/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/context1.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-8a14012e553caa636f65c1137831746b6d9875cd-8a14012 [2021-08-06 15:36:39,122 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-06 15:36:39,125 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-06 15:36:39,179 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-08-06 15:36:39,221 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 [2021-08-06 15:36:39,241 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-06 15:36:39,241 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-06 15:36:39,241 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-06 15:36:39,241 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-06 15:36:39,242 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-06 15:36:39,243 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-06 15:36:39,243 INFO L138 SettingsManager]: * Use SBE=true [2021-08-06 15:36:39,243 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-06 15:36:39,243 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-06 15:36:39,243 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-06 15:36:39,244 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-06 15:36:39,244 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-06 15:36:39,244 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-06 15:36:39,244 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-06 15:36:39,244 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-06 15:36:39,245 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-06 15:36:39,245 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-06 15:36:39,245 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-06 15:36:39,245 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-06 15:36:39,245 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-06 15:36:39,246 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-06 15:36:39,246 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-08-06 15:36:39,246 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-06 15:36:39,246 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-06 15:36:39,247 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-06 15:36:39,247 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-06 15:36:39,247 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-06 15:36:39,247 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-06 15:36:39,247 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-06 15:36:39,248 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-08-06 15:36:39,248 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-06 15:36:39,248 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-08-06 15:36:39,527 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-06 15:36:39,552 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-06 15:36:39,554 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-06 15:36:39,555 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-08-06 15:36:39,558 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-08-06 15:36:39,558 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/context1.wvr.bpl [2021-08-06 15:36:39,559 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/context1.wvr.bpl' [2021-08-06 15:36:39,589 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-06 15:36:39,590 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-08-06 15:36:39,591 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-06 15:36:39,591 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-06 15:36:39,591 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-06 15:36:39,600 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,606 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,613 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-06 15:36:39,614 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-06 15:36:39,614 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-06 15:36:39,614 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-06 15:36:39,619 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,619 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,620 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,622 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,623 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,624 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,625 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-06 15:36:39,625 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-06 15:36:39,625 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-06 15:36:39,626 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-06 15:36:39,628 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/1) ... [2021-08-06 15:36:39,634 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-06 15:36:39,642 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:36:39,651 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-06 15:36:39,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-06 15:36:39,685 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-08-06 15:36:39,685 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-08-06 15:36:39,685 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-08-06 15:36:39,686 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-08-06 15:36:39,686 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-08-06 15:36:39,686 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-08-06 15:36:39,686 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-08-06 15:36:39,687 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-06 15:36:39,687 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-06 15:36:39,687 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-08-06 15:36:39,896 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-06 15:36:39,896 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-08-06 15:36:39,897 WARN L329 CfgBuilder]: Unexpected successor node of atomic block begin: thread1EXIT is neither atomic block end nor error location. [2021-08-06 15:36:39,897 WARN L329 CfgBuilder]: Unexpected successor node of atomic block begin: thread2EXIT is neither atomic block end nor error location. [2021-08-06 15:36:39,898 INFO L202 PluginConnector]: Adding new model context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.08 03:36:39 BoogieIcfgContainer [2021-08-06 15:36:39,898 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-06 15:36:39,900 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-06 15:36:39,900 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-06 15:36:39,902 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-06 15:36:39,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 06.08 03:36:39" (1/2) ... [2021-08-06 15:36:39,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19326ac0 and model type context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.08 03:36:39, skipping insertion in model container [2021-08-06 15:36:39,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.08 03:36:39" (2/2) ... [2021-08-06 15:36:39,904 INFO L111 eAbstractionObserver]: Analyzing ICFG context1.wvr.bpl [2021-08-06 15:36:39,908 WARN L149 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-08-06 15:36:39,908 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-06 15:36:39,908 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-06 15:36:39,908 INFO L509 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-08-06 15:36:39,934 INFO L148 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-08-06 15:36:39,971 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == ULTIMATE.start ======== [2021-08-06 15:36:39,976 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-06 15:36:39,977 INFO L340 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-08-06 15:36:39,984 INFO L111 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 20 places, 15 transitions, 46 flow [2021-08-06 15:36:39,993 INFO L133 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:39,995 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:39,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-08-06 15:36:40,000 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:36:40,000 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:36:40,001 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:36:40,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:36:40,005 INFO L82 PathProgramCache]: Analyzing trace with hash -778541899, now seen corresponding path program 1 times [2021-08-06 15:36:40,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:36:40,013 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597267505] [2021-08-06 15:36:40,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:36:40,014 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:36:40,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:36:40,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:40,178 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:36:40,178 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597267505] [2021-08-06 15:36:40,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597267505] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-06 15:36:40,179 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-06 15:36:40,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-08-06 15:36:40,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346977697] [2021-08-06 15:36:40,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-08-06 15:36:40,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:36:40,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-06 15:36:40,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-06 15:36:40,213 INFO L87 Difference]: Start difference. First operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:36:40,232 INFO L93 Difference]: Finished difference Result 20 states and 34 transitions. [2021-08-06 15:36:40,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-06 15:36:40,233 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-08-06 15:36:40,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:36:40,242 INFO L225 Difference]: With dead ends: 20 [2021-08-06 15:36:40,242 INFO L226 Difference]: Without dead ends: 16 [2021-08-06 15:36:40,244 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-06 15:36:40,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-08-06 15:36:40,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-08-06 15:36:40,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 27 transitions. [2021-08-06 15:36:40,322 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 27 transitions. Word has length 9 [2021-08-06 15:36:40,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:36:40,322 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 27 transitions. [2021-08-06 15:36:40,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,323 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 27 transitions. [2021-08-06 15:36:40,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-06 15:36:40,323 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:36:40,323 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:36:40,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-06 15:36:40,324 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:36:40,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:36:40,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1635730770, now seen corresponding path program 1 times [2021-08-06 15:36:40,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:36:40,328 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948704421] [2021-08-06 15:36:40,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:36:40,329 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:36:40,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:36:40,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:40,397 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:36:40,397 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948704421] [2021-08-06 15:36:40,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948704421] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-06 15:36:40,397 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-06 15:36:40,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-08-06 15:36:40,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348624791] [2021-08-06 15:36:40,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-08-06 15:36:40,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:36:40,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-06 15:36:40,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-06 15:36:40,402 INFO L87 Difference]: Start difference. First operand 16 states and 27 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:36:40,415 INFO L93 Difference]: Finished difference Result 21 states and 34 transitions. [2021-08-06 15:36:40,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-06 15:36:40,416 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-08-06 15:36:40,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:36:40,417 INFO L225 Difference]: With dead ends: 21 [2021-08-06 15:36:40,417 INFO L226 Difference]: Without dead ends: 18 [2021-08-06 15:36:40,418 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-06 15:36:40,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-08-06 15:36:40,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-08-06 15:36:40,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 30 transitions. [2021-08-06 15:36:40,427 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 30 transitions. Word has length 10 [2021-08-06 15:36:40,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:36:40,427 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 30 transitions. [2021-08-06 15:36:40,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,427 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 30 transitions. [2021-08-06 15:36:40,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-06 15:36:40,428 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:36:40,428 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:36:40,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-06 15:36:40,429 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:36:40,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:36:40,430 INFO L82 PathProgramCache]: Analyzing trace with hash -987197357, now seen corresponding path program 1 times [2021-08-06 15:36:40,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:36:40,431 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052258018] [2021-08-06 15:36:40,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:36:40,432 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:36:40,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:36:40,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:40,502 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:36:40,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052258018] [2021-08-06 15:36:40,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052258018] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:40,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875417799] [2021-08-06 15:36:40,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:36:40,503 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:36:40,503 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:36:40,515 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:36:40,516 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-06 15:36:40,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:36:40,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 7 conjunts are in the unsatisfiable core [2021-08-06 15:36:40,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:36:40,655 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 [2021-08-06 15:36:40,679 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:40,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875417799] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:40,680 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:36:40,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-08-06 15:36:40,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237531766] [2021-08-06 15:36:40,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-06 15:36:40,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:36:40,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-06 15:36:40,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-06 15:36:40,682 INFO L87 Difference]: Start difference. First operand 18 states and 30 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:36:40,709 INFO L93 Difference]: Finished difference Result 25 states and 43 transitions. [2021-08-06 15:36:40,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-06 15:36:40,709 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-08-06 15:36:40,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:36:40,710 INFO L225 Difference]: With dead ends: 25 [2021-08-06 15:36:40,710 INFO L226 Difference]: Without dead ends: 21 [2021-08-06 15:36:40,710 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 30.4ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-08-06 15:36:40,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-06 15:36:40,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-06 15:36:40,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 36 transitions. [2021-08-06 15:36:40,714 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 36 transitions. Word has length 11 [2021-08-06 15:36:40,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:36:40,715 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 36 transitions. [2021-08-06 15:36:40,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:40,715 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 36 transitions. [2021-08-06 15:36:40,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-08-06 15:36:40,715 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:36:40,716 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:36:40,744 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-06 15:36:40,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:36:40,939 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:36:40,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:36:40,940 INFO L82 PathProgramCache]: Analyzing trace with hash -537621132, now seen corresponding path program 2 times [2021-08-06 15:36:40,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:36:40,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909820779] [2021-08-06 15:36:40,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:36:40,940 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:36:40,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:36:40,990 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:40,990 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:36:40,990 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909820779] [2021-08-06 15:36:40,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909820779] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:40,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089128861] [2021-08-06 15:36:40,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-06 15:36:40,991 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:36:40,991 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:36:40,992 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:36:40,993 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-06 15:36:41,032 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-06 15:36:41,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:36:41,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2021-08-06 15:36:41,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:36:41,123 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:41,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2089128861] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:41,123 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:36:41,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-08-06 15:36:41,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56409384] [2021-08-06 15:36:41,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-08-06 15:36:41,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:36:41,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-06 15:36:41,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-08-06 15:36:41,125 INFO L87 Difference]: Start difference. First operand 21 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:41,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:36:41,134 INFO L93 Difference]: Finished difference Result 50 states and 82 transitions. [2021-08-06 15:36:41,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-06 15:36:41,135 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-08-06 15:36:41,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:36:41,137 INFO L225 Difference]: With dead ends: 50 [2021-08-06 15:36:41,137 INFO L226 Difference]: Without dead ends: 45 [2021-08-06 15:36:41,137 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.5ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-08-06 15:36:41,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-08-06 15:36:41,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2021-08-06 15:36:41,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.9375) internal successors, (62), 32 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:41,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 62 transitions. [2021-08-06 15:36:41,143 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 62 transitions. Word has length 12 [2021-08-06 15:36:41,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:36:41,143 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 62 transitions. [2021-08-06 15:36:41,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:41,143 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 62 transitions. [2021-08-06 15:36:41,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-08-06 15:36:41,144 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:36:41,144 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:36:41,172 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-06 15:36:41,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-08-06 15:36:41,361 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:36:41,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:36:41,362 INFO L82 PathProgramCache]: Analyzing trace with hash -25748427, now seen corresponding path program 3 times [2021-08-06 15:36:41,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:36:41,362 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055217772] [2021-08-06 15:36:41,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:36:41,362 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:36:41,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:36:41,456 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:41,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:36:41,457 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055217772] [2021-08-06 15:36:41,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055217772] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:41,457 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374379178] [2021-08-06 15:36:41,457 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-06 15:36:41,457 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:36:41,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:36:41,458 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:36:41,483 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-06 15:36:41,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-08-06 15:36:41,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:36:41,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2021-08-06 15:36:41,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:36:41,682 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 [2021-08-06 15:36:41,711 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:41,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374379178] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:41,711 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:36:41,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-08-06 15:36:41,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079362043] [2021-08-06 15:36:41,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-06 15:36:41,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:36:41,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-06 15:36:41,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-08-06 15:36:41,715 INFO L87 Difference]: Start difference. First operand 33 states and 62 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:41,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:36:41,789 INFO L93 Difference]: Finished difference Result 65 states and 115 transitions. [2021-08-06 15:36:41,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-06 15:36:41,790 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-08-06 15:36:41,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:36:41,792 INFO L225 Difference]: With dead ends: 65 [2021-08-06 15:36:41,793 INFO L226 Difference]: Without dead ends: 39 [2021-08-06 15:36:41,794 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 64.7ms TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-08-06 15:36:41,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-08-06 15:36:41,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 26. [2021-08-06 15:36:41,801 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) [2021-08-06 15:36:41,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 46 transitions. [2021-08-06 15:36:41,801 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 46 transitions. Word has length 13 [2021-08-06 15:36:41,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:36:41,802 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 46 transitions. [2021-08-06 15:36:41,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:41,802 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 46 transitions. [2021-08-06 15:36:41,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-08-06 15:36:41,802 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:36:41,802 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:36:41,826 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-06 15:36:42,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:36:42,013 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:36:42,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:36:42,014 INFO L82 PathProgramCache]: Analyzing trace with hash -797475374, now seen corresponding path program 4 times [2021-08-06 15:36:42,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:36:42,014 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436952892] [2021-08-06 15:36:42,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:36:42,014 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:36:42,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:36:42,085 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:42,085 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:36:42,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436952892] [2021-08-06 15:36:42,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436952892] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:42,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338524917] [2021-08-06 15:36:42,085 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-06 15:36:42,086 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:36:42,086 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:36:42,087 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:36:42,113 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-06 15:36:42,137 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-06 15:36:42,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:36:42,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-06 15:36:42,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:36:42,215 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:42,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338524917] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:42,216 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:36:42,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-08-06 15:36:42,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320935174] [2021-08-06 15:36:42,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-06 15:36:42,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:36:42,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-06 15:36:42,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-08-06 15:36:42,217 INFO L87 Difference]: Start difference. First operand 26 states and 46 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:42,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:36:42,229 INFO L93 Difference]: Finished difference Result 73 states and 125 transitions. [2021-08-06 15:36:42,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-06 15:36:42,230 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-08-06 15:36:42,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:36:42,230 INFO L225 Difference]: With dead ends: 73 [2021-08-06 15:36:42,230 INFO L226 Difference]: Without dead ends: 66 [2021-08-06 15:36:42,231 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.3ms TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-08-06 15:36:42,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-08-06 15:36:42,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 48. [2021-08-06 15:36:42,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 2.021276595744681) internal successors, (95), 47 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:42,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 95 transitions. [2021-08-06 15:36:42,237 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 95 transitions. Word has length 14 [2021-08-06 15:36:42,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:36:42,237 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 95 transitions. [2021-08-06 15:36:42,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:36:42,237 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 95 transitions. [2021-08-06 15:36:42,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-08-06 15:36:42,238 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:36:42,238 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:36:42,269 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-06 15:36:42,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:36:42,461 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:36:42,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:36:42,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1485922387, now seen corresponding path program 5 times [2021-08-06 15:36:42,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:36:42,462 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152694875] [2021-08-06 15:36:42,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:36:42,462 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:36:42,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:36:42,591 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:42,591 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:36:42,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152694875] [2021-08-06 15:36:42,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152694875] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:42,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813052146] [2021-08-06 15:36:42,592 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-06 15:36:42,592 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:36:42,592 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:36:42,593 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:36:42,593 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-06 15:36:42,654 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-08-06 15:36:42,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:36:42,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 16 conjunts are in the unsatisfiable core [2021-08-06 15:36:42,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:36:47,153 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-08-06 15:36:47,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 16 [2021-08-06 15:36:47,177 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 9 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:36:47,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813052146] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:36:47,178 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:36:47,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-08-06 15:36:47,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066025831] [2021-08-06 15:36:47,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-08-06 15:36:47,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:36:47,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-08-06 15:36:47,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=168, Unknown=2, NotChecked=0, Total=210 [2021-08-06 15:36:47,179 INFO L87 Difference]: Start difference. First operand 48 states and 95 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:09,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:09,886 INFO L93 Difference]: Finished difference Result 229 states and 428 transitions. [2021-08-06 15:37:09,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-08-06 15:37:09,887 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-08-06 15:37:09,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:09,888 INFO L225 Difference]: With dead ends: 229 [2021-08-06 15:37:09,888 INFO L226 Difference]: Without dead ends: 116 [2021-08-06 15:37:09,888 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 26712.0ms TimeCoverageRelationStatistics Valid=227, Invalid=820, Unknown=9, NotChecked=0, Total=1056 [2021-08-06 15:37:09,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-08-06 15:37:09,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 56. [2021-08-06 15:37:09,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 2.0545454545454547) internal successors, (113), 55 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:09,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 113 transitions. [2021-08-06 15:37:09,894 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 113 transitions. Word has length 15 [2021-08-06 15:37:09,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:09,894 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 113 transitions. [2021-08-06 15:37:09,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:09,894 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 113 transitions. [2021-08-06 15:37:09,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-08-06 15:37:09,895 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:09,895 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:09,929 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:10,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:10,112 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:10,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:10,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1563360331, now seen corresponding path program 6 times [2021-08-06 15:37:10,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:10,112 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909347477] [2021-08-06 15:37:10,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:10,112 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:10,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:10,250 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:10,250 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:10,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909347477] [2021-08-06 15:37:10,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [909347477] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:10,251 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607722766] [2021-08-06 15:37:10,251 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-06 15:37:10,251 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:10,251 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:10,257 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:10,258 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-06 15:37:10,316 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-08-06 15:37:10,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:10,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2021-08-06 15:37:10,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:10,452 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 [2021-08-06 15:37:10,472 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:10,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [607722766] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:10,473 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:10,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2021-08-06 15:37:10,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920668138] [2021-08-06 15:37:10,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-08-06 15:37:10,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:10,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-08-06 15:37:10,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-08-06 15:37:10,474 INFO L87 Difference]: Start difference. First operand 56 states and 113 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:10,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:10,645 INFO L93 Difference]: Finished difference Result 121 states and 226 transitions. [2021-08-06 15:37:10,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-06 15:37:10,646 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-08-06 15:37:10,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:10,646 INFO L225 Difference]: With dead ends: 121 [2021-08-06 15:37:10,646 INFO L226 Difference]: Without dead ends: 77 [2021-08-06 15:37:10,647 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 190.2ms TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-08-06 15:37:10,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-08-06 15:37:10,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 36. [2021-08-06 15:37:10,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 35 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:10,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 66 transitions. [2021-08-06 15:37:10,650 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 66 transitions. Word has length 17 [2021-08-06 15:37:10,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:10,650 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 66 transitions. [2021-08-06 15:37:10,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:10,650 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 66 transitions. [2021-08-06 15:37:10,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-08-06 15:37:10,651 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:10,651 INFO L512 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:10,675 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:10,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:10,852 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:10,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:10,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1218804142, now seen corresponding path program 7 times [2021-08-06 15:37:10,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:10,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509621286] [2021-08-06 15:37:10,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:10,853 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:10,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:10,913 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:10,913 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:10,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509621286] [2021-08-06 15:37:10,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509621286] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:10,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778773696] [2021-08-06 15:37:10,913 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-06 15:37:10,914 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:10,914 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:10,914 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:10,941 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-06 15:37:11,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:11,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-06 15:37:11,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:11,143 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:11,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778773696] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:11,144 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:11,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-08-06 15:37:11,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846000444] [2021-08-06 15:37:11,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-06 15:37:11,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:11,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-06 15:37:11,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-08-06 15:37:11,147 INFO L87 Difference]: Start difference. First operand 36 states and 66 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:11,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:11,166 INFO L93 Difference]: Finished difference Result 128 states and 229 transitions. [2021-08-06 15:37:11,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-06 15:37:11,167 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-08-06 15:37:11,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:11,167 INFO L225 Difference]: With dead ends: 128 [2021-08-06 15:37:11,167 INFO L226 Difference]: Without dead ends: 117 [2021-08-06 15:37:11,168 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.1ms TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-08-06 15:37:11,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-08-06 15:37:11,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 87. [2021-08-06 15:37:11,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 2.0813953488372094) internal successors, (179), 86 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:11,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 179 transitions. [2021-08-06 15:37:11,181 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 179 transitions. Word has length 18 [2021-08-06 15:37:11,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:11,182 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 179 transitions. [2021-08-06 15:37:11,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:11,182 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 179 transitions. [2021-08-06 15:37:11,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-08-06 15:37:11,183 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:11,183 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:11,208 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:11,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:11,401 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:11,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:11,401 INFO L82 PathProgramCache]: Analyzing trace with hash 47005779, now seen corresponding path program 8 times [2021-08-06 15:37:11,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:11,402 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086924706] [2021-08-06 15:37:11,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:11,402 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:11,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:11,585 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:11,586 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:11,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086924706] [2021-08-06 15:37:11,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086924706] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:11,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523782030] [2021-08-06 15:37:11,586 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-06 15:37:11,586 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:11,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:11,587 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:11,588 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-08-06 15:37:11,679 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-06 15:37:11,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:11,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 23 conjunts are in the unsatisfiable core [2021-08-06 15:37:11,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:11,826 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 [2021-08-06 15:37:11,853 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:11,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523782030] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:11,853 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:11,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2021-08-06 15:37:11,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21254016] [2021-08-06 15:37:11,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-06 15:37:11,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:11,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-06 15:37:11,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-08-06 15:37:11,854 INFO L87 Difference]: Start difference. First operand 87 states and 179 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:12,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:12,068 INFO L93 Difference]: Finished difference Result 179 states and 337 transitions. [2021-08-06 15:37:12,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-06 15:37:12,068 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-08-06 15:37:12,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:12,069 INFO L225 Difference]: With dead ends: 179 [2021-08-06 15:37:12,069 INFO L226 Difference]: Without dead ends: 105 [2021-08-06 15:37:12,070 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 244.4ms TimeCoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2021-08-06 15:37:12,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-08-06 15:37:12,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 41. [2021-08-06 15:37:12,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.9) internal successors, (76), 40 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:12,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 76 transitions. [2021-08-06 15:37:12,073 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 76 transitions. Word has length 19 [2021-08-06 15:37:12,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:12,073 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 76 transitions. [2021-08-06 15:37:12,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:12,073 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 76 transitions. [2021-08-06 15:37:12,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-06 15:37:12,074 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:12,074 INFO L512 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:12,091 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:12,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-08-06 15:37:12,281 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:12,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:12,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1457905012, now seen corresponding path program 9 times [2021-08-06 15:37:12,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:12,282 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757580946] [2021-08-06 15:37:12,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:12,282 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:12,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:12,360 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:12,360 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:12,360 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757580946] [2021-08-06 15:37:12,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757580946] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:12,361 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967686400] [2021-08-06 15:37:12,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-06 15:37:12,361 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:12,361 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:12,362 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:12,399 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-08-06 15:37:12,478 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-08-06 15:37:12,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:12,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-06 15:37:12,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:12,608 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:12,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967686400] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:12,609 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:12,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-08-06 15:37:12,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073989967] [2021-08-06 15:37:12,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-06 15:37:12,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:12,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-06 15:37:12,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-08-06 15:37:12,610 INFO L87 Difference]: Start difference. First operand 41 states and 76 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:12,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:12,628 INFO L93 Difference]: Finished difference Result 160 states and 290 transitions. [2021-08-06 15:37:12,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-06 15:37:12,630 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-08-06 15:37:12,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:12,631 INFO L225 Difference]: With dead ends: 160 [2021-08-06 15:37:12,631 INFO L226 Difference]: Without dead ends: 147 [2021-08-06 15:37:12,631 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.6ms TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-08-06 15:37:12,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-08-06 15:37:12,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 111. [2021-08-06 15:37:12,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 2.090909090909091) internal successors, (230), 110 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:12,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 230 transitions. [2021-08-06 15:37:12,636 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 230 transitions. Word has length 20 [2021-08-06 15:37:12,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:12,636 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 230 transitions. [2021-08-06 15:37:12,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:12,637 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 230 transitions. [2021-08-06 15:37:12,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-08-06 15:37:12,637 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:12,637 INFO L512 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:12,660 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:12,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:12,860 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:12,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:12,860 INFO L82 PathProgramCache]: Analyzing trace with hash -1869472971, now seen corresponding path program 10 times [2021-08-06 15:37:12,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:12,860 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490365104] [2021-08-06 15:37:12,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:12,861 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:12,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:13,081 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:13,081 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:13,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490365104] [2021-08-06 15:37:13,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490365104] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:13,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547028760] [2021-08-06 15:37:13,081 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-06 15:37:13,081 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:13,082 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:13,082 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:13,085 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-08-06 15:37:13,179 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-06 15:37:13,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:13,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 27 conjunts are in the unsatisfiable core [2021-08-06 15:37:13,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:13,351 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 [2021-08-06 15:37:13,371 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:13,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547028760] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:13,371 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:13,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2021-08-06 15:37:13,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832932807] [2021-08-06 15:37:13,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-08-06 15:37:13,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:13,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-08-06 15:37:13,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-08-06 15:37:13,373 INFO L87 Difference]: Start difference. First operand 111 states and 230 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:13,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:13,667 INFO L93 Difference]: Finished difference Result 229 states and 435 transitions. [2021-08-06 15:37:13,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-08-06 15:37:13,667 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-08-06 15:37:13,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:13,668 INFO L225 Difference]: With dead ends: 229 [2021-08-06 15:37:13,668 INFO L226 Difference]: Without dead ends: 135 [2021-08-06 15:37:13,669 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 326.5ms TimeCoverageRelationStatistics Valid=135, Invalid=567, Unknown=0, NotChecked=0, Total=702 [2021-08-06 15:37:13,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-08-06 15:37:13,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 46. [2021-08-06 15:37:13,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.9111111111111112) internal successors, (86), 45 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:13,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 86 transitions. [2021-08-06 15:37:13,672 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 86 transitions. Word has length 21 [2021-08-06 15:37:13,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:13,672 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 86 transitions. [2021-08-06 15:37:13,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:13,672 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 86 transitions. [2021-08-06 15:37:13,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-06 15:37:13,673 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:13,673 INFO L512 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:13,697 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:13,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-08-06 15:37:13,887 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:13,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:13,887 INFO L82 PathProgramCache]: Analyzing trace with hash -2118361390, now seen corresponding path program 11 times [2021-08-06 15:37:13,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:13,887 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532261475] [2021-08-06 15:37:13,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:13,887 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:13,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:13,970 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:13,970 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:13,970 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532261475] [2021-08-06 15:37:13,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532261475] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:13,970 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891464539] [2021-08-06 15:37:13,970 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-06 15:37:13,970 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:13,970 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:13,971 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:13,972 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-08-06 15:37:14,080 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-08-06 15:37:14,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:14,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 14 conjunts are in the unsatisfiable core [2021-08-06 15:37:14,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:14,211 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:14,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1891464539] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:14,211 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:14,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-08-06 15:37:14,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831660121] [2021-08-06 15:37:14,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-06 15:37:14,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:14,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-06 15:37:14,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-08-06 15:37:14,215 INFO L87 Difference]: Start difference. First operand 46 states and 86 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:14,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:14,240 INFO L93 Difference]: Finished difference Result 195 states and 357 transitions. [2021-08-06 15:37:14,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-06 15:37:14,241 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-08-06 15:37:14,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:14,242 INFO L225 Difference]: With dead ends: 195 [2021-08-06 15:37:14,242 INFO L226 Difference]: Without dead ends: 180 [2021-08-06 15:37:14,243 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.2ms TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-08-06 15:37:14,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-08-06 15:37:14,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 138. [2021-08-06 15:37:14,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 2.0948905109489053) internal successors, (287), 137 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:14,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 287 transitions. [2021-08-06 15:37:14,252 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 287 transitions. Word has length 22 [2021-08-06 15:37:14,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:14,252 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 287 transitions. [2021-08-06 15:37:14,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:14,252 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 287 transitions. [2021-08-06 15:37:14,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-08-06 15:37:14,255 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:14,255 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:14,277 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:14,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-08-06 15:37:14,469 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:14,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:14,469 INFO L82 PathProgramCache]: Analyzing trace with hash 22032467, now seen corresponding path program 12 times [2021-08-06 15:37:14,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:14,470 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381047815] [2021-08-06 15:37:14,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:14,470 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:14,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:14,719 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:14,720 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:14,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381047815] [2021-08-06 15:37:14,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381047815] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:14,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627738990] [2021-08-06 15:37:14,720 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-06 15:37:14,720 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:14,720 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:14,721 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:14,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-08-06 15:37:14,852 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-08-06 15:37:14,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:14,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 31 conjunts are in the unsatisfiable core [2021-08-06 15:37:14,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:15,050 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 [2021-08-06 15:37:15,071 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:15,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627738990] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:15,072 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:15,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2021-08-06 15:37:15,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139387135] [2021-08-06 15:37:15,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-08-06 15:37:15,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:15,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-08-06 15:37:15,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2021-08-06 15:37:15,074 INFO L87 Difference]: Start difference. First operand 138 states and 287 transitions. Second operand has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:15,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:15,477 INFO L93 Difference]: Finished difference Result 285 states and 545 transitions. [2021-08-06 15:37:15,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-06 15:37:15,478 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-08-06 15:37:15,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:15,478 INFO L225 Difference]: With dead ends: 285 [2021-08-06 15:37:15,478 INFO L226 Difference]: Without dead ends: 169 [2021-08-06 15:37:15,479 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 427.5ms TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2021-08-06 15:37:15,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-08-06 15:37:15,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 51. [2021-08-06 15:37:15,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.92) internal successors, (96), 50 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:15,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 96 transitions. [2021-08-06 15:37:15,481 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 96 transitions. Word has length 23 [2021-08-06 15:37:15,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:15,482 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 96 transitions. [2021-08-06 15:37:15,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:15,482 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 96 transitions. [2021-08-06 15:37:15,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-06 15:37:15,482 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:15,482 INFO L512 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:15,508 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:15,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-08-06 15:37:15,708 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:15,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:15,709 INFO L82 PathProgramCache]: Analyzing trace with hash 683732340, now seen corresponding path program 13 times [2021-08-06 15:37:15,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:15,709 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25625838] [2021-08-06 15:37:15,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:15,709 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:15,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:15,809 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:15,809 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:15,810 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25625838] [2021-08-06 15:37:15,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25625838] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:15,810 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881637037] [2021-08-06 15:37:15,810 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-06 15:37:15,810 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:15,810 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:15,813 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:15,820 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-08-06 15:37:15,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:15,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 16 conjunts are in the unsatisfiable core [2021-08-06 15:37:15,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:16,153 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:16,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881637037] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:16,154 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:16,154 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2021-08-06 15:37:16,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379526783] [2021-08-06 15:37:16,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-06 15:37:16,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:16,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-06 15:37:16,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-08-06 15:37:16,155 INFO L87 Difference]: Start difference. First operand 51 states and 96 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:16,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:16,179 INFO L93 Difference]: Finished difference Result 233 states and 430 transitions. [2021-08-06 15:37:16,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-06 15:37:16,180 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-08-06 15:37:16,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:16,182 INFO L225 Difference]: With dead ends: 233 [2021-08-06 15:37:16,183 INFO L226 Difference]: Without dead ends: 216 [2021-08-06 15:37:16,184 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.2ms TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-08-06 15:37:16,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-08-06 15:37:16,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 168. [2021-08-06 15:37:16,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 2.095808383233533) internal successors, (350), 167 states have internal predecessors, (350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:16,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 350 transitions. [2021-08-06 15:37:16,189 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 350 transitions. Word has length 24 [2021-08-06 15:37:16,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:16,189 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 350 transitions. [2021-08-06 15:37:16,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:16,189 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 350 transitions. [2021-08-06 15:37:16,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-08-06 15:37:16,191 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:16,191 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:16,218 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:16,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-08-06 15:37:16,415 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:16,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:16,416 INFO L82 PathProgramCache]: Analyzing trace with hash 312894133, now seen corresponding path program 14 times [2021-08-06 15:37:16,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:16,416 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822353453] [2021-08-06 15:37:16,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:16,416 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:16,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:16,684 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:16,685 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:16,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822353453] [2021-08-06 15:37:16,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822353453] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:16,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054099522] [2021-08-06 15:37:16,685 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-06 15:37:16,685 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:16,685 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:16,693 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:16,693 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-08-06 15:37:16,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-06 15:37:16,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:16,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 35 conjunts are in the unsatisfiable core [2021-08-06 15:37:16,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:17,053 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 [2021-08-06 15:37:17,097 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:17,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054099522] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:17,098 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:17,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2021-08-06 15:37:17,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885497720] [2021-08-06 15:37:17,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-08-06 15:37:17,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:17,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-08-06 15:37:17,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2021-08-06 15:37:17,099 INFO L87 Difference]: Start difference. First operand 168 states and 350 transitions. Second operand has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:17,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:17,559 INFO L93 Difference]: Finished difference Result 347 states and 667 transitions. [2021-08-06 15:37:17,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-08-06 15:37:17,560 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-08-06 15:37:17,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:17,561 INFO L225 Difference]: With dead ends: 347 [2021-08-06 15:37:17,561 INFO L226 Difference]: Without dead ends: 207 [2021-08-06 15:37:17,562 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 502.8ms TimeCoverageRelationStatistics Valid=211, Invalid=979, Unknown=0, NotChecked=0, Total=1190 [2021-08-06 15:37:17,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-08-06 15:37:17,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 56. [2021-08-06 15:37:17,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.9272727272727272) internal successors, (106), 55 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:17,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 106 transitions. [2021-08-06 15:37:17,566 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 106 transitions. Word has length 25 [2021-08-06 15:37:17,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:17,566 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 106 transitions. [2021-08-06 15:37:17,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:17,566 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 106 transitions. [2021-08-06 15:37:17,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-08-06 15:37:17,567 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:17,567 INFO L512 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:17,592 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:17,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:17,790 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:17,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:17,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1110509394, now seen corresponding path program 15 times [2021-08-06 15:37:17,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:17,790 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391513559] [2021-08-06 15:37:17,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:17,790 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:17,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:17,895 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:17,895 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:17,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391513559] [2021-08-06 15:37:17,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391513559] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:17,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041818113] [2021-08-06 15:37:17,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-06 15:37:17,895 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:17,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:17,896 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:17,900 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-08-06 15:37:18,070 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-08-06 15:37:18,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:18,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 18 conjunts are in the unsatisfiable core [2021-08-06 15:37:18,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:18,263 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:18,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041818113] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:18,263 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:18,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2021-08-06 15:37:18,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929013509] [2021-08-06 15:37:18,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-08-06 15:37:18,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:18,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-08-06 15:37:18,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-08-06 15:37:18,264 INFO L87 Difference]: Start difference. First operand 56 states and 106 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:18,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:18,295 INFO L93 Difference]: Finished difference Result 274 states and 509 transitions. [2021-08-06 15:37:18,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-06 15:37:18,296 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-08-06 15:37:18,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:18,297 INFO L225 Difference]: With dead ends: 274 [2021-08-06 15:37:18,297 INFO L226 Difference]: Without dead ends: 255 [2021-08-06 15:37:18,297 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.3ms TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-08-06 15:37:18,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-08-06 15:37:18,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 201. [2021-08-06 15:37:18,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 2.095) internal successors, (419), 200 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:18,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 419 transitions. [2021-08-06 15:37:18,303 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 419 transitions. Word has length 26 [2021-08-06 15:37:18,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:18,303 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 419 transitions. [2021-08-06 15:37:18,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:18,303 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 419 transitions. [2021-08-06 15:37:18,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-08-06 15:37:18,304 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:18,304 INFO L512 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:18,322 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:18,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-08-06 15:37:18,505 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:18,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:18,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1217278035, now seen corresponding path program 16 times [2021-08-06 15:37:18,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:18,505 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491774115] [2021-08-06 15:37:18,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:18,505 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:18,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:18,819 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:18,819 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:18,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491774115] [2021-08-06 15:37:18,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491774115] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:18,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96185798] [2021-08-06 15:37:18,819 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-06 15:37:18,819 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:18,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:18,820 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:18,821 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-08-06 15:37:18,990 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-06 15:37:18,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:18,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 39 conjunts are in the unsatisfiable core [2021-08-06 15:37:18,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:19,237 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 [2021-08-06 15:37:19,255 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:19,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96185798] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:19,255 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:19,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2021-08-06 15:37:19,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527770707] [2021-08-06 15:37:19,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-08-06 15:37:19,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:19,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-08-06 15:37:19,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2021-08-06 15:37:19,260 INFO L87 Difference]: Start difference. First operand 201 states and 419 transitions. Second operand has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:19,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:19,877 INFO L93 Difference]: Finished difference Result 415 states and 801 transitions. [2021-08-06 15:37:19,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-08-06 15:37:19,877 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-08-06 15:37:19,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:19,878 INFO L225 Difference]: With dead ends: 415 [2021-08-06 15:37:19,878 INFO L226 Difference]: Without dead ends: 249 [2021-08-06 15:37:19,879 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 633.3ms TimeCoverageRelationStatistics Valid=255, Invalid=1227, Unknown=0, NotChecked=0, Total=1482 [2021-08-06 15:37:19,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-08-06 15:37:19,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 61. [2021-08-06 15:37:19,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.9333333333333333) internal successors, (116), 60 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:19,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 116 transitions. [2021-08-06 15:37:19,882 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 116 transitions. Word has length 27 [2021-08-06 15:37:19,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:19,882 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 116 transitions. [2021-08-06 15:37:19,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:19,882 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 116 transitions. [2021-08-06 15:37:19,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-08-06 15:37:19,883 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:19,883 INFO L512 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:19,908 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:20,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-08-06 15:37:20,097 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:20,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:20,097 INFO L82 PathProgramCache]: Analyzing trace with hash -918360716, now seen corresponding path program 17 times [2021-08-06 15:37:20,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:20,097 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106532064] [2021-08-06 15:37:20,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:20,098 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:20,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:20,229 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:20,229 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:20,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106532064] [2021-08-06 15:37:20,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106532064] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:20,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317176860] [2021-08-06 15:37:20,229 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-06 15:37:20,229 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:20,229 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:20,230 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:20,231 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-08-06 15:37:20,416 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-08-06 15:37:20,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:20,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 20 conjunts are in the unsatisfiable core [2021-08-06 15:37:20,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:37:20,584 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:20,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317176860] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:20,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:37:20,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-08-06 15:37:20,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306819100] [2021-08-06 15:37:20,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-06 15:37:20,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:37:20,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-06 15:37:20,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-08-06 15:37:20,586 INFO L87 Difference]: Start difference. First operand 61 states and 116 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:20,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-06 15:37:20,619 INFO L93 Difference]: Finished difference Result 318 states and 594 transitions. [2021-08-06 15:37:20,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-06 15:37:20,625 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-08-06 15:37:20,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-06 15:37:20,628 INFO L225 Difference]: With dead ends: 318 [2021-08-06 15:37:20,628 INFO L226 Difference]: Without dead ends: 297 [2021-08-06 15:37:20,629 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.6ms TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-08-06 15:37:20,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-08-06 15:37:20,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 237. [2021-08-06 15:37:20,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 2.093220338983051) internal successors, (494), 236 states have internal predecessors, (494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:20,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 494 transitions. [2021-08-06 15:37:20,634 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 494 transitions. Word has length 28 [2021-08-06 15:37:20,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-06 15:37:20,635 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 494 transitions. [2021-08-06 15:37:20,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:37:20,635 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 494 transitions. [2021-08-06 15:37:20,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-08-06 15:37:20,635 INFO L504 BasicCegarLoop]: Found error trace [2021-08-06 15:37:20,636 INFO L512 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-06 15:37:20,656 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-08-06 15:37:20,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:20,852 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-08-06 15:37:20,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-06 15:37:20,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1392911819, now seen corresponding path program 18 times [2021-08-06 15:37:20,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-06 15:37:20,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441203457] [2021-08-06 15:37:20,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-06 15:37:20,853 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-06 15:37:20,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-06 15:37:21,205 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:37:21,205 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-06 15:37:21,205 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441203457] [2021-08-06 15:37:21,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1441203457] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:37:21,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686386478] [2021-08-06 15:37:21,206 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-06 15:37:21,206 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:37:21,206 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-06 15:37:21,208 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-06 15:37:21,208 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-08-06 15:37:21,410 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-08-06 15:37:21,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-06 15:37:21,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 44 conjunts are in the unsatisfiable core [2021-08-06 15:37:21,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-06 15:38:04,593 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-08-06 15:38:04,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 16 [2021-08-06 15:38:04,611 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 2 proven. 65 refuted. 43 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-06 15:38:04,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686386478] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-06 15:38:04,612 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-06 15:38:04,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 42 [2021-08-06 15:38:04,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653034562] [2021-08-06 15:38:04,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-08-06 15:38:04,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-06 15:38:04,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-08-06 15:38:04,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1533, Unknown=43, NotChecked=0, Total=1806 [2021-08-06 15:38:04,613 INFO L87 Difference]: Start difference. First operand 237 states and 494 transitions. Second operand has 43 states, 43 states have (on average 1.255813953488372) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-06 15:38:34,687 WARN L207 SmtUtils]: Spent 7.62 s on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2021-08-06 15:38:57,920 WARN L207 SmtUtils]: Spent 9.51 s on a formula simplification. DAG size of input: 81 DAG size of output: 48 [2021-08-06 15:39:25,087 WARN L207 SmtUtils]: Spent 6.16 s on a formula simplification. DAG size of input: 59 DAG size of output: 44 [2021-08-06 15:39:39,521 WARN L207 SmtUtils]: Spent 6.72 s on a formula simplification. DAG size of input: 72 DAG size of output: 38 [2021-08-06 15:40:32,311 WARN L207 SmtUtils]: Spent 13.20 s on a formula simplification. DAG size of input: 63 DAG size of output: 47 [2021-08-06 15:40:55,251 WARN L207 SmtUtils]: Spent 20.38 s on a formula simplification. DAG size of input: 79 DAG size of output: 54 [2021-08-06 15:41:43,902 WARN L207 SmtUtils]: Spent 6.85 s on a formula simplification that was a NOOP. DAG size: 56 [2021-08-06 15:42:11,635 WARN L207 SmtUtils]: Spent 12.14 s on a formula simplification. DAG size of input: 70 DAG size of output: 52 [2021-08-06 15:43:31,923 WARN L207 SmtUtils]: Spent 6.28 s on a formula simplification. DAG size of input: 55 DAG size of output: 46 [2021-08-06 15:43:56,002 WARN L207 SmtUtils]: Spent 14.94 s on a formula simplification. DAG size of input: 61 DAG size of output: 54 [2021-08-06 15:44:13,792 WARN L207 SmtUtils]: Spent 12.67 s on a formula simplification that was a NOOP. DAG size: 77 [2021-08-06 15:46:23,731 WARN L207 SmtUtils]: Spent 6.96 s on a formula simplification that was a NOOP. DAG size: 61 [2021-08-06 15:46:45,685 WARN L207 SmtUtils]: Spent 10.62 s on a formula simplification that was a NOOP. DAG size: 68 [2021-08-06 15:48:56,082 WARN L207 SmtUtils]: Spent 6.63 s on a formula simplification that was a NOOP. DAG size: 53 [2021-08-06 15:49:23,419 WARN L207 SmtUtils]: Spent 8.91 s on a formula simplification that was a NOOP. DAG size: 59 Received shutdown request... [2021-08-06 15:51:25,639 WARN L340 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Timeout while monitored process is still running, waiting 1000 ms for graceful end [2021-08-06 15:51:25,639 WARN L340 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Timeout while monitored process is still running, waiting 1000 ms for graceful end [2021-08-06 15:51:26,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-08-06 15:51:26,049 INFO L764 garLoopResultBuilder]: Registering result TIMEOUT for location ULTIMATE.startErr0ASSERT_VIOLATIONASSERT [2021-08-06 15:51:26,066 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-08-06 15:51:26,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-06 15:51:26,250 WARN L594 AbstractCegarLoop]: Verification canceled: while BasicCegarLoop was constructing difference of abstraction (237states) and FLOYD_HOARE automaton (currently 99 states, 43 states before enhancement),while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 139 known predicates. [2021-08-06 15:51:26,252 INFO L764 garLoopResultBuilder]: Registering result TIMEOUT for location ULTIMATE.startErr0INUSE_VIOLATION [2021-08-06 15:51:26,252 INFO L764 garLoopResultBuilder]: Registering result TIMEOUT for location ULTIMATE.startErr1INUSE_VIOLATION [2021-08-06 15:51:26,256 INFO L229 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2021-08-06 15:51:26,256 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-06 15:51:26,257 INFO L202 PluginConnector]: Adding new model context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.08 03:51:26 BasicIcfg [2021-08-06 15:51:26,257 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-06 15:51:26,258 INFO L168 Benchmark]: Toolchain (without parser) took 886667.99 ms. Allocated memory was 177.2 MB in the beginning and 217.1 MB in the end (delta: 39.8 MB). Free memory was 157.9 MB in the beginning and 122.4 MB in the end (delta: 35.5 MB). Peak memory consumption was 77.0 MB. Max. memory is 8.0 GB. [2021-08-06 15:51:26,258 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.14 ms. Allocated memory is still 177.2 MB. Free memory is still 159.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-08-06 15:51:26,258 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.52 ms. Allocated memory is still 177.2 MB. Free memory was 157.9 MB in the beginning and 156.5 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-08-06 15:51:26,258 INFO L168 Benchmark]: Boogie Preprocessor took 10.82 ms. Allocated memory is still 177.2 MB. Free memory was 156.5 MB in the beginning and 155.4 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-08-06 15:51:26,258 INFO L168 Benchmark]: RCFGBuilder took 273.10 ms. Allocated memory is still 177.2 MB. Free memory was 155.4 MB in the beginning and 143.6 MB in the end (delta: 11.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-08-06 15:51:26,258 INFO L168 Benchmark]: TraceAbstraction took 886357.68 ms. Allocated memory was 177.2 MB in the beginning and 217.1 MB in the end (delta: 39.8 MB). Free memory was 143.3 MB in the beginning and 122.4 MB in the end (delta: 20.8 MB). Peak memory consumption was 61.3 MB. Max. memory is 8.0 GB. [2021-08-06 15:51:26,259 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.14 ms. Allocated memory is still 177.2 MB. Free memory is still 159.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 22.52 ms. Allocated memory is still 177.2 MB. Free memory was 157.9 MB in the beginning and 156.5 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 10.82 ms. Allocated memory is still 177.2 MB. Free memory was 156.5 MB in the beginning and 155.4 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 273.10 ms. Allocated memory is still 177.2 MB. Free memory was 155.4 MB in the beginning and 143.6 MB in the end (delta: 11.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 886357.68 ms. Allocated memory was 177.2 MB in the beginning and 217.1 MB in the end (delta: 39.8 MB). Free memory was 143.3 MB in the beginning and 122.4 MB in the end (delta: 20.8 MB). Peak memory consumption was 61.3 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - TimeoutResultAtElement [Line: 47]: Timeout (TraceAbstraction) Unable to prove that assertion always holds Cancelled while BasicCegarLoop was constructing difference of abstraction (237states) and FLOYD_HOARE automaton (currently 99 states, 43 states before enhancement),while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 139 known predicates. - TimeoutResultAtElement [Line: 42]: Timeout (TraceAbstraction) Unable to prove that petrification did provide enough thread instances (tool internal message, not intended for end users) Cancelled while BasicCegarLoop was constructing difference of abstraction (237states) and FLOYD_HOARE automaton (currently 99 states, 43 states before enhancement),while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 139 known predicates. - TimeoutResultAtElement [Line: 42]: Timeout (TraceAbstraction) Unable to prove that petrification did provide enough thread instances (tool internal message, not intended for end users) Cancelled while BasicCegarLoop was constructing difference of abstraction (237states) and FLOYD_HOARE automaton (currently 99 states, 43 states before enhancement),while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 139 known predicates. - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: ULTIMATE.start with 1 thread instances CFG has 5 procedures, 20 locations, 3 error locations. Started 1 CEGAR loops. OverallTime: 886285.8ms, OverallIterations: 20, TraceHistogramMax: 10, EmptinessCheckTime: 21.1ms, AutomataDifference: 826716.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 16.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 659 SDtfs, 2987 SDslu, 5121 SDs, 0 SdLazy, 1542 SolverSat, 856 SolverUnsat, 42 SolverUnknown, 0 SolverNotchecked, 20246.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 785 GetRequests, 370 SyntacticMatches, 18 SemanticMatches, 396 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6547 ImplicationChecksByTransitivity, 831374.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=237occurred in iteration=19, InterpolantAutomatonStates: 202, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 134.5ms AutomataMinimizationTime, 19 MinimizatonAttempts, 1024 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 100.3ms SsaConstructionTime, 368.9ms SatisfiabilityAnalysisTime, 53096.7ms InterpolantComputationTime, 747 NumberOfCodeBlocks, 747 NumberOfCodeBlocksAsserted, 72 NumberOfCheckSat, 709 ConstructedInterpolants, 19 QuantifiedInterpolants, 3222 SizeOfPredicates, 10 NumberOfNonLiveVariables, 1519 ConjunctsInSsa, 352 ConjunctsInUnsatCore, 38 InterpolantComputations, 2 PerfectInterpolantSequences, 422/1617 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown