/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 18:15:12,855 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 18:15:12,856 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 18:15:12,892 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 18:15:12,903 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 18:15:12,905 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 18:15:12,905 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 18:15:12,907 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 18:15:12,908 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 18:15:12,908 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 18:15:12,910 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 18:15:12,913 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 18:15:12,915 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 18:15:12,915 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 18:15:12,916 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 18:15:12,916 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 18:15:12,917 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 18:15:12,921 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-04-06 18:15:12,926 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 18:15:12,926 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 18:15:12,927 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 18:15:12,928 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-04-06 18:15:12,936 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 18:15:12,936 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 18:15:12,937 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 18:15:12,937 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 18:15:12,937 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 18:15:12,937 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 18:15:12,937 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 18:15:12,937 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 18:15:12,937 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 18:15:12,938 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 18:15:12,938 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 18:15:12,938 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 18:15:12,938 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 18:15:12,938 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 18:15:12,938 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 18:15:12,939 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 18:15:12,939 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 18:15:13,113 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 18:15:13,129 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 18:15:13,130 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 18:15:13,131 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 18:15:13,131 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 18:15:13,132 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound50.c [2022-04-06 18:15:13,170 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11cb5fba6/50c522153d9a41ffa24db9aae616c7bd/FLAGadd866340 [2022-04-06 18:15:13,573 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 18:15:13,573 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound50.c [2022-04-06 18:15:13,577 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11cb5fba6/50c522153d9a41ffa24db9aae616c7bd/FLAGadd866340 [2022-04-06 18:15:13,586 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11cb5fba6/50c522153d9a41ffa24db9aae616c7bd [2022-04-06 18:15:13,588 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 18:15:13,589 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 18:15:13,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 18:15:13,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 18:15:13,592 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 18:15:13,593 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,593 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@230e00f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13, skipping insertion in model container [2022-04-06 18:15:13,593 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,598 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 18:15:13,606 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 18:15:13,747 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound50.c[537,550] [2022-04-06 18:15:13,756 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 18:15:13,760 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 18:15:13,771 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound50.c[537,550] [2022-04-06 18:15:13,785 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 18:15:13,794 INFO L208 MainTranslator]: Completed translation [2022-04-06 18:15:13,794 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13 WrapperNode [2022-04-06 18:15:13,795 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 18:15:13,797 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 18:15:13,797 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 18:15:13,797 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 18:15:13,806 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,812 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,812 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,815 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,817 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,818 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,819 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 18:15:13,820 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 18:15:13,820 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 18:15:13,820 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 18:15:13,820 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (1/1) ... [2022-04-06 18:15:13,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 18:15:13,832 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:15:13,845 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) [2022-04-06 18:15:13,861 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 [2022-04-06 18:15:13,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 18:15:13,871 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 18:15:13,871 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 18:15:13,871 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 18:15:13,871 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 18:15:13,871 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 18:15:13,871 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 18:15:13,871 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 18:15:13,871 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 18:15:13,871 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 18:15:13,871 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-04-06 18:15:13,871 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 18:15:13,872 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 18:15:13,872 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 18:15:13,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 18:15:13,872 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 18:15:13,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 18:15:13,872 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 18:15:13,872 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 18:15:13,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 18:15:13,912 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 18:15:13,913 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 18:15:14,006 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 18:15:14,011 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 18:15:14,011 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-04-06 18:15:14,012 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 06:15:14 BoogieIcfgContainer [2022-04-06 18:15:14,012 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 18:15:14,013 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 18:15:14,014 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 18:15:14,016 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 18:15:14,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 06:15:13" (1/3) ... [2022-04-06 18:15:14,016 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cfdcf6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 06:15:14, skipping insertion in model container [2022-04-06 18:15:14,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 06:15:13" (2/3) ... [2022-04-06 18:15:14,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cfdcf6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 06:15:14, skipping insertion in model container [2022-04-06 18:15:14,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 06:15:14" (3/3) ... [2022-04-06 18:15:14,018 INFO L111 eAbstractionObserver]: Analyzing ICFG prodbin-ll_valuebound50.c [2022-04-06 18:15:14,021 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 18:15:14,021 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 18:15:14,061 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 18:15:14,065 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2022-04-06 18:15:14,066 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 18:15:14,075 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 18:15:14,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-06 18:15:14,080 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:15:14,081 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:15:14,081 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:15:14,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:15:14,084 INFO L85 PathProgramCache]: Analyzing trace with hash -589322634, now seen corresponding path program 1 times [2022-04-06 18:15:14,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:14,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [500622774] [2022-04-06 18:15:14,111 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:15:14,111 INFO L85 PathProgramCache]: Analyzing trace with hash -589322634, now seen corresponding path program 2 times [2022-04-06 18:15:14,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:15:14,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978763992] [2022-04-06 18:15:14,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:15:14,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:15:14,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 18:15:14,263 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 18:15:14,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 18:15:14,281 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 18:15:14,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 18:15:14,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-04-06 18:15:14,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 18:15:14,304 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 18:15:14,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 18:15:14,316 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 18:15:14,316 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:15:14,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978763992] [2022-04-06 18:15:14,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978763992] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:14,317 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:14,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 18:15:14,319 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:15:14,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [500622774] [2022-04-06 18:15:14,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [500622774] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:14,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:14,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 18:15:14,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669899707] [2022-04-06 18:15:14,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:15:14,323 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 18:15:14,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:14,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 18:15:14,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 18:15:14,351 INFO L87 Difference]: Start difference. First operand has 32 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 18:15:14,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:15:14,426 INFO L93 Difference]: Finished difference Result 57 states and 77 transitions. [2022-04-06 18:15:14,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 18:15:14,429 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2022-04-06 18:15:14,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:15:14,440 INFO L225 Difference]: With dead ends: 57 [2022-04-06 18:15:14,440 INFO L226 Difference]: Without dead ends: 27 [2022-04-06 18:15:14,442 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 18:15:14,444 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 19 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 18:15:14,445 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 34 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 18:15:14,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-04-06 18:15:14,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-04-06 18:15:14,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 18:15:14,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2022-04-06 18:15:14,475 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 28 [2022-04-06 18:15:14,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:15:14,476 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2022-04-06 18:15:14,476 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 18:15:14,476 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2022-04-06 18:15:14,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-06 18:15:14,477 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:15:14,477 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:15:14,478 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 18:15:14,478 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:15:14,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:15:14,478 INFO L85 PathProgramCache]: Analyzing trace with hash -1736242504, now seen corresponding path program 1 times [2022-04-06 18:15:14,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:14,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [393886245] [2022-04-06 18:15:14,479 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:15:14,479 INFO L85 PathProgramCache]: Analyzing trace with hash -1736242504, now seen corresponding path program 2 times [2022-04-06 18:15:14,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:15:14,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198465840] [2022-04-06 18:15:14,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:15:14,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:15:14,509 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:15:14,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [463743803] [2022-04-06 18:15:14,510 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 18:15:14,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:14,510 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:15:14,516 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) [2022-04-06 18:15:14,555 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 18:15:14,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-04-06 18:15:14,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:15:14,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 18:15:14,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:15:14,689 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 18:15:14,690 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 18:15:14,690 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:15:14,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198465840] [2022-04-06 18:15:14,690 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:15:14,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463743803] [2022-04-06 18:15:14,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463743803] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:14,691 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:14,691 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 18:15:14,692 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:15:14,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [393886245] [2022-04-06 18:15:14,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [393886245] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:14,692 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:14,693 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 18:15:14,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744609413] [2022-04-06 18:15:14,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:15:14,693 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 18:15:14,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:14,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 18:15:14,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 18:15:14,694 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-04-06 18:15:14,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:15:14,747 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2022-04-06 18:15:14,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 18:15:14,748 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2022-04-06 18:15:14,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:15:14,748 INFO L225 Difference]: With dead ends: 39 [2022-04-06 18:15:14,749 INFO L226 Difference]: Without dead ends: 37 [2022-04-06 18:15:14,749 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 18:15:14,750 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 8 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 18:15:14,750 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 87 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 18:15:14,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-04-06 18:15:14,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2022-04-06 18:15:14,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 20 states have (on average 1.15) internal successors, (23), 22 states have internal predecessors, (23), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 18:15:14,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2022-04-06 18:15:14,758 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 28 [2022-04-06 18:15:14,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:15:14,759 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2022-04-06 18:15:14,759 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-04-06 18:15:14,759 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2022-04-06 18:15:14,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-04-06 18:15:14,760 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:15:14,760 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:15:14,777 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 18:15:14,977 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:14,977 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:15:14,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:15:14,990 INFO L85 PathProgramCache]: Analyzing trace with hash 1911690432, now seen corresponding path program 1 times [2022-04-06 18:15:14,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:14,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1180644198] [2022-04-06 18:15:14,992 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:15:14,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1911690432, now seen corresponding path program 2 times [2022-04-06 18:15:14,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:15:14,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713451681] [2022-04-06 18:15:14,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:15:14,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:15:15,033 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:15:15,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [349401045] [2022-04-06 18:15:15,034 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 18:15:15,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:15,034 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:15:15,044 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) [2022-04-06 18:15:15,046 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 18:15:15,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 18:15:15,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:15:15,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 18:15:15,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:15:15,181 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 18:15:15,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 18:15:15,182 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:15:15,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713451681] [2022-04-06 18:15:15,182 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:15:15,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349401045] [2022-04-06 18:15:15,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349401045] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:15,182 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:15,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 18:15:15,183 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:15:15,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1180644198] [2022-04-06 18:15:15,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1180644198] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:15,183 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:15,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 18:15:15,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536957623] [2022-04-06 18:15:15,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:15:15,184 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 18:15:15,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:15,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 18:15:15,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 18:15:15,185 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 18:15:15,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:15:15,253 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2022-04-06 18:15:15,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 18:15:15,254 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2022-04-06 18:15:15,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:15:15,254 INFO L225 Difference]: With dead ends: 43 [2022-04-06 18:15:15,255 INFO L226 Difference]: Without dead ends: 36 [2022-04-06 18:15:15,255 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-06 18:15:15,256 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 14 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 18:15:15,256 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 89 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 18:15:15,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-04-06 18:15:15,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2022-04-06 18:15:15,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 18:15:15,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2022-04-06 18:15:15,262 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 34 [2022-04-06 18:15:15,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:15:15,263 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2022-04-06 18:15:15,263 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 18:15:15,263 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2022-04-06 18:15:15,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-04-06 18:15:15,264 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:15:15,272 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:15:15,289 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 18:15:15,474 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-04-06 18:15:15,475 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:15:15,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:15:15,475 INFO L85 PathProgramCache]: Analyzing trace with hash 2022075506, now seen corresponding path program 1 times [2022-04-06 18:15:15,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:15,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [923815728] [2022-04-06 18:15:15,476 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:15:15,476 INFO L85 PathProgramCache]: Analyzing trace with hash 2022075506, now seen corresponding path program 2 times [2022-04-06 18:15:15,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:15:15,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361535838] [2022-04-06 18:15:15,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:15:15,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:15:15,493 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:15:15,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [975470656] [2022-04-06 18:15:15,493 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 18:15:15,493 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:15,494 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:15:15,494 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) [2022-04-06 18:15:15,521 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 18:15:15,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 18:15:15,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:15:15,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 26 conjunts are in the unsatisfiable core [2022-04-06 18:15:15,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:15:18,266 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 18:15:18,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:15:31,084 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 18:15:31,085 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:15:31,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361535838] [2022-04-06 18:15:31,087 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:15:31,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975470656] [2022-04-06 18:15:31,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975470656] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:15:31,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:15:31,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2022-04-06 18:15:31,093 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:15:31,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [923815728] [2022-04-06 18:15:31,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [923815728] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:31,110 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:31,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 18:15:31,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225011206] [2022-04-06 18:15:31,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:15:31,111 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 18:15:31,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:31,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 18:15:31,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-04-06 18:15:31,112 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 18:15:33,711 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:15:33,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:15:33,725 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2022-04-06 18:15:33,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 18:15:33,727 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 37 [2022-04-06 18:15:33,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:15:33,728 INFO L225 Difference]: With dead ends: 49 [2022-04-06 18:15:33,728 INFO L226 Difference]: Without dead ends: 47 [2022-04-06 18:15:33,728 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2022-04-06 18:15:33,729 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 18 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-04-06 18:15:33,729 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 163 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-04-06 18:15:33,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-04-06 18:15:33,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 42. [2022-04-06 18:15:33,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 29 states have internal predecessors, (31), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 18:15:33,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2022-04-06 18:15:33,754 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 37 [2022-04-06 18:15:33,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:15:33,754 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2022-04-06 18:15:33,754 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 18:15:33,754 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2022-04-06 18:15:33,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-04-06 18:15:33,755 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:15:33,755 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:15:33,851 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-04-06 18:15:33,955 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:33,956 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:15:33,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:15:33,956 INFO L85 PathProgramCache]: Analyzing trace with hash -497884428, now seen corresponding path program 1 times [2022-04-06 18:15:33,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:33,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [60704823] [2022-04-06 18:15:33,957 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:15:33,957 INFO L85 PathProgramCache]: Analyzing trace with hash -497884428, now seen corresponding path program 2 times [2022-04-06 18:15:33,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:15:33,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054240092] [2022-04-06 18:15:33,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:15:33,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:15:33,966 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:15:33,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [840517895] [2022-04-06 18:15:33,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 18:15:33,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:33,967 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:15:33,980 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) [2022-04-06 18:15:33,999 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 18:15:34,053 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 18:15:34,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:15:34,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 23 conjunts are in the unsatisfiable core [2022-04-06 18:15:34,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:15:35,702 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 18:15:35,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:15:36,444 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 18:15:36,444 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:15:36,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054240092] [2022-04-06 18:15:36,445 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:15:36,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840517895] [2022-04-06 18:15:36,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840517895] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:15:36,445 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:15:36,445 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2022-04-06 18:15:36,445 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:15:36,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [60704823] [2022-04-06 18:15:36,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [60704823] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:36,445 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:36,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 18:15:36,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903612494] [2022-04-06 18:15:36,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:15:36,446 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 18:15:36,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:36,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 18:15:36,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2022-04-06 18:15:36,447 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 18:15:36,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:15:36,627 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2022-04-06 18:15:36,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 18:15:36,628 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 37 [2022-04-06 18:15:36,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:15:36,632 INFO L225 Difference]: With dead ends: 59 [2022-04-06 18:15:36,632 INFO L226 Difference]: Without dead ends: 52 [2022-04-06 18:15:36,633 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2022-04-06 18:15:36,635 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 19 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 18:15:36,635 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 128 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 18:15:36,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-04-06 18:15:36,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2022-04-06 18:15:36,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-06 18:15:36,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-04-06 18:15:36,650 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 37 [2022-04-06 18:15:36,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:15:36,651 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-04-06 18:15:36,652 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 18:15:36,652 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-04-06 18:15:36,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-04-06 18:15:36,654 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:15:36,654 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:15:36,682 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 18:15:36,870 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:36,871 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:15:36,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:15:36,871 INFO L85 PathProgramCache]: Analyzing trace with hash -1351630086, now seen corresponding path program 1 times [2022-04-06 18:15:36,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:36,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1543122956] [2022-04-06 18:15:36,872 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:15:36,872 INFO L85 PathProgramCache]: Analyzing trace with hash -1351630086, now seen corresponding path program 2 times [2022-04-06 18:15:36,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:15:36,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409743898] [2022-04-06 18:15:36,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:15:36,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:15:36,884 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:15:36,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [59689535] [2022-04-06 18:15:36,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 18:15:36,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:36,885 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:15:36,904 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) [2022-04-06 18:15:36,958 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 18:15:36,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 18:15:36,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:15:36,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 10 conjunts are in the unsatisfiable core [2022-04-06 18:15:36,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:15:37,108 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 18:15:37,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:15:37,272 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 18:15:37,273 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:15:37,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409743898] [2022-04-06 18:15:37,273 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:15:37,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59689535] [2022-04-06 18:15:37,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59689535] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:15:37,273 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:15:37,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2022-04-06 18:15:37,274 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:15:37,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1543122956] [2022-04-06 18:15:37,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1543122956] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:15:37,274 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:15:37,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 18:15:37,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420527062] [2022-04-06 18:15:37,274 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:15:37,275 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 18:15:37,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:37,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 18:15:37,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-04-06 18:15:37,276 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-04-06 18:15:39,299 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:15:39,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:15:39,427 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2022-04-06 18:15:39,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 18:15:39,427 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 43 [2022-04-06 18:15:39,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:15:39,428 INFO L225 Difference]: With dead ends: 57 [2022-04-06 18:15:39,428 INFO L226 Difference]: Without dead ends: 50 [2022-04-06 18:15:39,429 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-04-06 18:15:39,429 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 13 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-04-06 18:15:39,429 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 120 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 69 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2022-04-06 18:15:39,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-04-06 18:15:39,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2022-04-06 18:15:39,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 28 states have internal predecessors, (30), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 18:15:39,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-04-06 18:15:39,436 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 43 [2022-04-06 18:15:39,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:15:39,436 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-04-06 18:15:39,436 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-04-06 18:15:39,436 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-04-06 18:15:39,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-04-06 18:15:39,440 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:15:39,440 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:15:39,459 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 18:15:39,657 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:39,657 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:15:39,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:15:39,657 INFO L85 PathProgramCache]: Analyzing trace with hash 1025268728, now seen corresponding path program 3 times [2022-04-06 18:15:39,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:15:39,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [247595066] [2022-04-06 18:15:39,658 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:15:39,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1025268728, now seen corresponding path program 4 times [2022-04-06 18:15:39,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:15:39,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450936649] [2022-04-06 18:15:39,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:15:39,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:15:39,667 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:15:39,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1638540626] [2022-04-06 18:15:39,668 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 18:15:39,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:15:39,668 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:15:39,673 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) [2022-04-06 18:15:39,674 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 18:15:39,711 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 18:15:39,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:15:39,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 39 conjunts are in the unsatisfiable core [2022-04-06 18:15:39,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:15:49,743 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 18:15:49,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:16:02,124 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 18:16:02,125 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:16:02,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450936649] [2022-04-06 18:16:02,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:16:02,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638540626] [2022-04-06 18:16:02,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638540626] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:16:02,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:16:02,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 17 [2022-04-06 18:16:02,125 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:16:02,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [247595066] [2022-04-06 18:16:02,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [247595066] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:16:02,126 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:16:02,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 18:16:02,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574448690] [2022-04-06 18:16:02,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:16:02,126 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 18:16:02,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:16:02,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 18:16:02,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=218, Unknown=1, NotChecked=0, Total=272 [2022-04-06 18:16:02,127 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-04-06 18:16:04,175 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:16:04,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:16:04,241 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2022-04-06 18:16:04,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 18:16:04,242 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 46 [2022-04-06 18:16:04,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:16:04,243 INFO L225 Difference]: With dead ends: 63 [2022-04-06 18:16:04,243 INFO L226 Difference]: Without dead ends: 61 [2022-04-06 18:16:04,243 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=66, Invalid=275, Unknown=1, NotChecked=0, Total=342 [2022-04-06 18:16:04,244 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 19 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-04-06 18:16:04,244 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 189 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-04-06 18:16:04,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-04-06 18:16:04,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 50. [2022-04-06 18:16:04,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-06 18:16:04,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-04-06 18:16:04,258 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 46 [2022-04-06 18:16:04,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:16:04,260 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-04-06 18:16:04,260 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-04-06 18:16:04,260 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-04-06 18:16:04,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-04-06 18:16:04,261 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:16:04,261 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:16:04,297 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 18:16:04,474 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:16:04,475 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:16:04,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:16:04,476 INFO L85 PathProgramCache]: Analyzing trace with hash -1494691206, now seen corresponding path program 1 times [2022-04-06 18:16:04,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:16:04,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1541577837] [2022-04-06 18:16:04,476 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:16:04,476 INFO L85 PathProgramCache]: Analyzing trace with hash -1494691206, now seen corresponding path program 2 times [2022-04-06 18:16:04,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:16:04,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843551276] [2022-04-06 18:16:04,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:16:04,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:16:04,484 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:16:04,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [900406049] [2022-04-06 18:16:04,485 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 18:16:04,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:16:04,485 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:16:04,493 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) [2022-04-06 18:16:04,498 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 18:16:04,556 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 18:16:04,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:16:04,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 21 conjunts are in the unsatisfiable core [2022-04-06 18:16:04,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:16:16,701 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-04-06 18:16:16,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:16:19,866 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-04-06 18:16:19,866 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:16:19,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843551276] [2022-04-06 18:16:19,867 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:16:19,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900406049] [2022-04-06 18:16:19,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900406049] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:16:19,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:16:19,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 19 [2022-04-06 18:16:19,867 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:16:19,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1541577837] [2022-04-06 18:16:19,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1541577837] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:16:19,867 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:16:19,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 18:16:19,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713880643] [2022-04-06 18:16:19,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:16:19,869 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 18:16:19,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:16:19,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 18:16:19,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2022-04-06 18:16:19,870 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-04-06 18:16:22,280 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.96s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:16:24,284 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:16:25,780 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.49s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:16:25,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:16:25,959 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2022-04-06 18:16:25,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 18:16:25,960 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 46 [2022-04-06 18:16:25,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:16:25,960 INFO L225 Difference]: With dead ends: 63 [2022-04-06 18:16:25,961 INFO L226 Difference]: Without dead ends: 61 [2022-04-06 18:16:25,961 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2022-04-06 18:16:25,961 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2022-04-06 18:16:25,962 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 186 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 216 Invalid, 1 Unknown, 0 Unchecked, 6.0s Time] [2022-04-06 18:16:25,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-04-06 18:16:25,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 50. [2022-04-06 18:16:25,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-06 18:16:25,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-04-06 18:16:25,969 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 46 [2022-04-06 18:16:25,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:16:25,969 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-04-06 18:16:25,969 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-04-06 18:16:25,969 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-04-06 18:16:25,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-04-06 18:16:25,970 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:16:25,970 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:16:25,993 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 18:16:26,191 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:16:26,191 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:16:26,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:16:26,192 INFO L85 PathProgramCache]: Analyzing trace with hash 4200374, now seen corresponding path program 3 times [2022-04-06 18:16:26,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:16:26,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [704217227] [2022-04-06 18:16:26,192 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:16:26,192 INFO L85 PathProgramCache]: Analyzing trace with hash 4200374, now seen corresponding path program 4 times [2022-04-06 18:16:26,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:16:26,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040567788] [2022-04-06 18:16:26,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:16:26,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:16:26,200 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:16:26,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1644808344] [2022-04-06 18:16:26,200 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 18:16:26,200 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:16:26,201 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:16:26,211 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) [2022-04-06 18:16:26,212 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 18:16:26,276 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 18:16:26,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:16:26,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 29 conjunts are in the unsatisfiable core [2022-04-06 18:16:26,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:16:31,884 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-04-06 18:16:31,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:16:39,443 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-04-06 18:16:39,443 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:16:39,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040567788] [2022-04-06 18:16:39,444 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:16:39,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644808344] [2022-04-06 18:16:39,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1644808344] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:16:39,444 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:16:39,444 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 17 [2022-04-06 18:16:39,444 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:16:39,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [704217227] [2022-04-06 18:16:39,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [704217227] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:16:39,444 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:16:39,444 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 18:16:39,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541746987] [2022-04-06 18:16:39,445 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:16:39,445 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 18:16:39,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:16:39,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 18:16:39,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=218, Unknown=1, NotChecked=0, Total=272 [2022-04-06 18:16:39,445 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-04-06 18:16:42,379 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.74s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:16:42,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:16:42,724 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2022-04-06 18:16:42,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 18:16:42,724 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 46 [2022-04-06 18:16:42,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:16:42,725 INFO L225 Difference]: With dead ends: 68 [2022-04-06 18:16:42,725 INFO L226 Difference]: Without dead ends: 66 [2022-04-06 18:16:42,725 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=66, Invalid=275, Unknown=1, NotChecked=0, Total=342 [2022-04-06 18:16:42,726 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 18 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-04-06 18:16:42,726 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 188 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-04-06 18:16:42,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-04-06 18:16:42,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2022-04-06 18:16:42,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 45 states have internal predecessors, (48), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 18:16:42,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 69 transitions. [2022-04-06 18:16:42,747 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 69 transitions. Word has length 46 [2022-04-06 18:16:42,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:16:42,747 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 69 transitions. [2022-04-06 18:16:42,747 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-04-06 18:16:42,747 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 69 transitions. [2022-04-06 18:16:42,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-04-06 18:16:42,749 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:16:42,749 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:16:42,769 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 18:16:42,966 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-04-06 18:16:42,966 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:16:42,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:16:42,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1779207736, now seen corresponding path program 3 times [2022-04-06 18:16:42,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:16:42,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [89622830] [2022-04-06 18:16:42,967 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:16:42,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1779207736, now seen corresponding path program 4 times [2022-04-06 18:16:42,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:16:42,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276639145] [2022-04-06 18:16:42,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:16:42,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:16:43,012 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:16:43,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1551944811] [2022-04-06 18:16:43,012 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 18:16:43,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:16:43,013 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:16:43,020 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) [2022-04-06 18:16:43,085 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 18:16:43,090 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 18:16:43,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:16:43,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 27 conjunts are in the unsatisfiable core [2022-04-06 18:16:43,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:16:45,195 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-04-06 18:16:45,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:16:48,492 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-04-06 18:16:48,492 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:16:48,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276639145] [2022-04-06 18:16:48,492 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:16:48,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551944811] [2022-04-06 18:16:48,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1551944811] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:16:48,493 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:16:48,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 24 [2022-04-06 18:16:48,493 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:16:48,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [89622830] [2022-04-06 18:16:48,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [89622830] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:16:48,493 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:16:48,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 18:16:48,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516215416] [2022-04-06 18:16:48,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:16:48,494 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 18:16:48,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:16:48,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 18:16:48,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=457, Unknown=0, NotChecked=0, Total=552 [2022-04-06 18:16:48,494 INFO L87 Difference]: Start difference. First operand 62 states and 69 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-04-06 18:16:49,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:16:49,021 INFO L93 Difference]: Finished difference Result 78 states and 85 transitions. [2022-04-06 18:16:49,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 18:16:49,021 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 46 [2022-04-06 18:16:49,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:16:49,022 INFO L225 Difference]: With dead ends: 78 [2022-04-06 18:16:49,022 INFO L226 Difference]: Without dead ends: 76 [2022-04-06 18:16:49,022 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=113, Invalid=589, Unknown=0, NotChecked=0, Total=702 [2022-04-06 18:16:49,023 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 27 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 18:16:49,023 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 153 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 18:16:49,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-04-06 18:16:49,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 50. [2022-04-06 18:16:49,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-06 18:16:49,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-04-06 18:16:49,032 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 46 [2022-04-06 18:16:49,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:16:49,032 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-04-06 18:16:49,032 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-04-06 18:16:49,032 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-04-06 18:16:49,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-04-06 18:16:49,033 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:16:49,033 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:16:49,061 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 18:16:49,249 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-04-06 18:16:49,250 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:16:49,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:16:49,250 INFO L85 PathProgramCache]: Analyzing trace with hash 1060406066, now seen corresponding path program 5 times [2022-04-06 18:16:49,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:16:49,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [345682527] [2022-04-06 18:16:49,251 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:16:49,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1060406066, now seen corresponding path program 6 times [2022-04-06 18:16:49,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:16:49,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277761571] [2022-04-06 18:16:49,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:16:49,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:16:49,258 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:16:49,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1191624599] [2022-04-06 18:16:49,258 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 18:16:49,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:16:49,258 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:16:49,275 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) [2022-04-06 18:16:49,282 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 18:16:49,367 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-04-06 18:16:49,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:16:49,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 18 conjunts are in the unsatisfiable core [2022-04-06 18:16:49,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:16:53,692 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 18:16:59,290 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-04-06 18:16:59,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:17:06,162 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-04-06 18:17:06,163 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:17:06,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277761571] [2022-04-06 18:17:06,163 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:17:06,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191624599] [2022-04-06 18:17:06,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191624599] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:17:06,164 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:17:06,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 14 [2022-04-06 18:17:06,164 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:17:06,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [345682527] [2022-04-06 18:17:06,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [345682527] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:17:06,164 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:17:06,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 18:17:06,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756587427] [2022-04-06 18:17:06,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:17:06,165 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 18:17:06,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:17:06,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 18:17:06,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=141, Unknown=2, NotChecked=0, Total=182 [2022-04-06 18:17:06,166 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 11 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-04-06 18:17:07,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:17:07,695 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2022-04-06 18:17:07,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 18:17:07,695 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 55 [2022-04-06 18:17:07,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:17:07,696 INFO L225 Difference]: With dead ends: 73 [2022-04-06 18:17:07,696 INFO L226 Difference]: Without dead ends: 71 [2022-04-06 18:17:07,696 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=52, Invalid=186, Unknown=2, NotChecked=0, Total=240 [2022-04-06 18:17:07,696 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 16 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-04-06 18:17:07,697 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 143 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 92 Invalid, 0 Unknown, 18 Unchecked, 1.5s Time] [2022-04-06 18:17:07,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-04-06 18:17:07,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 50. [2022-04-06 18:17:07,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-06 18:17:07,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-04-06 18:17:07,706 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 55 [2022-04-06 18:17:07,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:17:07,706 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-04-06 18:17:07,706 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-04-06 18:17:07,706 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-04-06 18:17:07,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-04-06 18:17:07,707 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:17:07,707 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:17:07,726 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-06 18:17:07,908 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-04-06 18:17:07,908 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:17:07,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:17:07,909 INFO L85 PathProgramCache]: Analyzing trace with hash -1459553868, now seen corresponding path program 5 times [2022-04-06 18:17:07,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:17:07,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [615315343] [2022-04-06 18:17:07,909 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:17:07,909 INFO L85 PathProgramCache]: Analyzing trace with hash -1459553868, now seen corresponding path program 6 times [2022-04-06 18:17:07,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:17:07,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356867728] [2022-04-06 18:17:07,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:17:07,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:17:07,928 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:17:07,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2088240281] [2022-04-06 18:17:07,928 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 18:17:07,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:17:07,928 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:17:07,944 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) [2022-04-06 18:17:07,945 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 18:17:07,984 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 18:17:07,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:17:07,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-06 18:17:07,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:17:12,399 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 18:17:18,542 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 28 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-04-06 18:17:18,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:17:22,429 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-04-06 18:17:22,429 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:17:22,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356867728] [2022-04-06 18:17:22,429 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:17:22,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088240281] [2022-04-06 18:17:22,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088240281] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:17:22,429 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:17:22,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 18 [2022-04-06 18:17:22,430 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:17:22,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [615315343] [2022-04-06 18:17:22,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [615315343] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:17:22,431 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:17:22,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 18:17:22,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272134442] [2022-04-06 18:17:22,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:17:22,431 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 18:17:22,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:17:22,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 18:17:22,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=239, Unknown=4, NotChecked=0, Total=306 [2022-04-06 18:17:22,432 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-04-06 18:17:26,812 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:17:28,588 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:17:28,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:17:28,668 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2022-04-06 18:17:28,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 18:17:28,669 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 55 [2022-04-06 18:17:28,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:17:28,669 INFO L225 Difference]: With dead ends: 80 [2022-04-06 18:17:28,669 INFO L226 Difference]: Without dead ends: 50 [2022-04-06 18:17:28,670 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=109, Invalid=393, Unknown=4, NotChecked=0, Total=506 [2022-04-06 18:17:28,670 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 16 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-04-06 18:17:28,670 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 148 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 115 Invalid, 1 Unknown, 8 Unchecked, 4.2s Time] [2022-04-06 18:17:28,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-04-06 18:17:28,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-04-06 18:17:28,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 35 states have internal predecessors, (35), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-06 18:17:28,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2022-04-06 18:17:28,684 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 55 [2022-04-06 18:17:28,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:17:28,684 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2022-04-06 18:17:28,684 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-04-06 18:17:28,684 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2022-04-06 18:17:28,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-04-06 18:17:28,687 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:17:28,687 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:17:28,703 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-06 18:17:28,903 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-04-06 18:17:28,903 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:17:28,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:17:28,904 INFO L85 PathProgramCache]: Analyzing trace with hash 1954893684, now seen corresponding path program 5 times [2022-04-06 18:17:28,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:17:28,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [188548120] [2022-04-06 18:17:28,904 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:17:28,904 INFO L85 PathProgramCache]: Analyzing trace with hash 1954893684, now seen corresponding path program 6 times [2022-04-06 18:17:28,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:17:28,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445840742] [2022-04-06 18:17:28,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:17:28,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:17:28,910 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:17:28,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [613802512] [2022-04-06 18:17:28,910 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 18:17:28,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:17:28,911 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:17:28,917 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) [2022-04-06 18:17:28,918 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 18:17:28,963 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 18:17:28,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:17:28,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 31 conjunts are in the unsatisfiable core [2022-04-06 18:17:28,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:17:30,248 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 18:17:46,361 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 17 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 18:17:46,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:17:48,717 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 18:18:12,335 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:18:12,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445840742] [2022-04-06 18:18:12,336 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:18:12,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613802512] [2022-04-06 18:18:12,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613802512] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 18:18:12,336 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 18:18:12,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-04-06 18:18:12,336 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:18:12,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [188548120] [2022-04-06 18:18:12,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [188548120] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:18:12,336 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:18:12,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 18:18:12,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999646310] [2022-04-06 18:18:12,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:18:12,337 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 18:18:12,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:18:12,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 18:18:12,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2022-04-06 18:18:12,337 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 16 states have internal predecessors, (33), 5 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2022-04-06 18:18:14,829 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:18:17,426 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:18:18,547 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:18:19,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:18:19,697 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2022-04-06 18:18:19,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-04-06 18:18:19,697 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 16 states have internal predecessors, (33), 5 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 55 [2022-04-06 18:18:19,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:18:19,698 INFO L225 Difference]: With dead ends: 64 [2022-04-06 18:18:19,698 INFO L226 Difference]: Without dead ends: 62 [2022-04-06 18:18:19,698 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=111, Invalid=591, Unknown=0, NotChecked=0, Total=702 [2022-04-06 18:18:19,699 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 31 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 8 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2022-04-06 18:18:19,699 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 181 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 319 Invalid, 2 Unknown, 1 Unchecked, 7.2s Time] [2022-04-06 18:18:19,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-04-06 18:18:19,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 59. [2022-04-06 18:18:19,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 41 states have (on average 1.024390243902439) internal successors, (42), 42 states have internal predecessors, (42), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-04-06 18:18:19,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-04-06 18:18:19,708 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2022-04-06 18:18:19,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:18:19,708 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-04-06 18:18:19,708 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 16 states have internal predecessors, (33), 5 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2022-04-06 18:18:19,708 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-04-06 18:18:19,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-04-06 18:18:19,709 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:18:19,709 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:18:19,757 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-04-06 18:18:19,909 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 18:18:19,909 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:18:19,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:18:19,910 INFO L85 PathProgramCache]: Analyzing trace with hash 1351365048, now seen corresponding path program 7 times [2022-04-06 18:18:19,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:18:19,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1950690858] [2022-04-06 18:18:19,910 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:18:19,910 INFO L85 PathProgramCache]: Analyzing trace with hash 1351365048, now seen corresponding path program 8 times [2022-04-06 18:18:19,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:18:19,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199387974] [2022-04-06 18:18:19,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:18:19,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:18:19,917 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:18:19,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2045421894] [2022-04-06 18:18:19,917 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 18:18:19,917 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:18:19,917 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:18:19,918 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) [2022-04-06 18:18:19,919 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-04-06 18:18:19,959 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 18:18:19,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:18:19,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 49 conjunts are in the unsatisfiable core [2022-04-06 18:18:19,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:18:28,642 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 18 proven. 46 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-04-06 18:18:28,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:18:41,219 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:18:41,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199387974] [2022-04-06 18:18:41,219 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:18:41,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045421894] [2022-04-06 18:18:41,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045421894] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 18:18:41,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 18:18:41,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-04-06 18:18:41,220 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:18:41,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1950690858] [2022-04-06 18:18:41,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1950690858] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:18:41,220 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:18:41,220 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 18:18:41,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643706409] [2022-04-06 18:18:41,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:18:41,220 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 18:18:41,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:18:41,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 18:18:41,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-04-06 18:18:41,221 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 16 states have internal predecessors, (37), 6 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2022-04-06 18:18:42,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:18:42,090 INFO L93 Difference]: Finished difference Result 73 states and 75 transitions. [2022-04-06 18:18:42,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-04-06 18:18:42,091 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 16 states have internal predecessors, (37), 6 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) Word has length 64 [2022-04-06 18:18:42,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:18:42,092 INFO L225 Difference]: With dead ends: 73 [2022-04-06 18:18:42,092 INFO L226 Difference]: Without dead ends: 71 [2022-04-06 18:18:42,092 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 60 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=166, Invalid=764, Unknown=0, NotChecked=0, Total=930 [2022-04-06 18:18:42,092 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 36 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-04-06 18:18:42,093 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 172 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-04-06 18:18:42,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-04-06 18:18:42,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2022-04-06 18:18:42,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 49 states have internal predecessors, (49), 11 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 18:18:42,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2022-04-06 18:18:42,111 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 64 [2022-04-06 18:18:42,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:18:42,111 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2022-04-06 18:18:42,111 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 16 states have internal predecessors, (37), 6 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2022-04-06 18:18:42,111 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2022-04-06 18:18:42,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-04-06 18:18:42,114 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:18:42,114 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:18:42,131 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-04-06 18:18:42,330 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-06 18:18:42,331 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:18:42,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:18:42,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1420139508, now seen corresponding path program 9 times [2022-04-06 18:18:42,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:18:42,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1452979560] [2022-04-06 18:18:42,331 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:18:42,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1420139508, now seen corresponding path program 10 times [2022-04-06 18:18:42,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:18:42,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420577906] [2022-04-06 18:18:42,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:18:42,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:18:42,360 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:18:42,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [579975616] [2022-04-06 18:18:42,363 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 18:18:42,363 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:18:42,363 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:18:42,364 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) [2022-04-06 18:18:42,364 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-04-06 18:18:42,404 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 18:18:42,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:18:42,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 45 conjunts are in the unsatisfiable core [2022-04-06 18:18:42,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:25:36,863 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 32 proven. 62 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-06 18:25:36,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:25:44,980 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:25:44,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420577906] [2022-04-06 18:25:44,981 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:25:44,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579975616] [2022-04-06 18:25:44,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579975616] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 18:25:44,981 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 18:25:44,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2022-04-06 18:25:44,981 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:25:44,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1452979560] [2022-04-06 18:25:44,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1452979560] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:25:44,981 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:25:44,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-04-06 18:25:44,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143593080] [2022-04-06 18:25:44,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:25:44,982 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-04-06 18:25:44,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:25:44,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-04-06 18:25:44,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=629, Unknown=1, NotChecked=0, Total=756 [2022-04-06 18:25:44,982 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 19 states have internal predecessors, (41), 7 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2022-04-06 18:25:50,849 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 18:25:51,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:25:51,660 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2022-04-06 18:25:51,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-04-06 18:25:51,660 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 19 states have internal predecessors, (41), 7 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) Word has length 73 [2022-04-06 18:25:51,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:25:51,661 INFO L225 Difference]: With dead ends: 82 [2022-04-06 18:25:51,661 INFO L226 Difference]: Without dead ends: 80 [2022-04-06 18:25:51,662 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=143, Invalid=786, Unknown=1, NotChecked=0, Total=930 [2022-04-06 18:25:51,662 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 43 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 506 mSolverCounterSat, 14 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 506 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-04-06 18:25:51,662 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 202 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 506 Invalid, 1 Unknown, 0 Unchecked, 6.6s Time] [2022-04-06 18:25:51,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-04-06 18:25:51,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2022-04-06 18:25:51,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 55 states have (on average 1.018181818181818) internal successors, (56), 56 states have internal predecessors, (56), 12 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-04-06 18:25:51,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2022-04-06 18:25:51,677 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2022-04-06 18:25:51,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:25:51,677 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2022-04-06 18:25:51,678 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 19 states have internal predecessors, (41), 7 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2022-04-06 18:25:51,678 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2022-04-06 18:25:51,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-04-06 18:25:51,678 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:25:51,678 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 6, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:25:51,698 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-04-06 18:25:51,896 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:25:51,897 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:25:51,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:25:51,897 INFO L85 PathProgramCache]: Analyzing trace with hash -2034633416, now seen corresponding path program 11 times [2022-04-06 18:25:51,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:25:51,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1360050931] [2022-04-06 18:25:51,897 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:25:51,898 INFO L85 PathProgramCache]: Analyzing trace with hash -2034633416, now seen corresponding path program 12 times [2022-04-06 18:25:51,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:25:51,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391872219] [2022-04-06 18:25:51,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:25:51,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:25:51,903 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:25:51,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [40075132] [2022-04-06 18:25:51,904 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 18:25:51,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:25:51,904 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:25:51,905 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) [2022-04-06 18:25:51,905 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-04-06 18:25:52,252 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 18:25:52,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:25:52,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 29 conjunts are in the unsatisfiable core [2022-04-06 18:25:52,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:25:54,125 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 18:25:57,742 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 32 proven. 88 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-04-06 18:25:57,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 18:26:01,073 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 82 proven. 38 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-04-06 18:26:01,074 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 18:26:01,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391872219] [2022-04-06 18:26:01,074 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 18:26:01,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40075132] [2022-04-06 18:26:01,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40075132] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 18:26:01,074 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 18:26:01,074 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 18] total 41 [2022-04-06 18:26:01,074 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 18:26:01,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1360050931] [2022-04-06 18:26:01,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1360050931] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 18:26:01,074 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 18:26:01,074 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-04-06 18:26:01,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846271555] [2022-04-06 18:26:01,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 18:26:01,075 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-04-06 18:26:01,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 18:26:01,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-04-06 18:26:01,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=1258, Unknown=2, NotChecked=0, Total=1640 [2022-04-06 18:26:01,076 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 29 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 27 states have internal predecessors, (45), 8 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2022-04-06 18:26:04,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 18:26:04,967 INFO L93 Difference]: Finished difference Result 91 states and 93 transitions. [2022-04-06 18:26:04,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-04-06 18:26:04,967 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 27 states have internal predecessors, (45), 8 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) Word has length 82 [2022-04-06 18:26:04,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 18:26:04,968 INFO L225 Difference]: With dead ends: 91 [2022-04-06 18:26:04,968 INFO L226 Difference]: Without dead ends: 89 [2022-04-06 18:26:04,969 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 125 SyntacticMatches, 5 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 5 DeprecatedPredicates, 1197 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=759, Invalid=2545, Unknown=2, NotChecked=0, Total=3306 [2022-04-06 18:26:04,969 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 82 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 18:26:04,970 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 128 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 268 Invalid, 0 Unknown, 61 Unchecked, 0.4s Time] [2022-04-06 18:26:04,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-04-06 18:26:04,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2022-04-06 18:26:04,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 63 states have internal predecessors, (63), 13 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 18:26:04,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2022-04-06 18:26:04,991 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 82 [2022-04-06 18:26:04,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 18:26:04,991 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2022-04-06 18:26:04,991 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 27 states have internal predecessors, (45), 8 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2022-04-06 18:26:04,992 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2022-04-06 18:26:04,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-04-06 18:26:04,993 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 18:26:04,993 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 18:26:04,998 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-04-06 18:26:05,194 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-04-06 18:26:05,195 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 18:26:05,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 18:26:05,195 INFO L85 PathProgramCache]: Analyzing trace with hash -688142220, now seen corresponding path program 13 times [2022-04-06 18:26:05,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 18:26:05,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [22299095] [2022-04-06 18:26:05,196 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 18:26:05,196 INFO L85 PathProgramCache]: Analyzing trace with hash -688142220, now seen corresponding path program 14 times [2022-04-06 18:26:05,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 18:26:05,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349647882] [2022-04-06 18:26:05,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 18:26:05,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 18:26:05,201 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 18:26:05,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1491328233] [2022-04-06 18:26:05,202 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 18:26:05,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 18:26:05,202 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 18:26:05,205 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) [2022-04-06 18:26:05,206 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-04-06 18:26:05,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 18:26:05,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 18:26:05,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 31 conjunts are in the unsatisfiable core [2022-04-06 18:26:05,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 18:26:05,630 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 116 proven. 23 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-04-06 18:26:05,630 INFO L328 TraceCheckSpWp]: Computing backward predicates...