-05 21:39:02,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:39:02,461 INFO L93 Difference]: Finished difference Result 79 states and 145 transitions. [2021-06-05 21:39:02,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-06-05 21:39:02,462 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 13 [2021-06-05 21:39:02,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:39:02,462 INFO L225 Difference]: With dead ends: 79 [2021-06-05 21:39:02,462 INFO L226 Difference]: Without dead ends: 69 [2021-06-05 21:39:02,462 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 431.8ms TimeCoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2021-06-05 21:39:02,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-06-05 21:39:02,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 39. [2021-06-05 21:39:02,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 38 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:39:02,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 79 transitions. [2021-06-05 21:39:02,465 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 79 transitions. Word has length 13 [2021-06-05 21:39:02,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:39:02,465 INFO L482 AbstractCegarLoop]: Abstraction has 39 states and 79 transitions. [2021-06-05 21:39:02,465 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-06-05 21:39:02,465 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 79 transitions. [2021-06-05 21:39:02,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 21:39:02,466 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:39:02,466 INFO L554 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:39:02,672 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:39:02,673 INFO L430 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:39:02,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:39:02,673 INFO L82 PathProgramCache]: Analyzing trace with hash 674492952, now seen corresponding path program 5 times [2021-06-05 21:39:02,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:39:02,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82071895] [2021-06-05 21:39:02,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:39:02,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:39:02,715 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:39:02,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:39:02,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82071895] [2021-06-05 21:39:02,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82071895] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:39:02,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924256205] [2021-06-05 21:39:02,716 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 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 [2021-06-05 21:39:02,738 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-06-05 21:39:02,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:39:02,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-06-05 21:39:02,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:39:02,767 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:39:02,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924256205] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:39:02,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:39:02,767 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-06-05 21:39:02,767 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475046750] [2021-06-05 21:39:02,767 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-05 21:39:02,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:39:02,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-05 21:39:02,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-06-05 21:39:02,768 INFO L87 Difference]: Start difference. First operand 39 states and 79 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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) [2021-06-05 21:39:02,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:39:02,824 INFO L93 Difference]: Finished difference Result 64 states and 127 transitions. [2021-06-05 21:39:02,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-06-05 21:39:02,824 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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 13 [2021-06-05 21:39:02,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:39:02,825 INFO L225 Difference]: With dead ends: 64 [2021-06-05 21:39:02,825 INFO L226 Difference]: Without dead ends: 64 [2021-06-05 21:39:02,825 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 33.2ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-06-05 21:39:02,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-06-05 21:39:02,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 42. [2021-06-05 21:39:02,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 41 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:39:02,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 88 transitions. [2021-06-05 21:39:02,828 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 88 transitions. Word has length 13 [2021-06-05 21:39:02,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:39:02,828 INFO L482 AbstractCegarLoop]: Abstraction has 42 states and 88 transitions. [2021-06-05 21:39:02,828 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 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) [2021-06-05 21:39:02,828 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 88 transitions. [2021-06-05 21:39:02,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-06-05 21:39:02,828 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:39:02,829 INFO L554 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:39:03,048 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable133 [2021-06-05 21:39:03,048 INFO L430 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:39:03,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:39:03,049 INFO L82 PathProgramCache]: Analyzing trace with hash 475816857, now seen corresponding path program 11 times [2021-06-05 21:39:03,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:39:03,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686506453] [2021-06-05 21:39:03,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:39:03,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:39:03,561 WARN L205 SmtUtils]: Spent 428.00 ms on a formula simplification. DAG size of input: 2844 DAG size of output: 41 [2021-06-05 21:39:04,493 WARN L205 SmtUtils]: Spent 846.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 14 [2021-06-05 21:39:04,521 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:39:04,521 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:39:04,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686506453] [2021-06-05 21:39:04,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686506453] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:39:04,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542918313] [2021-06-05 21:39:04,521 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 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 [2021-06-05 21:39:04,546 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-06-05 21:39:04,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:39:04,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-06-05 21:39:04,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:40:47,806 WARN L205 SmtUtils]: Spent 1.72 m on a formula simplification. DAG size of input: 7792 DAG size of output: 48 [2021-06-05 21:40:47,860 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:40:47,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 23 treesize of output 64 [2021-06-05 21:40:47,886 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:40:47,887 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:40:47,887 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-05 21:40:47,887 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:3 [2021-06-05 21:40:47,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:40:47,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542918313] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:40:47,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:40:47,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-06-05 21:40:47,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472437198] [2021-06-05 21:40:47,892 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-05 21:40:47,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:40:47,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-05 21:40:47,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-06-05 21:40:47,893 INFO L87 Difference]: Start difference. First operand 42 states and 88 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 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) [2021-06-05 21:40:48,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:40:48,012 INFO L93 Difference]: Finished difference Result 54 states and 111 transitions. [2021-06-05 21:40:48,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-06-05 21:40:48,013 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 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 14 [2021-06-05 21:40:48,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:40:48,013 INFO L225 Difference]: With dead ends: 54 [2021-06-05 21:40:48,013 INFO L226 Difference]: Without dead ends: 49 [2021-06-05 21:40:48,013 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 167.7ms TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-06-05 21:40:48,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-06-05 21:40:48,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-06-05 21:40:48,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 2.152173913043478) internal successors, (99), 46 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:40:48,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 99 transitions. [2021-06-05 21:40:48,015 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 99 transitions. Word has length 14 [2021-06-05 21:40:48,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:40:48,016 INFO L482 AbstractCegarLoop]: Abstraction has 47 states and 99 transitions. [2021-06-05 21:40:48,016 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 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) [2021-06-05 21:40:48,016 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 99 transitions. [2021-06-05 21:40:48,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-06-05 21:40:48,017 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:40:48,017 INFO L554 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:40:48,217 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable134 [2021-06-05 21:40:48,217 INFO L430 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:40:48,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:40:48,218 INFO L82 PathProgramCache]: Analyzing trace with hash 2070544349, now seen corresponding path program 12 times [2021-06-05 21:40:48,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:40:48,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219429687] [2021-06-05 21:40:48,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:40:48,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:40:48,716 WARN L205 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 2844 DAG size of output: 41 [2021-06-05 21:40:48,776 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:40:48,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:40:48,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219429687] [2021-06-05 21:40:48,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219429687] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:40:48,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405161540] [2021-06-05 21:40:48,777 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 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 [2021-06-05 21:40:48,800 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-06-05 21:40:48,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:40:48,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-06-05 21:40:48,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:40:48,938 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:40:48,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 23 treesize of output 64 [2021-06-05 21:40:48,970 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-06-05 21:40:48,971 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-06-05 21:40:48,971 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-06-05 21:40:48,972 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:3 [2021-06-05 21:40:48,977 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:40:48,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405161540] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:40:48,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:40:48,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-06-05 21:40:48,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391731383] [2021-06-05 21:40:48,977 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-05 21:40:48,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:40:48,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-05 21:40:48,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-06-05 21:40:48,978 INFO L87 Difference]: Start difference. First operand 47 states and 99 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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) [2021-06-05 21:40:49,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:40:49,068 INFO L93 Difference]: Finished difference Result 65 states and 124 transitions. [2021-06-05 21:40:49,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-06-05 21:40:49,068 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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 14 [2021-06-05 21:40:49,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:40:49,068 INFO L225 Difference]: With dead ends: 65 [2021-06-05 21:40:49,068 INFO L226 Difference]: Without dead ends: 60 [2021-06-05 21:40:49,069 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 182.1ms TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-06-05 21:40:49,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-06-05 21:40:49,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 47. [2021-06-05 21:40:49,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 2.152173913043478) internal successors, (99), 46 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:40:49,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 99 transitions. [2021-06-05 21:40:49,071 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 99 transitions. Word has length 14 [2021-06-05 21:40:49,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:40:49,071 INFO L482 AbstractCegarLoop]: Abstraction has 47 states and 99 transitions. [2021-06-05 21:40:49,071 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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) [2021-06-05 21:40:49,071 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 99 transitions. [2021-06-05 21:40:49,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-06-05 21:40:49,072 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:40:49,072 INFO L554 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:40:49,276 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:40:49,277 INFO L430 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:40:49,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:40:49,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1409280566, now seen corresponding path program 6 times [2021-06-05 21:40:49,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:40:49,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487121305] [2021-06-05 21:40:49,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:40:49,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:40:49,306 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:40:49,306 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:40:49,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487121305] [2021-06-05 21:40:49,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487121305] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:40:49,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622592580] [2021-06-05 21:40:49,306 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 [2021-06-05 21:40:49,328 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-06-05 21:40:49,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 21:40:49,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-06-05 21:40:49,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:40:49,369 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:40:49,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622592580] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:40:49,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:40:49,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-06-05 21:40:49,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091192892] [2021-06-05 21:40:49,370 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-06-05 21:40:49,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:40:49,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-06-05 21:40:49,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-06-05 21:40:49,371 INFO L87 Difference]: Start difference. First operand 47 states and 99 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 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) [2021-06-05 21:40:49,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:40:49,406 INFO L93 Difference]: Finished difference Result 113 states and 207 transitions. [2021-06-05 21:40:49,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-06-05 21:40:49,407 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 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 14 [2021-06-05 21:40:49,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:40:49,407 INFO L225 Difference]: With dead ends: 113 [2021-06-05 21:40:49,407 INFO L226 Difference]: Without dead ends: 113 [2021-06-05 21:40:49,407 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 23.7ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-06-05 21:40:49,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-06-05 21:40:49,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 48. [2021-06-05 21:40:49,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 2.1914893617021276) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:40:49,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 103 transitions. [2021-06-05 21:40:49,410 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 103 transitions. Word has length 14 [2021-06-05 21:40:49,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:40:49,410 INFO L482 AbstractCegarLoop]: Abstraction has 48 states and 103 transitions. [2021-06-05 21:40:49,410 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 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) [2021-06-05 21:40:49,411 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 103 transitions. [2021-06-05 21:40:49,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-06-05 21:40:49,411 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:40:49,411 INFO L554 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:40:49,624 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable169 [2021-06-05 21:40:49,625 INFO L430 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:40:49,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:40:49,625 INFO L82 PathProgramCache]: Analyzing trace with hash -651579236, now seen corresponding path program 7 times [2021-06-05 21:40:49,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:40:49,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772387152] [2021-06-05 21:40:49,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:40:49,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:40:49,656 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:40:49,656 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:40:49,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772387152] [2021-06-05 21:40:49,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772387152] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:40:49,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351386485] [2021-06-05 21:40:49,656 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 [2021-06-05 21:40:49,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:40:49,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-06-05 21:40:49,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 21:40:49,725 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:40:49,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351386485] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:40:49,725 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 21:40:49,725 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-06-05 21:40:49,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64066005] [2021-06-05 21:40:49,725 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-06-05 21:40:49,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 21:40:49,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-06-05 21:40:49,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-06-05 21:40:49,726 INFO L87 Difference]: Start difference. First operand 48 states and 103 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 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) [2021-06-05 21:40:49,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 21:40:49,783 INFO L93 Difference]: Finished difference Result 106 states and 193 transitions. [2021-06-05 21:40:49,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-06-05 21:40:49,783 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 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 14 [2021-06-05 21:40:49,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 21:40:49,784 INFO L225 Difference]: With dead ends: 106 [2021-06-05 21:40:49,784 INFO L226 Difference]: Without dead ends: 106 [2021-06-05 21:40:49,784 INFO L810 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 40.8ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-06-05 21:40:49,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-06-05 21:40:49,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 49. [2021-06-05 21:40:49,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 48 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 21:40:49,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 107 transitions. [2021-06-05 21:40:49,787 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 107 transitions. Word has length 14 [2021-06-05 21:40:49,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 21:40:49,787 INFO L482 AbstractCegarLoop]: Abstraction has 49 states and 107 transitions. [2021-06-05 21:40:49,787 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 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) [2021-06-05 21:40:49,787 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 107 transitions. [2021-06-05 21:40:49,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-06-05 21:40:49,788 INFO L546 BasicCegarLoop]: Found error trace [2021-06-05 21:40:49,788 INFO L554 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 21:40:50,011 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 21:40:50,012 INFO L430 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 21:40:50,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 21:40:50,012 INFO L82 PathProgramCache]: Analyzing trace with hash 296965981, now seen corresponding path program 13 times [2021-06-05 21:40:50,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 21:40:50,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203747010] [2021-06-05 21:40:50,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 21:40:50,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:40:50,065 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 21:40:50,065 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 21:40:50,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203747010] [2021-06-05 21:40:50,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203747010] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 21:40:50,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522712256] [2021-06-05 21:40:50,065 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 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 [2021-06-05 21:40:50,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 21:40:50,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-06-05 21:40:50,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown