/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/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/in-de51.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:46:46,786 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:46:46,793 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:46:46,822 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:46:46,864 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:46:46,864 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:46:46,865 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:46:46,866 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:46:46,875 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:46:46,875 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:46:46,877 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:46:46,877 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:46:46,877 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:46:46,877 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:46:46,877 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:46:46,877 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:46:46,877 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:46:46,878 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:46:46,878 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:46:46,878 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:46:46,878 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:46:46,878 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:46:46,879 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:46:46,879 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:46:46,879 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:46:46,879 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:46:46,879 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:46:46,879 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:46:46,879 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:46:46,879 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:46:46,879 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:46:47,069 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:46:47,089 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:46:47,090 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:46:47,091 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:46:47,092 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:46:47,093 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de51.c [2022-03-20 18:46:47,138 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5f6fde9fa/97daf749bf634c19affa5bca5c60ccec/FLAG29feb1563 [2022-03-20 18:46:47,517 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:46:47,517 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de51.c [2022-03-20 18:46:47,521 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5f6fde9fa/97daf749bf634c19affa5bca5c60ccec/FLAG29feb1563 [2022-03-20 18:46:47,535 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5f6fde9fa/97daf749bf634c19affa5bca5c60ccec [2022-03-20 18:46:47,537 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:46:47,539 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:46:47,540 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:46:47,540 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:46:47,543 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:46:47,543 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,544 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@555cb88c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47, skipping insertion in model container [2022-03-20 18:46:47,544 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,550 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:46:47,559 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:46:47,692 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de51.c[368,381] [2022-03-20 18:46:47,706 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:46:47,712 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:46:47,722 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de51.c[368,381] [2022-03-20 18:46:47,728 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:46:47,739 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:46:47,740 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47 WrapperNode [2022-03-20 18:46:47,740 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:46:47,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:46:47,742 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:46:47,742 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:46:47,750 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,751 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,755 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,756 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,767 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,773 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,777 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,781 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:46:47,782 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:46:47,782 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:46:47,782 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:46:47,783 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (1/1) ... [2022-03-20 18:46:47,788 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:46:47,795 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:47,806 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) [2022-03-20 18:46:47,815 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 [2022-03-20 18:46:47,835 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:46:47,835 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:46:47,836 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:46:47,836 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:46:47,836 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:46:47,836 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:46:47,836 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:46:47,836 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:46:47,836 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:46:47,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 18:46:47,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:46:47,837 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:46:47,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:46:47,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:46:47,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:46:47,838 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:46:47,838 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:46:47,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:46:47,884 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:46:47,885 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:46:48,010 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:46:48,014 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:46:48,015 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2022-03-20 18:46:48,016 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:46:48 BoogieIcfgContainer [2022-03-20 18:46:48,016 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:46:48,032 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:46:48,032 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:46:48,034 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:46:48,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:46:47" (1/3) ... [2022-03-20 18:46:48,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@313d9644 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:46:48, skipping insertion in model container [2022-03-20 18:46:48,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:46:47" (2/3) ... [2022-03-20 18:46:48,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@313d9644 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:46:48, skipping insertion in model container [2022-03-20 18:46:48,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:46:48" (3/3) ... [2022-03-20 18:46:48,036 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de51.c [2022-03-20 18:46:48,040 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:46:48,040 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:46:48,082 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:46:48,090 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 [2022-03-20 18:46:48,090 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:46:48,103 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 18:46:48,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 18:46:48,112 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:48,113 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:48,113 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:48,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:48,117 INFO L85 PathProgramCache]: Analyzing trace with hash -1060076674, now seen corresponding path program 1 times [2022-03-20 18:46:48,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1913750616] [2022-03-20 18:46:48,132 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:46:48,132 INFO L85 PathProgramCache]: Analyzing trace with hash -1060076674, now seen corresponding path program 2 times [2022-03-20 18:46:48,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:48,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119218757] [2022-03-20 18:46:48,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:48,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:48,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:48,297 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:48,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:48,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:48,307 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:48,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119218757] [2022-03-20 18:46:48,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119218757] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:48,308 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:48,308 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:46:48,310 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:48,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1913750616] [2022-03-20 18:46:48,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1913750616] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:48,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:48,311 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:46:48,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941147983] [2022-03-20 18:46:48,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:48,314 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 18:46:48,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 18:46:48,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:46:48,335 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) 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, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:48,367 INFO L93 Difference]: Finished difference Result 41 states and 60 transitions. [2022-03-20 18:46:48,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 18:46:48,369 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, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-20 18:46:48,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:48,373 INFO L225 Difference]: With dead ends: 41 [2022-03-20 18:46:48,373 INFO L226 Difference]: Without dead ends: 17 [2022-03-20 18:46:48,376 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:46:48,379 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 19 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:48,382 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 30 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:46:48,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-20 18:46:48,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-20 18:46:48,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-03-20 18:46:48,404 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 16 [2022-03-20 18:46:48,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:48,404 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-03-20 18:46:48,404 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, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,404 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-03-20 18:46:48,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 18:46:48,405 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:48,405 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:48,405 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:46:48,405 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:48,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:48,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1174593278, now seen corresponding path program 1 times [2022-03-20 18:46:48,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [65982086] [2022-03-20 18:46:48,406 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:46:48,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1174593278, now seen corresponding path program 2 times [2022-03-20 18:46:48,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:48,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340091254] [2022-03-20 18:46:48,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:48,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:48,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:48,569 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:48,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:48,580 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:48,580 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:48,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340091254] [2022-03-20 18:46:48,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340091254] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:48,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:48,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:46:48,581 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:48,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [65982086] [2022-03-20 18:46:48,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [65982086] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:48,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:48,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:46:48,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962213152] [2022-03-20 18:46:48,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:48,582 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:46:48,582 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:46:48,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:46:48,583 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:48,655 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2022-03-20 18:46:48,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:46:48,655 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-20 18:46:48,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:48,656 INFO L225 Difference]: With dead ends: 28 [2022-03-20 18:46:48,656 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 18:46:48,656 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:46:48,657 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:48,658 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 31 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:46:48,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 18:46:48,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-20 18:46:48,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-03-20 18:46:48,663 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 16 [2022-03-20 18:46:48,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:48,663 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-03-20 18:46:48,663 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,663 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-03-20 18:46:48,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:46:48,664 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:48,664 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:48,664 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:46:48,664 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:48,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:48,664 INFO L85 PathProgramCache]: Analyzing trace with hash -2018158143, now seen corresponding path program 1 times [2022-03-20 18:46:48,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [325577994] [2022-03-20 18:46:48,665 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 18:46:48,665 INFO L85 PathProgramCache]: Analyzing trace with hash -2018158143, now seen corresponding path program 2 times [2022-03-20 18:46:48,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:48,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210453403] [2022-03-20 18:46:48,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:48,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:48,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:48,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:48,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:48,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:48,697 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:48,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210453403] [2022-03-20 18:46:48,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210453403] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:48,697 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:48,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:46:48,697 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:48,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [325577994] [2022-03-20 18:46:48,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [325577994] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:48,698 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:48,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:46:48,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694693950] [2022-03-20 18:46:48,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:48,698 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 18:46:48,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 18:46:48,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 18:46:48,699 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:48,737 INFO L93 Difference]: Finished difference Result 35 states and 48 transitions. [2022-03-20 18:46:48,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 18:46:48,737 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:46:48,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:48,738 INFO L225 Difference]: With dead ends: 35 [2022-03-20 18:46:48,738 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 18:46:48,739 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:46:48,739 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 21 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:48,740 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 26 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:46:48,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 18:46:48,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-20 18:46:48,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2022-03-20 18:46:48,746 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 17 [2022-03-20 18:46:48,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:48,747 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2022-03-20 18:46:48,747 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,747 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2022-03-20 18:46:48,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:46:48,747 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:48,747 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:48,747 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:46:48,748 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:48,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:48,748 INFO L85 PathProgramCache]: Analyzing trace with hash -615329744, now seen corresponding path program 1 times [2022-03-20 18:46:48,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1231268368] [2022-03-20 18:46:48,749 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 18:46:48,749 INFO L85 PathProgramCache]: Analyzing trace with hash -615329744, now seen corresponding path program 2 times [2022-03-20 18:46:48,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:48,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391372630] [2022-03-20 18:46:48,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:48,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:48,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:48,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:48,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:48,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:48,809 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:48,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391372630] [2022-03-20 18:46:48,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391372630] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:48,809 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:48,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:46:48,809 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:48,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1231268368] [2022-03-20 18:46:48,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1231268368] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:48,810 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:48,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:46:48,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104350614] [2022-03-20 18:46:48,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:48,810 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 18:46:48,810 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 18:46:48,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 18:46:48,811 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:48,852 INFO L93 Difference]: Finished difference Result 44 states and 63 transitions. [2022-03-20 18:46:48,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 18:46:48,852 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:46:48,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:48,854 INFO L225 Difference]: With dead ends: 44 [2022-03-20 18:46:48,854 INFO L226 Difference]: Without dead ends: 34 [2022-03-20 18:46:48,854 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:46:48,855 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 23 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:48,860 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 25 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:46:48,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-20 18:46:48,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2022-03-20 18:46:48,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 44 transitions. [2022-03-20 18:46:48,869 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 44 transitions. Word has length 17 [2022-03-20 18:46:48,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:48,869 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 44 transitions. [2022-03-20 18:46:48,869 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:48,869 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 44 transitions. [2022-03-20 18:46:48,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:46:48,870 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:48,870 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:48,870 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 18:46:48,870 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:48,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:48,871 INFO L85 PathProgramCache]: Analyzing trace with hash -578961840, now seen corresponding path program 1 times [2022-03-20 18:46:48,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:48,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [644616964] [2022-03-20 18:46:49,051 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:49,054 INFO L85 PathProgramCache]: Analyzing trace with hash 1386235727, now seen corresponding path program 1 times [2022-03-20 18:46:49,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:49,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149365895] [2022-03-20 18:46:49,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:49,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:49,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:49,476 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:49,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:49,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:49,486 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:49,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149365895] [2022-03-20 18:46:49,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149365895] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:49,487 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:49,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:46:49,588 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:49,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [644616964] [2022-03-20 18:46:49,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [644616964] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:49,588 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:49,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:46:49,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380212295] [2022-03-20 18:46:49,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:49,589 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:46:49,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:49,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:46:49,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:46:49,590 INFO L87 Difference]: Start difference. First operand 32 states and 44 transitions. Second operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:49,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:49,737 INFO L93 Difference]: Finished difference Result 44 states and 61 transitions. [2022-03-20 18:46:49,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:46:49,737 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:46:49,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:49,738 INFO L225 Difference]: With dead ends: 44 [2022-03-20 18:46:49,738 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 18:46:49,739 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:46:49,743 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 26 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:49,745 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 49 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:49,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 18:46:49,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-20 18:46:49,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:49,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 35 transitions. [2022-03-20 18:46:49,750 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 35 transitions. Word has length 17 [2022-03-20 18:46:49,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:49,750 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 35 transitions. [2022-03-20 18:46:49,750 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:49,751 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 35 transitions. [2022-03-20 18:46:49,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:46:49,751 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:49,751 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:49,751 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 18:46:49,751 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:49,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:49,752 INFO L85 PathProgramCache]: Analyzing trace with hash 388404751, now seen corresponding path program 1 times [2022-03-20 18:46:49,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:49,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1764468082] [2022-03-20 18:46:49,952 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:49,953 INFO L85 PathProgramCache]: Analyzing trace with hash -679545490, now seen corresponding path program 1 times [2022-03-20 18:46:49,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:49,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326819858] [2022-03-20 18:46:49,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:49,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:49,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:50,152 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:50,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:50,163 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:50,164 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:50,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326819858] [2022-03-20 18:46:50,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326819858] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:50,164 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:50,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:46:50,233 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:50,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1764468082] [2022-03-20 18:46:50,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1764468082] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:50,234 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:50,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:46:50,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28829004] [2022-03-20 18:46:50,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:50,234 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:46:50,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:50,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:46:50,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:46:50,235 INFO L87 Difference]: Start difference. First operand 26 states and 35 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:50,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:50,542 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-03-20 18:46:50,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:46:50,542 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:46:50,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:50,543 INFO L225 Difference]: With dead ends: 32 [2022-03-20 18:46:50,543 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 18:46:50,543 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:46:50,544 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 29 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:50,544 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 45 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:50,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 18:46:50,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-20 18:46:50,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:50,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2022-03-20 18:46:50,549 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 17 [2022-03-20 18:46:50,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:50,549 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2022-03-20 18:46:50,549 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:50,549 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2022-03-20 18:46:50,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:46:50,550 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:50,550 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:50,550 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-20 18:46:50,550 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:50,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:50,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1130976308, now seen corresponding path program 1 times [2022-03-20 18:46:50,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:50,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1671752368] [2022-03-20 18:46:50,689 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:50,690 INFO L85 PathProgramCache]: Analyzing trace with hash -951480075, now seen corresponding path program 1 times [2022-03-20 18:46:50,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:50,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685530133] [2022-03-20 18:46:50,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:50,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:50,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:50,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:50,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:50,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:50,754 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:50,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685530133] [2022-03-20 18:46:50,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685530133] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:50,755 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:50,755 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:46:50,778 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:50,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1671752368] [2022-03-20 18:46:50,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1671752368] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:50,784 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:50,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:46:50,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416745680] [2022-03-20 18:46:50,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:50,785 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:46:50,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:50,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:46:50,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:46:50,786 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:50,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:50,855 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2022-03-20 18:46:50,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:46:50,855 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-20 18:46:50,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:50,856 INFO L225 Difference]: With dead ends: 35 [2022-03-20 18:46:50,856 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 18:46:50,856 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:46:50,858 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:50,858 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 29 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:46:50,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 18:46:50,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2022-03-20 18:46:50,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:50,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2022-03-20 18:46:50,872 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 18 [2022-03-20 18:46:50,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:50,872 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2022-03-20 18:46:50,873 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:50,873 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2022-03-20 18:46:50,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:46:50,873 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:50,873 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:50,873 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-20 18:46:50,873 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:50,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:50,874 INFO L85 PathProgramCache]: Analyzing trace with hash 629336803, now seen corresponding path program 1 times [2022-03-20 18:46:50,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:50,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1893717870] [2022-03-20 18:46:50,994 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:50,994 INFO L85 PathProgramCache]: Analyzing trace with hash -493889564, now seen corresponding path program 1 times [2022-03-20 18:46:50,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:50,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229347650] [2022-03-20 18:46:50,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:50,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:51,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:51,050 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:51,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:51,054 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:51,054 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:51,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229347650] [2022-03-20 18:46:51,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229347650] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:51,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377882677] [2022-03-20 18:46:51,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:51,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:51,055 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:51,056 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) [2022-03-20 18:46:51,060 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 18:46:51,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:51,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 18:46:51,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:51,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:51,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:51,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:51,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377882677] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:51,208 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-20 18:46:51,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 8 [2022-03-20 18:46:51,222 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:51,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1893717870] [2022-03-20 18:46:51,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1893717870] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:51,223 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:51,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:46:51,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988641123] [2022-03-20 18:46:51,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:51,223 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:46:51,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:51,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:46:51,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:46:51,223 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:51,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:51,258 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2022-03-20 18:46:51,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:46:51,258 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-20 18:46:51,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:51,259 INFO L225 Difference]: With dead ends: 30 [2022-03-20 18:46:51,260 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 18:46:51,260 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:46:51,261 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:51,261 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 51 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:46:51,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 18:46:51,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2022-03-20 18:46:51,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:51,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-03-20 18:46:51,265 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 18 [2022-03-20 18:46:51,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:51,265 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-03-20 18:46:51,265 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:51,265 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-03-20 18:46:51,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 18:46:51,266 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:51,266 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:51,286 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:51,483 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:51,483 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:51,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:51,483 INFO L85 PathProgramCache]: Analyzing trace with hash 9935328, now seen corresponding path program 1 times [2022-03-20 18:46:51,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:51,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1123505605] [2022-03-20 18:46:51,683 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:51,684 INFO L85 PathProgramCache]: Analyzing trace with hash -778984257, now seen corresponding path program 1 times [2022-03-20 18:46:51,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:51,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382874816] [2022-03-20 18:46:51,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:51,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:51,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:51,749 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:51,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:51,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:51,756 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:51,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382874816] [2022-03-20 18:46:51,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382874816] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:51,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202933817] [2022-03-20 18:46:51,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:51,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:51,756 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:51,757 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) [2022-03-20 18:46:51,758 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 18:46:51,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:51,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:46:51,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:51,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:51,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:51,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:51,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202933817] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:51,902 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:51,902 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 12 [2022-03-20 18:46:51,954 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:51,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1123505605] [2022-03-20 18:46:51,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1123505605] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:51,954 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:51,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:46:51,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182393383] [2022-03-20 18:46:51,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:51,954 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:46:51,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:51,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:46:51,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:46:51,955 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:52,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:52,114 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2022-03-20 18:46:52,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:46:52,114 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-20 18:46:52,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:52,114 INFO L225 Difference]: With dead ends: 35 [2022-03-20 18:46:52,115 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:46:52,115 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:46:52,115 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:52,115 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 37 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:52,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:46:52,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2022-03-20 18:46:52,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:52,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2022-03-20 18:46:52,123 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 19 [2022-03-20 18:46:52,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:52,123 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2022-03-20 18:46:52,123 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:52,123 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2022-03-20 18:46:52,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:46:52,125 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:52,125 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:52,145 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:52,335 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,SelfDestructingSolverStorable8 [2022-03-20 18:46:52,336 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:52,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:52,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1745318674, now seen corresponding path program 1 times [2022-03-20 18:46:52,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:52,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1719479390] [2022-03-20 18:46:52,460 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:52,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1460692051, now seen corresponding path program 1 times [2022-03-20 18:46:52,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:52,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995985319] [2022-03-20 18:46:52,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:52,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:52,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:52,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:52,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:52,498 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:52,498 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:52,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995985319] [2022-03-20 18:46:52,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995985319] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:52,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114400093] [2022-03-20 18:46:52,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:52,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:52,499 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:52,500 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) [2022-03-20 18:46:52,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:52,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 18:46:52,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:52,538 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 18:46:52,583 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:52,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:52,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:52,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114400093] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:52,631 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:52,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2022-03-20 18:46:52,642 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:52,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1719479390] [2022-03-20 18:46:52,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1719479390] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:52,643 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:52,643 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:46:52,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53905874] [2022-03-20 18:46:52,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:52,643 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:46:52,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:52,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:46:52,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:46:52,644 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:52,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:52,747 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-03-20 18:46:52,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:46:52,748 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-20 18:46:52,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:52,748 INFO L225 Difference]: With dead ends: 38 [2022-03-20 18:46:52,748 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 18:46:52,749 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:46:52,749 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:52,749 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 33 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:52,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 18:46:52,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2022-03-20 18:46:52,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 24 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:52,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2022-03-20 18:46:52,755 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 20 [2022-03-20 18:46:52,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:52,755 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2022-03-20 18:46:52,755 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:52,756 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2022-03-20 18:46:52,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:46:52,756 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:52,756 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:52,777 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:52,970 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:52,970 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:52,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:52,971 INFO L85 PathProgramCache]: Analyzing trace with hash -1695200847, now seen corresponding path program 1 times [2022-03-20 18:46:52,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:52,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [79969896] [2022-03-20 18:46:53,097 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:53,097 INFO L85 PathProgramCache]: Analyzing trace with hash 75294800, now seen corresponding path program 1 times [2022-03-20 18:46:53,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:53,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173355797] [2022-03-20 18:46:53,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:53,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:53,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:53,349 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:53,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:53,353 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:53,354 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:53,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173355797] [2022-03-20 18:46:53,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173355797] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:53,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668512744] [2022-03-20 18:46:53,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:53,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:53,354 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:53,355 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) [2022-03-20 18:46:53,356 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 18:46:53,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:53,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 18:46:53,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:53,802 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:53,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:55,168 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:55,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668512744] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:55,169 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:55,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 29 [2022-03-20 18:46:55,270 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:55,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [79969896] [2022-03-20 18:46:55,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [79969896] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:55,271 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:55,271 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:46:55,271 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140550082] [2022-03-20 18:46:55,271 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:55,271 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:46:55,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:55,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:46:55,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=769, Unknown=0, NotChecked=0, Total=930 [2022-03-20 18:46:55,272 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:55,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:55,757 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-03-20 18:46:55,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:46:55,758 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-20 18:46:55,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:55,758 INFO L225 Difference]: With dead ends: 47 [2022-03-20 18:46:55,758 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 18:46:55,759 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=267, Invalid=1373, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 18:46:55,760 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 31 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:55,760 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 55 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:46:55,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 18:46:55,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2022-03-20 18:46:55,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 28 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:55,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-03-20 18:46:55,767 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 21 [2022-03-20 18:46:55,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:55,768 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-03-20 18:46:55,768 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:55,768 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-03-20 18:46:55,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:46:55,768 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:55,768 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:55,788 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:55,979 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:55,980 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:55,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:55,980 INFO L85 PathProgramCache]: Analyzing trace with hash -794011953, now seen corresponding path program 2 times [2022-03-20 18:46:55,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:55,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [849128595] [2022-03-20 18:46:56,091 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:56,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1314497234, now seen corresponding path program 1 times [2022-03-20 18:46:56,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:56,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822217987] [2022-03-20 18:46:56,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:56,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:56,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:56,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:56,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:56,178 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:56,178 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:56,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822217987] [2022-03-20 18:46:56,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822217987] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:56,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396175322] [2022-03-20 18:46:56,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:56,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:56,179 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:56,180 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) [2022-03-20 18:46:56,186 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 18:46:56,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:56,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 18:46:56,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:56,267 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:56,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:56,347 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:56,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396175322] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:56,347 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:56,347 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2022-03-20 18:46:56,363 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:56,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [849128595] [2022-03-20 18:46:56,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [849128595] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:56,363 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:56,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:46:56,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008373561] [2022-03-20 18:46:56,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:56,364 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:46:56,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:56,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:46:56,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:46:56,364 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:56,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:56,537 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-03-20 18:46:56,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:46:56,537 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-20 18:46:56,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:56,538 INFO L225 Difference]: With dead ends: 50 [2022-03-20 18:46:56,538 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 18:46:56,538 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:46:56,538 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:56,539 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 42 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:56,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 18:46:56,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 29. [2022-03-20 18:46:56,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:56,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-03-20 18:46:56,545 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 21 [2022-03-20 18:46:56,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:56,545 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-03-20 18:46:56,545 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:56,545 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-03-20 18:46:56,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:46:56,546 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:56,546 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:56,565 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:56,746 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-20 18:46:56,746 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:56,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:56,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1058899791, now seen corresponding path program 1 times [2022-03-20 18:46:56,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:56,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1082577918] [2022-03-20 18:46:56,839 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:56,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1752566418, now seen corresponding path program 1 times [2022-03-20 18:46:56,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:56,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082306582] [2022-03-20 18:46:56,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:56,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:56,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:56,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:56,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:56,897 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:56,897 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:56,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082306582] [2022-03-20 18:46:56,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082306582] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:56,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690086808] [2022-03-20 18:46:56,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:56,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:56,897 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:56,898 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) [2022-03-20 18:46:56,900 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 18:46:56,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:56,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:46:56,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:56,976 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:56,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:57,048 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:57,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690086808] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:57,048 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:57,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-20 18:46:57,063 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:57,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1082577918] [2022-03-20 18:46:57,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1082577918] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:57,063 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:57,063 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:46:57,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743257552] [2022-03-20 18:46:57,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:57,063 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:46:57,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:57,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:46:57,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:46:57,064 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:57,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:57,228 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2022-03-20 18:46:57,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:46:57,228 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-20 18:46:57,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:57,229 INFO L225 Difference]: With dead ends: 43 [2022-03-20 18:46:57,229 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 18:46:57,229 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:46:57,230 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 30 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:57,230 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 43 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:57,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 18:46:57,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2022-03-20 18:46:57,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:57,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-03-20 18:46:57,237 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 21 [2022-03-20 18:46:57,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:57,237 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-03-20 18:46:57,237 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:57,237 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-03-20 18:46:57,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:46:57,237 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:57,237 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:57,256 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-03-20 18:46:57,451 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:57,451 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:57,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:57,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1295231697, now seen corresponding path program 2 times [2022-03-20 18:46:57,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:57,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [378236609] [2022-03-20 18:46:57,530 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:57,530 INFO L85 PathProgramCache]: Analyzing trace with hash -2102711538, now seen corresponding path program 1 times [2022-03-20 18:46:57,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:57,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293332159] [2022-03-20 18:46:57,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:57,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:57,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:57,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:57,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:57,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:46:57,605 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:57,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293332159] [2022-03-20 18:46:57,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293332159] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:57,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041587633] [2022-03-20 18:46:57,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:57,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:57,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:57,607 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) [2022-03-20 18:46:57,622 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 18:46:57,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:57,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 18:46:57,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:57,695 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:57,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:57,726 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:57,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041587633] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:57,727 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:57,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 11 [2022-03-20 18:46:57,785 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:57,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [378236609] [2022-03-20 18:46:57,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [378236609] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:57,785 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:57,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:46:57,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155518013] [2022-03-20 18:46:57,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:57,786 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:46:57,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:57,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:46:57,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:46:57,786 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:58,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:58,075 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2022-03-20 18:46:58,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:46:58,076 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-20 18:46:58,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:58,076 INFO L225 Difference]: With dead ends: 47 [2022-03-20 18:46:58,076 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 18:46:58,077 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:46:58,078 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 33 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:58,078 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 46 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:58,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 18:46:58,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2022-03-20 18:46:58,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 29 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:58,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2022-03-20 18:46:58,091 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 21 [2022-03-20 18:46:58,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:58,091 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2022-03-20 18:46:58,092 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:58,092 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2022-03-20 18:46:58,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:46:58,092 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:58,092 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:58,109 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:58,305 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:58,305 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:58,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:58,306 INFO L85 PathProgramCache]: Analyzing trace with hash -977123598, now seen corresponding path program 2 times [2022-03-20 18:46:58,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:58,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2145975032] [2022-03-20 18:46:58,432 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:58,433 INFO L85 PathProgramCache]: Analyzing trace with hash 1754840371, now seen corresponding path program 1 times [2022-03-20 18:46:58,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:58,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1296914313] [2022-03-20 18:46:58,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:58,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:58,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:58,476 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:58,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:58,480 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:46:58,481 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:58,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1296914313] [2022-03-20 18:46:58,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1296914313] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:58,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206598523] [2022-03-20 18:46:58,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:58,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:58,481 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:58,482 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) [2022-03-20 18:46:58,483 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 18:46:58,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:58,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:46:58,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:58,565 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:58,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:58,648 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:58,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206598523] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:58,649 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:58,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 11 [2022-03-20 18:46:58,665 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:58,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2145975032] [2022-03-20 18:46:58,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2145975032] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:58,665 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:58,665 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:46:58,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057677734] [2022-03-20 18:46:58,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:58,665 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:46:58,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:58,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:46:58,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:46:58,666 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:58,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:58,781 INFO L93 Difference]: Finished difference Result 43 states and 53 transitions. [2022-03-20 18:46:58,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:46:58,782 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:46:58,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:58,782 INFO L225 Difference]: With dead ends: 43 [2022-03-20 18:46:58,782 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 18:46:58,782 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:46:58,783 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:58,783 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 33 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:58,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 18:46:58,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2022-03-20 18:46:58,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:58,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2022-03-20 18:46:58,792 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 22 [2022-03-20 18:46:58,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:58,792 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2022-03-20 18:46:58,793 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:58,793 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-03-20 18:46:58,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:46:58,793 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:58,793 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:58,813 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:59,003 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,SelfDestructingSolverStorable14 [2022-03-20 18:46:59,004 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:59,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:59,004 INFO L85 PathProgramCache]: Analyzing trace with hash -60153437, now seen corresponding path program 3 times [2022-03-20 18:46:59,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:59,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1612818622] [2022-03-20 18:46:59,116 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:59,116 INFO L85 PathProgramCache]: Analyzing trace with hash 370878500, now seen corresponding path program 1 times [2022-03-20 18:46:59,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:59,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900774203] [2022-03-20 18:46:59,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:59,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:59,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:59,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:59,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:59,221 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:59,221 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:59,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900774203] [2022-03-20 18:46:59,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900774203] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:59,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211332134] [2022-03-20 18:46:59,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:59,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:59,222 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:59,223 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) [2022-03-20 18:46:59,224 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 18:46:59,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:59,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 18:46:59,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:59,308 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:59,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:59,343 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:59,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211332134] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:59,343 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:59,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5] total 13 [2022-03-20 18:46:59,395 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:59,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1612818622] [2022-03-20 18:46:59,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1612818622] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:59,396 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:59,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:46:59,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887285674] [2022-03-20 18:46:59,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:59,396 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:46:59,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:59,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:46:59,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:46:59,397 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:59,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:59,677 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2022-03-20 18:46:59,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:46:59,678 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:46:59,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:59,678 INFO L225 Difference]: With dead ends: 42 [2022-03-20 18:46:59,678 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 18:46:59,678 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:46:59,679 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 27 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:59,679 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 50 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:59,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 18:46:59,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2022-03-20 18:46:59,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:59,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-03-20 18:46:59,686 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 22 [2022-03-20 18:46:59,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:59,686 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-03-20 18:46:59,686 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:59,686 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-03-20 18:46:59,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:46:59,686 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:59,686 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:59,709 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:59,902 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,SelfDestructingSolverStorable15 [2022-03-20 18:46:59,902 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:59,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:59,903 INFO L85 PathProgramCache]: Analyzing trace with hash -427433041, now seen corresponding path program 4 times [2022-03-20 18:46:59,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:59,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1571975298] [2022-03-20 18:47:00,039 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:00,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1735206158, now seen corresponding path program 1 times [2022-03-20 18:47:00,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:00,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230993255] [2022-03-20 18:47:00,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:00,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:00,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:00,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:00,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:00,104 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:00,105 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:00,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230993255] [2022-03-20 18:47:00,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230993255] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:00,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843149394] [2022-03-20 18:47:00,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:00,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:00,105 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:00,106 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) [2022-03-20 18:47:00,108 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 18:47:00,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:00,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 18:47:00,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:00,210 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:00,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:00,259 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:00,260 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843149394] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:00,260 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:00,260 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 9 [2022-03-20 18:47:00,276 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:00,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1571975298] [2022-03-20 18:47:00,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1571975298] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:00,276 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:00,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:47:00,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791886827] [2022-03-20 18:47:00,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:00,276 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:47:00,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:00,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:47:00,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:47:00,277 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:00,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:00,433 INFO L93 Difference]: Finished difference Result 52 states and 69 transitions. [2022-03-20 18:47:00,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:47:00,434 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-20 18:47:00,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:00,434 INFO L225 Difference]: With dead ends: 52 [2022-03-20 18:47:00,434 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 18:47:00,434 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:47:00,435 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 29 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:00,435 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 32 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:47:00,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 18:47:00,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2022-03-20 18:47:00,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.3714285714285714) internal successors, (48), 35 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:00,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2022-03-20 18:47:00,444 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 23 [2022-03-20 18:47:00,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:00,444 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2022-03-20 18:47:00,444 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:00,444 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2022-03-20 18:47:00,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 18:47:00,444 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:00,444 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:00,461 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-03-20 18:47:00,653 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,SelfDestructingSolverStorable16 [2022-03-20 18:47:00,654 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:00,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:00,654 INFO L85 PathProgramCache]: Analyzing trace with hash -1594121644, now seen corresponding path program 5 times [2022-03-20 18:47:00,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:00,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2055273579] [2022-03-20 18:47:00,732 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:00,732 INFO L85 PathProgramCache]: Analyzing trace with hash 1735658773, now seen corresponding path program 1 times [2022-03-20 18:47:00,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:00,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850782332] [2022-03-20 18:47:00,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:00,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:00,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:00,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:00,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:00,807 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:00,807 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:00,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850782332] [2022-03-20 18:47:00,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850782332] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:00,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089329895] [2022-03-20 18:47:00,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:00,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:00,807 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:00,808 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) [2022-03-20 18:47:00,809 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 18:47:00,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:00,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:47:00,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:00,903 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:00,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:01,027 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:01,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2089329895] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:01,027 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:01,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2022-03-20 18:47:01,050 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:01,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2055273579] [2022-03-20 18:47:01,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2055273579] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:01,051 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:01,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:47:01,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457827416] [2022-03-20 18:47:01,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:01,051 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:47:01,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:01,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:47:01,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:47:01,052 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:01,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:01,358 INFO L93 Difference]: Finished difference Result 90 states and 122 transitions. [2022-03-20 18:47:01,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:47:01,359 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-20 18:47:01,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:01,359 INFO L225 Difference]: With dead ends: 90 [2022-03-20 18:47:01,359 INFO L226 Difference]: Without dead ends: 58 [2022-03-20 18:47:01,360 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 53 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2022-03-20 18:47:01,360 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 40 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:01,360 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 51 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:47:01,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-20 18:47:01,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 39. [2022-03-20 18:47:01,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.3235294117647058) internal successors, (45), 34 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:01,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 49 transitions. [2022-03-20 18:47:01,369 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 49 transitions. Word has length 24 [2022-03-20 18:47:01,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:01,369 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 49 transitions. [2022-03-20 18:47:01,369 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:01,369 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 49 transitions. [2022-03-20 18:47:01,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 18:47:01,371 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:01,371 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:01,388 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-20 18:47:01,575 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,SelfDestructingSolverStorable17 [2022-03-20 18:47:01,575 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:01,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:01,576 INFO L85 PathProgramCache]: Analyzing trace with hash -294389697, now seen corresponding path program 6 times [2022-03-20 18:47:01,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:01,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [691508046] [2022-03-20 18:47:01,663 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:01,664 INFO L85 PathProgramCache]: Analyzing trace with hash -318387405, now seen corresponding path program 1 times [2022-03-20 18:47:01,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:01,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962261207] [2022-03-20 18:47:01,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:01,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:01,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:01,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:01,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:01,792 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:01,792 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:01,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962261207] [2022-03-20 18:47:01,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962261207] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:01,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047680130] [2022-03-20 18:47:01,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:01,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:01,793 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:01,794 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) [2022-03-20 18:47:01,795 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 18:47:01,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:01,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 18:47:01,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:01,946 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:47:01,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:02,040 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:47:02,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047680130] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:02,040 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:02,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 6] total 20 [2022-03-20 18:47:02,162 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:02,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [691508046] [2022-03-20 18:47:02,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [691508046] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:02,163 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:02,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:47:02,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068611776] [2022-03-20 18:47:02,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:02,163 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:47:02,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:02,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:47:02,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:47:02,164 INFO L87 Difference]: Start difference. First operand 39 states and 49 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:02,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:02,936 INFO L93 Difference]: Finished difference Result 76 states and 105 transitions. [2022-03-20 18:47:02,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:47:02,937 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-20 18:47:02,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:02,937 INFO L225 Difference]: With dead ends: 76 [2022-03-20 18:47:02,937 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 18:47:02,938 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=196, Invalid=1286, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 18:47:02,938 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 52 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:02,938 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 58 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:47:02,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 18:47:02,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 52. [2022-03-20 18:47:02,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.3191489361702127) internal successors, (62), 47 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:02,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2022-03-20 18:47:02,954 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 25 [2022-03-20 18:47:02,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:02,954 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2022-03-20 18:47:02,954 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:02,954 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2022-03-20 18:47:02,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 18:47:02,955 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:02,955 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:02,975 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:03,172 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:03,173 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:03,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:03,173 INFO L85 PathProgramCache]: Analyzing trace with hash -137630238, now seen corresponding path program 3 times [2022-03-20 18:47:03,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:03,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2036542043] [2022-03-20 18:47:03,286 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:03,287 INFO L85 PathProgramCache]: Analyzing trace with hash -269680338, now seen corresponding path program 1 times [2022-03-20 18:47:03,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:03,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301721835] [2022-03-20 18:47:03,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:03,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:03,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:03,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:03,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:03,671 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:47:03,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:03,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301721835] [2022-03-20 18:47:03,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301721835] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:03,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540857098] [2022-03-20 18:47:03,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:03,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:03,672 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:03,673 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) [2022-03-20 18:47:03,674 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 18:47:03,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:03,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 18:47:03,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:04,464 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:04,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:06,648 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:06,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540857098] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:06,648 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:06,648 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 18] total 44 [2022-03-20 18:47:06,936 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:06,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2036542043] [2022-03-20 18:47:06,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2036542043] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:06,936 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:06,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:47:06,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983488501] [2022-03-20 18:47:06,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:06,937 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:47:06,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:06,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:47:06,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=1822, Unknown=0, NotChecked=0, Total=2162 [2022-03-20 18:47:06,938 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:08,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:08,136 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2022-03-20 18:47:08,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 18:47:08,136 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-20 18:47:08,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:08,137 INFO L225 Difference]: With dead ends: 79 [2022-03-20 18:47:08,137 INFO L226 Difference]: Without dead ends: 68 [2022-03-20 18:47:08,138 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=522, Invalid=3138, Unknown=0, NotChecked=0, Total=3660 [2022-03-20 18:47:08,138 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 29 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:08,139 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 72 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:47:08,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-20 18:47:08,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 56. [2022-03-20 18:47:08,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.2941176470588236) internal successors, (66), 51 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:08,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2022-03-20 18:47:08,179 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 26 [2022-03-20 18:47:08,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:08,179 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2022-03-20 18:47:08,179 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:08,179 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2022-03-20 18:47:08,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:47:08,179 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:08,179 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:08,198 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:08,389 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,SelfDestructingSolverStorable19 [2022-03-20 18:47:08,389 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:08,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:08,390 INFO L85 PathProgramCache]: Analyzing trace with hash 62925025, now seen corresponding path program 4 times [2022-03-20 18:47:08,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:08,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [720716273] [2022-03-20 18:47:08,499 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:08,499 INFO L85 PathProgramCache]: Analyzing trace with hash 2052714325, now seen corresponding path program 1 times [2022-03-20 18:47:08,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:08,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155454228] [2022-03-20 18:47:08,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:08,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:08,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:08,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:08,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:08,554 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:08,554 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:08,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155454228] [2022-03-20 18:47:08,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155454228] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:08,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499041205] [2022-03-20 18:47:08,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:08,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:08,555 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:08,556 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) [2022-03-20 18:47:08,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 18:47:08,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:08,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:47:08,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:08,659 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:08,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:08,824 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:08,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499041205] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:08,824 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:08,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 10] total 15 [2022-03-20 18:47:08,871 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:08,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [720716273] [2022-03-20 18:47:08,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [720716273] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:08,871 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:08,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:47:08,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885503467] [2022-03-20 18:47:08,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:08,872 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:47:08,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:08,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:47:08,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:47:08,872 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:09,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:09,191 INFO L93 Difference]: Finished difference Result 70 states and 87 transitions. [2022-03-20 18:47:09,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:47:09,192 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-20 18:47:09,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:09,192 INFO L225 Difference]: With dead ends: 70 [2022-03-20 18:47:09,192 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 18:47:09,193 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=584, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:47:09,193 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 33 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:09,193 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 38 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:47:09,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 18:47:09,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2022-03-20 18:47:09,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.2826086956521738) internal successors, (59), 46 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:09,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2022-03-20 18:47:09,211 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 27 [2022-03-20 18:47:09,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:09,211 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2022-03-20 18:47:09,211 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:09,212 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2022-03-20 18:47:09,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:47:09,212 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:09,212 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] [2022-03-20 18:47:09,229 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:09,419 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:09,419 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:09,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:09,420 INFO L85 PathProgramCache]: Analyzing trace with hash -690945345, now seen corresponding path program 7 times [2022-03-20 18:47:09,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:09,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [75728931] [2022-03-20 18:47:09,529 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:09,530 INFO L85 PathProgramCache]: Analyzing trace with hash -1207748237, now seen corresponding path program 1 times [2022-03-20 18:47:09,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:09,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288343895] [2022-03-20 18:47:09,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:09,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:09,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:09,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:09,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:09,606 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:09,606 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:09,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288343895] [2022-03-20 18:47:09,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288343895] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:09,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045755898] [2022-03-20 18:47:09,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:09,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:09,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:09,607 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) [2022-03-20 18:47:09,608 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 18:47:09,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:09,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:47:09,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:09,728 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:09,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:09,784 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:09,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045755898] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:09,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:09,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 12 [2022-03-20 18:47:09,828 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:09,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [75728931] [2022-03-20 18:47:09,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [75728931] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:09,828 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:09,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:47:09,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434656911] [2022-03-20 18:47:09,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:09,829 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:47:09,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:09,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:47:09,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:47:09,829 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:10,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:10,268 INFO L93 Difference]: Finished difference Result 77 states and 100 transitions. [2022-03-20 18:47:10,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:47:10,270 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-20 18:47:10,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:10,271 INFO L225 Difference]: With dead ends: 77 [2022-03-20 18:47:10,271 INFO L226 Difference]: Without dead ends: 72 [2022-03-20 18:47:10,271 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=174, Invalid=638, Unknown=0, NotChecked=0, Total=812 [2022-03-20 18:47:10,271 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 47 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:10,272 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 35 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:47:10,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-20 18:47:10,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2022-03-20 18:47:10,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.280701754385965) internal successors, (73), 57 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:10,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 77 transitions. [2022-03-20 18:47:10,294 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 77 transitions. Word has length 27 [2022-03-20 18:47:10,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:10,294 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 77 transitions. [2022-03-20 18:47:10,294 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:10,294 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 77 transitions. [2022-03-20 18:47:10,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 18:47:10,295 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:10,295 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:10,311 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:10,495 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:10,495 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:10,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:10,496 INFO L85 PathProgramCache]: Analyzing trace with hash 1703289154, now seen corresponding path program 5 times [2022-03-20 18:47:10,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:10,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2086179493] [2022-03-20 18:47:10,609 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:10,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1827645234, now seen corresponding path program 1 times [2022-03-20 18:47:10,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:10,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505540938] [2022-03-20 18:47:10,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:10,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:10,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:10,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:10,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:10,685 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 18:47:10,685 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:10,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505540938] [2022-03-20 18:47:10,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505540938] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:10,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2117337840] [2022-03-20 18:47:10,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:10,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:10,686 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:10,687 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) [2022-03-20 18:47:10,692 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 18:47:10,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:10,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:47:10,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:10,787 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 18:47:10,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:10,908 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 18:47:10,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2117337840] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:10,909 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:10,909 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2022-03-20 18:47:10,951 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:10,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2086179493] [2022-03-20 18:47:10,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2086179493] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:10,951 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:10,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:47:10,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572671140] [2022-03-20 18:47:10,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:10,952 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:47:10,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:10,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:47:10,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:47:10,952 INFO L87 Difference]: Start difference. First operand 62 states and 77 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:11,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:11,297 INFO L93 Difference]: Finished difference Result 71 states and 87 transitions. [2022-03-20 18:47:11,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:47:11,298 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-20 18:47:11,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:11,298 INFO L225 Difference]: With dead ends: 71 [2022-03-20 18:47:11,298 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 18:47:11,299 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 61 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:47:11,299 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 29 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:11,299 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 52 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:47:11,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 18:47:11,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2022-03-20 18:47:11,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.2826086956521738) internal successors, (59), 46 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:11,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2022-03-20 18:47:11,317 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 28 [2022-03-20 18:47:11,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:11,317 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2022-03-20 18:47:11,317 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:11,317 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2022-03-20 18:47:11,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 18:47:11,317 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:11,318 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:11,334 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:11,532 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-03-20 18:47:11,532 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:11,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:11,533 INFO L85 PathProgramCache]: Analyzing trace with hash 453627138, now seen corresponding path program 8 times [2022-03-20 18:47:11,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:11,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1342024845] [2022-03-20 18:47:11,613 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:11,613 INFO L85 PathProgramCache]: Analyzing trace with hash 822713422, now seen corresponding path program 1 times [2022-03-20 18:47:11,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:11,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055528108] [2022-03-20 18:47:11,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:11,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:11,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:11,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:11,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:11,749 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:11,749 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:11,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055528108] [2022-03-20 18:47:11,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055528108] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:11,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146838173] [2022-03-20 18:47:11,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:11,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:11,749 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:11,750 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:11,752 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 18:47:11,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:11,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 18:47:11,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:11,870 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:11,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:12,037 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:12,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146838173] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:12,038 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:12,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2022-03-20 18:47:12,097 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:12,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1342024845] [2022-03-20 18:47:12,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1342024845] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:12,097 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:12,097 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:47:12,097 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963110362] [2022-03-20 18:47:12,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:12,097 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:47:12,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:12,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:47:12,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:47:12,098 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:12,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:12,692 INFO L93 Difference]: Finished difference Result 101 states and 128 transitions. [2022-03-20 18:47:12,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 18:47:12,692 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-20 18:47:12,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:12,693 INFO L225 Difference]: With dead ends: 101 [2022-03-20 18:47:12,693 INFO L226 Difference]: Without dead ends: 59 [2022-03-20 18:47:12,693 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=179, Invalid=1011, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 18:47:12,694 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 38 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:12,694 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 63 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:47:12,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-20 18:47:12,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2022-03-20 18:47:12,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.2619047619047619) internal successors, (53), 42 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:12,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 57 transitions. [2022-03-20 18:47:12,713 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 57 transitions. Word has length 28 [2022-03-20 18:47:12,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:12,713 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 57 transitions. [2022-03-20 18:47:12,713 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:12,713 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 57 transitions. [2022-03-20 18:47:12,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:47:12,715 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:12,715 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:12,731 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:12,927 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:12,928 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:12,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:12,928 INFO L85 PathProgramCache]: Analyzing trace with hash -1646269137, now seen corresponding path program 9 times [2022-03-20 18:47:12,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:12,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [499971192] [2022-03-20 18:47:13,037 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:13,038 INFO L85 PathProgramCache]: Analyzing trace with hash -1240724818, now seen corresponding path program 1 times [2022-03-20 18:47:13,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:13,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952732377] [2022-03-20 18:47:13,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:13,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:13,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:13,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:13,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:13,181 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:47:13,181 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:13,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952732377] [2022-03-20 18:47:13,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952732377] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:13,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807556341] [2022-03-20 18:47:13,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:13,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:13,182 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:13,183 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:13,184 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 18:47:13,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:13,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:47:13,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:13,331 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:13,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:13,380 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:13,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807556341] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:13,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:13,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 17 [2022-03-20 18:47:13,619 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:13,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [499971192] [2022-03-20 18:47:13,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [499971192] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:13,619 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:13,620 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:47:13,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313560626] [2022-03-20 18:47:13,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:13,620 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:47:13,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:13,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:47:13,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:47:13,620 INFO L87 Difference]: Start difference. First operand 47 states and 57 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:15,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:15,041 INFO L93 Difference]: Finished difference Result 104 states and 138 transitions. [2022-03-20 18:47:15,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 18:47:15,041 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-20 18:47:15,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:15,042 INFO L225 Difference]: With dead ends: 104 [2022-03-20 18:47:15,042 INFO L226 Difference]: Without dead ends: 91 [2022-03-20 18:47:15,043 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=309, Invalid=1583, Unknown=0, NotChecked=0, Total=1892 [2022-03-20 18:47:15,043 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 67 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:15,043 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 65 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:47:15,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-20 18:47:15,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 59. [2022-03-20 18:47:15,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 54 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:15,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 72 transitions. [2022-03-20 18:47:15,065 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 72 transitions. Word has length 29 [2022-03-20 18:47:15,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:15,065 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 72 transitions. [2022-03-20 18:47:15,065 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:15,065 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 72 transitions. [2022-03-20 18:47:15,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 18:47:15,066 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:15,066 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:15,082 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:15,266 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:15,266 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:15,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:15,267 INFO L85 PathProgramCache]: Analyzing trace with hash 274096195, now seen corresponding path program 10 times [2022-03-20 18:47:15,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:15,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1758043416] [2022-03-20 18:47:15,424 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:15,425 INFO L85 PathProgramCache]: Analyzing trace with hash 602624740, now seen corresponding path program 1 times [2022-03-20 18:47:15,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:15,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744485834] [2022-03-20 18:47:15,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:15,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:15,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:15,564 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:15,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:15,578 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:15,579 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:15,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744485834] [2022-03-20 18:47:15,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744485834] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:15,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628158825] [2022-03-20 18:47:15,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:15,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:15,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:15,580 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:15,583 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 18:47:15,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:15,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:47:15,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:15,722 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:15,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:15,964 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:15,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628158825] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:15,964 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:15,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2022-03-20 18:47:16,114 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:16,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1758043416] [2022-03-20 18:47:16,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1758043416] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:16,115 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:16,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:47:16,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398661745] [2022-03-20 18:47:16,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:16,115 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:47:16,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:16,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:47:16,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=368, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:47:16,116 INFO L87 Difference]: Start difference. First operand 59 states and 72 transitions. Second operand has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:18,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:18,257 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2022-03-20 18:47:18,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-20 18:47:18,257 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2022-03-20 18:47:18,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:18,258 INFO L225 Difference]: With dead ends: 116 [2022-03-20 18:47:18,258 INFO L226 Difference]: Without dead ends: 83 [2022-03-20 18:47:18,259 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=491, Invalid=2371, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 18:47:18,259 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 74 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:18,259 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 81 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:47:18,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-03-20 18:47:18,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 63. [2022-03-20 18:47:18,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.2241379310344827) internal successors, (71), 58 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:18,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2022-03-20 18:47:18,292 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 30 [2022-03-20 18:47:18,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:18,293 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2022-03-20 18:47:18,293 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:18,293 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2022-03-20 18:47:18,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:47:18,293 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:18,293 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:18,312 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:18,510 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:18,510 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:18,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:18,511 INFO L85 PathProgramCache]: Analyzing trace with hash -543637167, now seen corresponding path program 6 times [2022-03-20 18:47:18,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:18,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [60683188] [2022-03-20 18:47:18,624 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:18,624 INFO L85 PathProgramCache]: Analyzing trace with hash -535770480, now seen corresponding path program 1 times [2022-03-20 18:47:18,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:18,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937633606] [2022-03-20 18:47:18,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:18,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:18,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:19,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:19,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:19,176 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:47:19,176 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:19,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937633606] [2022-03-20 18:47:19,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937633606] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:19,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87107876] [2022-03-20 18:47:19,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:19,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:19,177 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:19,178 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:19,181 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 18:47:19,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:19,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 18:47:19,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:20,906 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:20,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:24,720 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:24,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87107876] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:24,721 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:24,721 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 22, 22] total 54 [2022-03-20 18:47:25,658 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:25,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [60683188] [2022-03-20 18:47:25,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [60683188] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:25,659 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:25,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:47:25,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521215494] [2022-03-20 18:47:25,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:25,660 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:47:25,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:25,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:47:25,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=2846, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 18:47:25,661 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand has 20 states, 20 states have (on average 1.3) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:27,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:27,972 INFO L93 Difference]: Finished difference Result 81 states and 98 transitions. [2022-03-20 18:47:27,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:47:27,972 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.3) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-20 18:47:27,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:27,973 INFO L225 Difference]: With dead ends: 81 [2022-03-20 18:47:27,973 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 18:47:27,974 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1323 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=691, Invalid=4711, Unknown=0, NotChecked=0, Total=5402 [2022-03-20 18:47:27,974 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 30 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:27,974 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 94 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:47:27,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 18:47:28,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2022-03-20 18:47:28,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.2295081967213115) internal successors, (75), 61 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:28,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 79 transitions. [2022-03-20 18:47:28,005 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 79 transitions. Word has length 31 [2022-03-20 18:47:28,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:28,005 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 79 transitions. [2022-03-20 18:47:28,005 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.3) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:28,005 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 79 transitions. [2022-03-20 18:47:28,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:47:28,005 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:28,005 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:28,016 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:28,209 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-20 18:47:28,210 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:28,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:28,210 INFO L85 PathProgramCache]: Analyzing trace with hash 361612114, now seen corresponding path program 7 times [2022-03-20 18:47:28,210 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:28,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1912826800] [2022-03-20 18:47:28,323 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:28,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1333972429, now seen corresponding path program 1 times [2022-03-20 18:47:28,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:28,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294748060] [2022-03-20 18:47:28,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:28,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:28,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:28,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:28,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:28,398 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:47:28,398 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:28,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294748060] [2022-03-20 18:47:28,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294748060] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:28,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438550917] [2022-03-20 18:47:28,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:28,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:28,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:28,400 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:28,401 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 18:47:28,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:28,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:47:28,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:28,583 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:28,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:28,881 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:28,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438550917] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:28,881 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:28,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 13] total 20 [2022-03-20 18:47:29,087 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:29,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1912826800] [2022-03-20 18:47:29,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1912826800] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:29,088 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:29,088 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:47:29,088 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053502980] [2022-03-20 18:47:29,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:29,088 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:47:29,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:29,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:47:29,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:47:29,089 INFO L87 Difference]: Start difference. First operand 66 states and 79 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:29,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:29,983 INFO L93 Difference]: Finished difference Result 79 states and 95 transitions. [2022-03-20 18:47:29,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:47:29,984 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-20 18:47:29,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:29,984 INFO L225 Difference]: With dead ends: 79 [2022-03-20 18:47:29,984 INFO L226 Difference]: Without dead ends: 61 [2022-03-20 18:47:29,985 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=190, Invalid=1216, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:47:29,985 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:29,985 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 48 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:47:29,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-20 18:47:30,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55. [2022-03-20 18:47:30,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.24) internal successors, (62), 50 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:30,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-03-20 18:47:30,009 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 32 [2022-03-20 18:47:30,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:30,009 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-03-20 18:47:30,009 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:30,009 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-03-20 18:47:30,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:47:30,009 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:30,009 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:30,026 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:30,209 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-03-20 18:47:30,210 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:30,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:30,210 INFO L85 PathProgramCache]: Analyzing trace with hash -876076878, now seen corresponding path program 11 times [2022-03-20 18:47:30,210 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:30,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [707074447] [2022-03-20 18:47:30,289 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:30,289 INFO L85 PathProgramCache]: Analyzing trace with hash -216145965, now seen corresponding path program 1 times [2022-03-20 18:47:30,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:30,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010405349] [2022-03-20 18:47:30,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:30,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:30,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:30,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:30,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:30,448 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:47:30,448 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:30,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010405349] [2022-03-20 18:47:30,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010405349] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:30,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140818917] [2022-03-20 18:47:30,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:30,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:30,449 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:30,450 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:30,451 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 18:47:30,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:30,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 18:47:30,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:30,666 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:30,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:30,719 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:30,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140818917] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:30,720 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:30,720 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 17 [2022-03-20 18:47:30,918 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:30,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [707074447] [2022-03-20 18:47:30,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [707074447] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:30,918 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:30,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:47:30,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592685147] [2022-03-20 18:47:30,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:30,919 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:47:30,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:30,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:47:30,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:47:30,919 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:32,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:32,596 INFO L93 Difference]: Finished difference Result 135 states and 173 transitions. [2022-03-20 18:47:32,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:47:32,597 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-20 18:47:32,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:32,597 INFO L225 Difference]: With dead ends: 135 [2022-03-20 18:47:32,597 INFO L226 Difference]: Without dead ends: 124 [2022-03-20 18:47:32,598 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=332, Invalid=1228, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:47:32,598 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 148 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:32,598 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 48 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:47:32,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-20 18:47:32,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 67. [2022-03-20 18:47:32,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 62 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:32,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2022-03-20 18:47:32,630 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 32 [2022-03-20 18:47:32,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:32,630 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2022-03-20 18:47:32,630 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:32,630 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2022-03-20 18:47:32,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:47:32,630 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:32,630 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:32,646 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:32,831 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-03-20 18:47:32,831 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:32,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:32,831 INFO L85 PathProgramCache]: Analyzing trace with hash 93956866, now seen corresponding path program 12 times [2022-03-20 18:47:32,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:32,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2035588800] [2022-03-20 18:47:32,942 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:32,942 INFO L85 PathProgramCache]: Analyzing trace with hash 1071086638, now seen corresponding path program 1 times [2022-03-20 18:47:32,942 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:32,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410017288] [2022-03-20 18:47:32,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:32,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:32,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:33,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:33,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:33,069 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:47:33,069 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:33,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410017288] [2022-03-20 18:47:33,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410017288] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:33,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991330187] [2022-03-20 18:47:33,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:33,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:33,070 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:33,071 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:33,072 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 18:47:33,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:33,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:47:33,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:33,260 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:47:33,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:33,346 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:47:33,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991330187] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:33,347 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:33,347 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 15 [2022-03-20 18:47:33,595 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:33,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2035588800] [2022-03-20 18:47:33,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2035588800] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:33,595 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:33,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:47:33,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515178522] [2022-03-20 18:47:33,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:33,596 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:47:33,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:33,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:47:33,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:47:33,596 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:35,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:35,087 INFO L93 Difference]: Finished difference Result 90 states and 112 transitions. [2022-03-20 18:47:35,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 18:47:35,087 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-20 18:47:35,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:35,088 INFO L225 Difference]: With dead ends: 90 [2022-03-20 18:47:35,088 INFO L226 Difference]: Without dead ends: 85 [2022-03-20 18:47:35,088 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=334, Invalid=1388, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:47:35,089 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 33 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:35,089 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 57 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:47:35,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-20 18:47:35,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 76. [2022-03-20 18:47:35,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.2253521126760563) internal successors, (87), 71 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:35,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 91 transitions. [2022-03-20 18:47:35,128 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 91 transitions. Word has length 32 [2022-03-20 18:47:35,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:35,128 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 91 transitions. [2022-03-20 18:47:35,128 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:35,128 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 91 transitions. [2022-03-20 18:47:35,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 18:47:35,128 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:35,128 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:35,144 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:35,331 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:35,331 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:35,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:35,332 INFO L85 PathProgramCache]: Analyzing trace with hash 48744064, now seen corresponding path program 13 times [2022-03-20 18:47:35,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:35,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1552862438] [2022-03-20 18:47:35,445 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:35,445 INFO L85 PathProgramCache]: Analyzing trace with hash -955163905, now seen corresponding path program 1 times [2022-03-20 18:47:35,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:35,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621024447] [2022-03-20 18:47:35,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:35,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:35,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:35,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:35,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:35,664 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:47:35,664 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:35,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621024447] [2022-03-20 18:47:35,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621024447] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:35,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135076552] [2022-03-20 18:47:35,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:35,664 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:35,664 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:35,665 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:35,666 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 18:47:35,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:35,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 18:47:35,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:35,923 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:47:35,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:35,982 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:47:35,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2135076552] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:35,982 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:35,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 17 [2022-03-20 18:47:36,374 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:36,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1552862438] [2022-03-20 18:47:36,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1552862438] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:36,374 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:36,374 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:47:36,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891443180] [2022-03-20 18:47:36,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:36,374 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:47:36,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:36,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:47:36,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=369, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:47:36,375 INFO L87 Difference]: Start difference. First operand 76 states and 91 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:39,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:39,031 INFO L93 Difference]: Finished difference Result 106 states and 131 transitions. [2022-03-20 18:47:39,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-20 18:47:39,031 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-20 18:47:39,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:39,032 INFO L225 Difference]: With dead ends: 106 [2022-03-20 18:47:39,032 INFO L226 Difference]: Without dead ends: 100 [2022-03-20 18:47:39,033 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=289, Invalid=1691, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:47:39,033 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 63 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:39,033 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 70 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:47:39,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-03-20 18:47:39,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 84. [2022-03-20 18:47:39,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.2278481012658229) internal successors, (97), 79 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:39,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2022-03-20 18:47:39,087 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 33 [2022-03-20 18:47:39,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:39,088 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2022-03-20 18:47:39,088 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:39,088 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2022-03-20 18:47:39,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 18:47:39,088 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:39,088 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:39,105 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:39,291 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:39,291 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:39,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:39,292 INFO L85 PathProgramCache]: Analyzing trace with hash -236853986, now seen corresponding path program 14 times [2022-03-20 18:47:39,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:39,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1483106446] [2022-03-20 18:47:39,417 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:39,418 INFO L85 PathProgramCache]: Analyzing trace with hash -1234226851, now seen corresponding path program 1 times [2022-03-20 18:47:39,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:39,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755725527] [2022-03-20 18:47:39,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:39,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:39,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:39,645 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:39,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:39,652 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:39,653 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:39,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755725527] [2022-03-20 18:47:39,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755725527] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:39,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580237131] [2022-03-20 18:47:39,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:39,653 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:39,653 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:39,654 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:39,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 18:47:39,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:39,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:47:39,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:39,929 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:39,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:40,522 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:40,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580237131] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:40,522 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:40,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 14] total 28 [2022-03-20 18:47:40,898 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:40,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1483106446] [2022-03-20 18:47:40,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1483106446] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:40,898 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:40,898 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:47:40,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745361991] [2022-03-20 18:47:40,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:40,899 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:47:40,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:40,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:47:40,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=856, Unknown=0, NotChecked=0, Total=930 [2022-03-20 18:47:40,899 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:49,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:49,293 INFO L93 Difference]: Finished difference Result 153 states and 192 transitions. [2022-03-20 18:47:49,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-20 18:47:49,294 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-20 18:47:49,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:49,294 INFO L225 Difference]: With dead ends: 153 [2022-03-20 18:47:49,294 INFO L226 Difference]: Without dead ends: 121 [2022-03-20 18:47:49,296 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1061 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=728, Invalid=4674, Unknown=0, NotChecked=0, Total=5402 [2022-03-20 18:47:49,296 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 97 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:49,296 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 89 Invalid, 638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:47:49,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-03-20 18:47:49,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 95. [2022-03-20 18:47:49,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.2222222222222223) internal successors, (110), 90 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:49,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 114 transitions. [2022-03-20 18:47:49,354 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 114 transitions. Word has length 33 [2022-03-20 18:47:49,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:49,354 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 114 transitions. [2022-03-20 18:47:49,354 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:49,354 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 114 transitions. [2022-03-20 18:47:49,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 18:47:49,355 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:49,355 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:49,371 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-03-20 18:47:49,555 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-03-20 18:47:49,555 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:49,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:49,556 INFO L85 PathProgramCache]: Analyzing trace with hash 1645557379, now seen corresponding path program 15 times [2022-03-20 18:47:49,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:49,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [554291630] [2022-03-20 18:47:49,669 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:49,669 INFO L85 PathProgramCache]: Analyzing trace with hash 994357860, now seen corresponding path program 1 times [2022-03-20 18:47:49,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:49,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108304484] [2022-03-20 18:47:49,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:49,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:49,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:50,131 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:50,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:50,134 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:47:50,134 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:50,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108304484] [2022-03-20 18:47:50,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108304484] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:50,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397339628] [2022-03-20 18:47:50,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:50,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:50,134 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:50,135 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:50,136 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 18:47:50,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:50,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 18:47:50,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:50,651 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:50,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:50,758 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:47:50,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397339628] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:50,758 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:50,758 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 9] total 31 [2022-03-20 18:47:51,507 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:51,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [554291630] [2022-03-20 18:47:51,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [554291630] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:51,507 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:51,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 18:47:51,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675998076] [2022-03-20 18:47:51,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:51,508 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 18:47:51,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:51,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 18:47:51,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1081, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 18:47:51,508 INFO L87 Difference]: Start difference. First operand 95 states and 114 transitions. Second operand has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:57,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:57,562 INFO L93 Difference]: Finished difference Result 131 states and 159 transitions. [2022-03-20 18:47:57,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 18:47:57,562 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-20 18:47:57,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:57,563 INFO L225 Difference]: With dead ends: 131 [2022-03-20 18:47:57,563 INFO L226 Difference]: Without dead ends: 121 [2022-03-20 18:47:57,564 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 716 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=439, Invalid=3221, Unknown=0, NotChecked=0, Total=3660 [2022-03-20 18:47:57,564 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 61 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:57,564 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 69 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:47:57,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-03-20 18:47:57,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 95. [2022-03-20 18:47:57,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.211111111111111) internal successors, (109), 90 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:57,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 113 transitions. [2022-03-20 18:47:57,623 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 113 transitions. Word has length 34 [2022-03-20 18:47:57,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:57,624 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 113 transitions. [2022-03-20 18:47:57,624 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:57,624 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 113 transitions. [2022-03-20 18:47:57,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 18:47:57,624 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:57,624 INFO L499 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:57,641 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:57,824 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-03-20 18:47:57,825 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:57,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:57,825 INFO L85 PathProgramCache]: Analyzing trace with hash -1273237790, now seen corresponding path program 16 times [2022-03-20 18:47:57,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:57,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [52468012] [2022-03-20 18:47:57,940 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:57,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1471742990, now seen corresponding path program 1 times [2022-03-20 18:47:57,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:57,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662392006] [2022-03-20 18:47:57,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:57,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:57,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:58,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:58,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:58,154 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 18:47:58,154 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:58,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662392006] [2022-03-20 18:47:58,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662392006] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:58,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895066593] [2022-03-20 18:47:58,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:58,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:58,155 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:58,155 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:58,156 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 18:47:58,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:58,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 18:47:58,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:58,305 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 18:47:58,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:58,658 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 18:47:58,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895066593] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:58,658 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:58,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 19 [2022-03-20 18:47:59,309 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:59,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [52468012] [2022-03-20 18:47:59,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [52468012] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:59,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:59,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:47:59,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136571335] [2022-03-20 18:47:59,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:59,310 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:47:59,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:59,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:47:59,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:47:59,311 INFO L87 Difference]: Start difference. First operand 95 states and 113 transitions. Second operand has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:02,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:02,731 INFO L93 Difference]: Finished difference Result 151 states and 183 transitions. [2022-03-20 18:48:02,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-20 18:48:02,732 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-20 18:48:02,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:02,733 INFO L225 Difference]: With dead ends: 151 [2022-03-20 18:48:02,733 INFO L226 Difference]: Without dead ends: 101 [2022-03-20 18:48:02,734 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=317, Invalid=1939, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:48:02,734 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 49 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:02,734 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 75 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:48:02,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-20 18:48:02,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 87. [2022-03-20 18:48:02,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:02,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 102 transitions. [2022-03-20 18:48:02,785 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 102 transitions. Word has length 34 [2022-03-20 18:48:02,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:02,786 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 102 transitions. [2022-03-20 18:48:02,786 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:02,786 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 102 transitions. [2022-03-20 18:48:02,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 18:48:02,786 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:02,786 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:02,802 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:02,987 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:02,987 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:02,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:02,988 INFO L85 PathProgramCache]: Analyzing trace with hash 955015874, now seen corresponding path program 8 times [2022-03-20 18:48:02,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:02,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [453937049] [2022-03-20 18:48:03,069 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:03,069 INFO L85 PathProgramCache]: Analyzing trace with hash -538073938, now seen corresponding path program 1 times [2022-03-20 18:48:03,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:03,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455627304] [2022-03-20 18:48:03,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:03,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:03,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:03,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:03,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:03,952 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:48:03,952 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:03,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455627304] [2022-03-20 18:48:03,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1455627304] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:03,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470562338] [2022-03-20 18:48:03,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:03,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:03,953 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:03,954 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:48:03,956 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 18:48:04,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:04,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 70 conjunts are in the unsatisfiable core [2022-03-20 18:48:04,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:06,675 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:06,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:13,346 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:13,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470562338] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:13,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:13,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 25, 24] total 61 [2022-03-20 18:48:17,242 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:17,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [453937049] [2022-03-20 18:48:17,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [453937049] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:17,243 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:17,243 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 18:48:17,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915119067] [2022-03-20 18:48:17,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:17,243 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 18:48:17,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:17,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 18:48:17,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=3835, Unknown=0, NotChecked=0, Total=4290 [2022-03-20 18:48:17,244 INFO L87 Difference]: Start difference. First operand 87 states and 102 transitions. Second operand has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 21 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:25,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:25,956 INFO L93 Difference]: Finished difference Result 107 states and 128 transitions. [2022-03-20 18:48:25,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:48:25,958 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 21 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2022-03-20 18:48:25,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:25,959 INFO L225 Difference]: With dead ends: 107 [2022-03-20 18:48:25,959 INFO L226 Difference]: Without dead ends: 94 [2022-03-20 18:48:25,959 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=706, Invalid=6604, Unknown=0, NotChecked=0, Total=7310 [2022-03-20 18:48:25,960 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 29 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 736 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:25,960 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 116 Invalid, 766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 736 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:48:25,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-20 18:48:26,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2022-03-20 18:48:26,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.2) internal successors, (102), 85 states have internal predecessors, (102), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:26,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 106 transitions. [2022-03-20 18:48:26,019 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 106 transitions. Word has length 36 [2022-03-20 18:48:26,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:26,019 INFO L478 AbstractCegarLoop]: Abstraction has 90 states and 106 transitions. [2022-03-20 18:48:26,019 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 21 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:26,020 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 106 transitions. [2022-03-20 18:48:26,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 18:48:26,020 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:26,020 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:26,024 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-20 18:48:26,220 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:26,221 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:26,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:26,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1466061842, now seen corresponding path program 17 times [2022-03-20 18:48:26,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:26,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [396247765] [2022-03-20 18:48:26,352 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:26,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1390012653, now seen corresponding path program 1 times [2022-03-20 18:48:26,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:26,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733812549] [2022-03-20 18:48:26,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:26,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:26,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:26,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:26,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:26,669 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:48:26,669 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:26,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733812549] [2022-03-20 18:48:26,670 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733812549] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:26,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834900729] [2022-03-20 18:48:26,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:26,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:26,670 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:26,671 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:48:26,671 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 18:48:26,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:26,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 18:48:26,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:27,061 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:48:27,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:27,197 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:48:27,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834900729] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:27,197 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:27,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 18 [2022-03-20 18:48:28,114 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:28,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [396247765] [2022-03-20 18:48:28,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [396247765] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:28,114 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:28,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:48:28,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285168545] [2022-03-20 18:48:28,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:28,115 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:48:28,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:28,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:48:28,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:48:28,115 INFO L87 Difference]: Start difference. First operand 90 states and 106 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:34,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:34,512 INFO L93 Difference]: Finished difference Result 118 states and 144 transitions. [2022-03-20 18:48:34,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-20 18:48:34,515 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2022-03-20 18:48:34,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:34,515 INFO L225 Difference]: With dead ends: 118 [2022-03-20 18:48:34,515 INFO L226 Difference]: Without dead ends: 113 [2022-03-20 18:48:34,516 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=637, Invalid=3023, Unknown=0, NotChecked=0, Total=3660 [2022-03-20 18:48:34,516 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 53 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:34,516 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 54 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:48:34,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-03-20 18:48:34,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 92. [2022-03-20 18:48:34,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.206896551724138) internal successors, (105), 87 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:34,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 109 transitions. [2022-03-20 18:48:34,580 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 109 transitions. Word has length 36 [2022-03-20 18:48:34,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:34,580 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 109 transitions. [2022-03-20 18:48:34,580 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:34,580 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 109 transitions. [2022-03-20 18:48:34,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:48:34,580 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:34,580 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:34,597 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:34,781 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:34,781 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:34,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:34,781 INFO L85 PathProgramCache]: Analyzing trace with hash -424783871, now seen corresponding path program 9 times [2022-03-20 18:48:34,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:34,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1262042748] [2022-03-20 18:48:34,902 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:34,902 INFO L85 PathProgramCache]: Analyzing trace with hash -933385195, now seen corresponding path program 1 times [2022-03-20 18:48:34,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:34,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494736447] [2022-03-20 18:48:34,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:34,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:34,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:35,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:35,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:35,068 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 18:48:35,068 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:35,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494736447] [2022-03-20 18:48:35,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494736447] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:35,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206977680] [2022-03-20 18:48:35,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:35,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:35,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:35,070 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:48:35,070 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 18:48:35,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:35,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 18:48:35,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:35,185 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 18:48:35,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:35,268 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 18:48:35,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206977680] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:35,268 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:35,269 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 8 [2022-03-20 18:48:35,836 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:35,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1262042748] [2022-03-20 18:48:35,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1262042748] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:35,836 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:35,836 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:48:35,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677588292] [2022-03-20 18:48:35,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:35,836 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:48:35,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:35,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:48:35,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:48:35,837 INFO L87 Difference]: Start difference. First operand 92 states and 109 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:38,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:38,402 INFO L93 Difference]: Finished difference Result 116 states and 137 transitions. [2022-03-20 18:48:38,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:48:38,403 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-20 18:48:38,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:38,403 INFO L225 Difference]: With dead ends: 116 [2022-03-20 18:48:38,403 INFO L226 Difference]: Without dead ends: 95 [2022-03-20 18:48:38,404 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 81 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=194, Invalid=798, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:48:38,404 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 37 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:38,404 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 48 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:48:38,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-20 18:48:38,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 87. [2022-03-20 18:48:38,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:38,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 102 transitions. [2022-03-20 18:48:38,470 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 102 transitions. Word has length 37 [2022-03-20 18:48:38,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:38,470 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 102 transitions. [2022-03-20 18:48:38,470 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:38,470 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 102 transitions. [2022-03-20 18:48:38,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:48:38,470 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:38,470 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:38,487 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:38,683 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-03-20 18:48:38,683 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:38,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:38,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1581437808, now seen corresponding path program 18 times [2022-03-20 18:48:38,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:38,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [932896441] [2022-03-20 18:48:38,801 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:38,801 INFO L85 PathProgramCache]: Analyzing trace with hash -676284188, now seen corresponding path program 1 times [2022-03-20 18:48:38,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:38,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052010644] [2022-03-20 18:48:38,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:38,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:38,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:39,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:39,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:39,645 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:48:39,645 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:39,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052010644] [2022-03-20 18:48:39,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052010644] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:39,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252849868] [2022-03-20 18:48:39,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:39,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:39,646 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:39,647 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:48:39,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 18:48:39,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:39,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 18:48:39,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:41,011 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:48:41,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:42,264 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:48:42,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [252849868] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:42,265 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:42,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 9] total 42 [2022-03-20 18:48:45,054 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:45,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [932896441] [2022-03-20 18:48:45,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [932896441] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:45,055 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:45,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 18:48:45,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051024919] [2022-03-20 18:48:45,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:45,055 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 18:48:45,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:45,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 18:48:45,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=2038, Unknown=0, NotChecked=0, Total=2162 [2022-03-20 18:48:45,056 INFO L87 Difference]: Start difference. First operand 87 states and 102 transitions. Second operand has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:05,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:05,992 INFO L93 Difference]: Finished difference Result 135 states and 166 transitions. [2022-03-20 18:49:05,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-20 18:49:05,992 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-20 18:49:05,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:05,993 INFO L225 Difference]: With dead ends: 135 [2022-03-20 18:49:05,993 INFO L226 Difference]: Without dead ends: 124 [2022-03-20 18:49:05,993 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 991 ImplicationChecksByTransitivity, 24.9s TimeCoverageRelationStatistics Valid=565, Invalid=5915, Unknown=0, NotChecked=0, Total=6480 [2022-03-20 18:49:05,994 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 94 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:05,994 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 102 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-20 18:49:05,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-20 18:49:06,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 102. [2022-03-20 18:49:06,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 97 states have (on average 1.2061855670103092) internal successors, (117), 97 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:06,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 121 transitions. [2022-03-20 18:49:06,071 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 121 transitions. Word has length 37 [2022-03-20 18:49:06,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:06,071 INFO L478 AbstractCegarLoop]: Abstraction has 102 states and 121 transitions. [2022-03-20 18:49:06,071 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:06,071 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 121 transitions. [2022-03-20 18:49:06,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:49:06,071 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:06,071 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:06,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-20 18:49:06,272 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-03-20 18:49:06,272 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:06,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:06,272 INFO L85 PathProgramCache]: Analyzing trace with hash 1670686287, now seen corresponding path program 19 times [2022-03-20 18:49:06,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:06,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1868449592] [2022-03-20 18:49:06,386 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:49:06,386 INFO L85 PathProgramCache]: Analyzing trace with hash 692558510, now seen corresponding path program 1 times [2022-03-20 18:49:06,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:06,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328184459] [2022-03-20 18:49:06,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:06,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:06,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:06,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:06,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:06,736 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:49:06,736 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:06,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328184459] [2022-03-20 18:49:06,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328184459] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:06,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41876582] [2022-03-20 18:49:06,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:06,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:06,737 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:06,737 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:49:06,738 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-20 18:49:06,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:06,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 18:49:06,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:49:06,928 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:49:06,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:49:07,619 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:49:07,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41876582] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:49:07,620 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:49:07,620 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2022-03-20 18:49:09,638 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:49:09,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1868449592] [2022-03-20 18:49:09,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1868449592] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:49:09,638 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:49:09,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:49:09,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688238671] [2022-03-20 18:49:09,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:49:09,638 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:49:09,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:09,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:49:09,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:49:09,639 INFO L87 Difference]: Start difference. First operand 102 states and 121 transitions. Second operand has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:16,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:16,357 INFO L93 Difference]: Finished difference Result 172 states and 211 transitions. [2022-03-20 18:49:16,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-20 18:49:16,358 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-20 18:49:16,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:16,358 INFO L225 Difference]: With dead ends: 172 [2022-03-20 18:49:16,359 INFO L226 Difference]: Without dead ends: 105 [2022-03-20 18:49:16,359 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 70 SyntacticMatches, 6 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=427, Invalid=2879, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 18:49:16,360 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 50 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 554 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:16,360 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 85 Invalid, 643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 554 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:49:16,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-03-20 18:49:16,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 88. [2022-03-20 18:49:16,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.2048192771084338) internal successors, (100), 83 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:16,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 104 transitions. [2022-03-20 18:49:16,428 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 104 transitions. Word has length 37 [2022-03-20 18:49:16,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:16,428 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 104 transitions. [2022-03-20 18:49:16,428 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:16,428 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 104 transitions. [2022-03-20 18:49:16,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 18:49:16,428 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:16,428 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:16,444 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-20 18:49:16,629 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-03-20 18:49:16,629 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:16,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:16,629 INFO L85 PathProgramCache]: Analyzing trace with hash -2087930961, now seen corresponding path program 20 times [2022-03-20 18:49:16,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:16,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [21880895] [2022-03-20 18:49:16,713 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:49:16,713 INFO L85 PathProgramCache]: Analyzing trace with hash -594156530, now seen corresponding path program 1 times [2022-03-20 18:49:16,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:16,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989546232] [2022-03-20 18:49:16,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:16,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:16,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:17,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:17,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:17,096 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:49:17,096 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:17,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989546232] [2022-03-20 18:49:17,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989546232] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:17,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949133839] [2022-03-20 18:49:17,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:17,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:17,097 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:17,098 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:49:17,099 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-20 18:49:17,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:17,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 52 conjunts are in the unsatisfiable core [2022-03-20 18:49:17,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:49:18,377 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:18,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:49:19,127 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:49:19,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949133839] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:49:19,127 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:49:19,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 21, 9] total 39 [2022-03-20 18:49:21,123 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:49:21,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [21880895] [2022-03-20 18:49:21,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [21880895] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:49:21,124 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:49:21,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:49:21,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884686745] [2022-03-20 18:49:21,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:49:21,124 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:49:21,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:21,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:49:21,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1718, Unknown=0, NotChecked=0, Total=1892 [2022-03-20 18:49:21,125 INFO L87 Difference]: Start difference. First operand 88 states and 104 transitions. Second operand has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:34,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:34,149 INFO L93 Difference]: Finished difference Result 136 states and 173 transitions. [2022-03-20 18:49:34,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-20 18:49:34,150 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-20 18:49:34,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:34,151 INFO L225 Difference]: With dead ends: 136 [2022-03-20 18:49:34,151 INFO L226 Difference]: Without dead ends: 131 [2022-03-20 18:49:34,151 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1398 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=753, Invalid=6053, Unknown=0, NotChecked=0, Total=6806 [2022-03-20 18:49:34,152 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 66 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 456 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:34,152 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 59 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 456 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 18:49:34,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-03-20 18:49:34,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 104. [2022-03-20 18:49:34,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.2222222222222223) internal successors, (121), 99 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:34,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 125 transitions. [2022-03-20 18:49:34,230 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 125 transitions. Word has length 39 [2022-03-20 18:49:34,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:34,230 INFO L478 AbstractCegarLoop]: Abstraction has 104 states and 125 transitions. [2022-03-20 18:49:34,230 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:34,230 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 125 transitions. [2022-03-20 18:49:34,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 18:49:34,231 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:34,231 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:34,247 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-20 18:49:34,436 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-20 18:49:34,436 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:34,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:34,437 INFO L85 PathProgramCache]: Analyzing trace with hash -355872300, now seen corresponding path program 21 times [2022-03-20 18:49:34,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:34,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [734372475] [2022-03-20 18:49:34,554 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:49:34,554 INFO L85 PathProgramCache]: Analyzing trace with hash 115330453, now seen corresponding path program 1 times [2022-03-20 18:49:34,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:34,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994391429] [2022-03-20 18:49:34,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:34,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:34,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:35,086 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:35,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:35,090 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:49:35,090 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:35,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994391429] [2022-03-20 18:49:35,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994391429] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:35,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567374859] [2022-03-20 18:49:35,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:35,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:35,090 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:35,091 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:49:35,092 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-20 18:49:35,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:35,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 18:49:35,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:49:35,293 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:49:35,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:49:36,003 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:49:36,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567374859] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:49:36,004 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:49:36,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2022-03-20 18:49:38,761 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:49:38,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [734372475] [2022-03-20 18:49:38,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [734372475] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:49:38,762 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:49:38,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 18:49:38,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906132294] [2022-03-20 18:49:38,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:49:38,762 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 18:49:38,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:38,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 18:49:38,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=781, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:49:38,763 INFO L87 Difference]: Start difference. First operand 104 states and 125 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:53,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:53,172 INFO L93 Difference]: Finished difference Result 245 states and 303 transitions. [2022-03-20 18:49:53,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-20 18:49:53,174 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2022-03-20 18:49:53,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:53,174 INFO L225 Difference]: With dead ends: 245 [2022-03-20 18:49:53,174 INFO L226 Difference]: Without dead ends: 172 [2022-03-20 18:49:53,175 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1032 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=566, Invalid=4546, Unknown=0, NotChecked=0, Total=5112 [2022-03-20 18:49:53,175 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 74 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 881 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:53,175 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 102 Invalid, 881 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-20 18:49:53,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-03-20 18:49:53,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 119. [2022-03-20 18:49:53,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.2017543859649122) internal successors, (137), 114 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:53,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 141 transitions. [2022-03-20 18:49:53,269 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 141 transitions. Word has length 40 [2022-03-20 18:49:53,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:53,269 INFO L478 AbstractCegarLoop]: Abstraction has 119 states and 141 transitions. [2022-03-20 18:49:53,269 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:53,269 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 141 transitions. [2022-03-20 18:49:53,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 18:49:53,270 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:53,270 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:53,320 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-20 18:49:53,470 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:53,470 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:53,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:53,471 INFO L85 PathProgramCache]: Analyzing trace with hash -264974095, now seen corresponding path program 10 times [2022-03-20 18:49:53,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:53,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1011998430] [2022-03-20 18:49:53,592 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:49:53,592 INFO L85 PathProgramCache]: Analyzing trace with hash -2113325808, now seen corresponding path program 1 times [2022-03-20 18:49:53,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:53,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935522919] [2022-03-20 18:49:53,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:53,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:53,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:55,045 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:55,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:55,047 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:49:55,047 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:55,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935522919] [2022-03-20 18:49:55,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935522919] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:55,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701208568] [2022-03-20 18:49:55,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:55,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:55,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:55,049 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:49:55,051 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-20 18:49:55,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:55,391 WARN L261 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 91 conjunts are in the unsatisfiable core [2022-03-20 18:49:55,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:50:02,389 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:02,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:50:11,548 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:11,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701208568] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:50:11,549 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:50:11,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 31, 30] total 75 [2022-03-20 18:50:17,976 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:17,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1011998430] [2022-03-20 18:50:17,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1011998430] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:17,977 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:17,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 18:50:17,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540528232] [2022-03-20 18:50:17,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:17,977 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 18:50:17,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:17,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 18:50:17,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1140, Invalid=5340, Unknown=0, NotChecked=0, Total=6480 [2022-03-20 18:50:17,978 INFO L87 Difference]: Start difference. First operand 119 states and 141 transitions. Second operand has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:27,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:27,707 INFO L93 Difference]: Finished difference Result 163 states and 194 transitions. [2022-03-20 18:50:27,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 18:50:27,708 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-20 18:50:27,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:27,709 INFO L225 Difference]: With dead ends: 163 [2022-03-20 18:50:27,709 INFO L226 Difference]: Without dead ends: 144 [2022-03-20 18:50:27,710 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 24 SyntacticMatches, 4 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 29.2s TimeCoverageRelationStatistics Valid=1593, Invalid=9119, Unknown=0, NotChecked=0, Total=10712 [2022-03-20 18:50:27,710 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 36 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 859 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:27,710 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 118 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 859 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-20 18:50:27,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-03-20 18:50:27,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 103. [2022-03-20 18:50:27,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.2040816326530612) internal successors, (118), 98 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:27,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 122 transitions. [2022-03-20 18:50:27,804 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 122 transitions. Word has length 41 [2022-03-20 18:50:27,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:27,804 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 122 transitions. [2022-03-20 18:50:27,804 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:27,804 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 122 transitions. [2022-03-20 18:50:27,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:50:27,804 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:27,804 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:27,808 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-03-20 18:50:28,008 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-03-20 18:50:28,008 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:28,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:28,009 INFO L85 PathProgramCache]: Analyzing trace with hash 410232754, now seen corresponding path program 11 times [2022-03-20 18:50:28,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:28,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2003531543] [2022-03-20 18:50:28,127 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:50:28,127 INFO L85 PathProgramCache]: Analyzing trace with hash -77736013, now seen corresponding path program 1 times [2022-03-20 18:50:28,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:28,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1614329718] [2022-03-20 18:50:28,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:28,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:28,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:28,467 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:28,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:28,470 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:50:28,470 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:28,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1614329718] [2022-03-20 18:50:28,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1614329718] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:50:28,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368015971] [2022-03-20 18:50:28,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:28,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:28,470 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:50:28,471 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:50:28,473 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-20 18:50:28,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:28,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 18:50:28,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:50:28,635 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:50:28,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:50:28,749 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:50:28,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368015971] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:50:28,749 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:50:28,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 9 [2022-03-20 18:50:30,053 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:30,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2003531543] [2022-03-20 18:50:30,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2003531543] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:30,053 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:30,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:50:30,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625916647] [2022-03-20 18:50:30,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:30,053 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:50:30,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:30,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:50:30,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:50:30,054 INFO L87 Difference]: Start difference. First operand 103 states and 122 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:35,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:35,184 INFO L93 Difference]: Finished difference Result 130 states and 154 transitions. [2022-03-20 18:50:35,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-20 18:50:35,185 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-20 18:50:35,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:35,185 INFO L225 Difference]: With dead ends: 130 [2022-03-20 18:50:35,185 INFO L226 Difference]: Without dead ends: 99 [2022-03-20 18:50:35,186 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 91 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=269, Invalid=1213, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 18:50:35,191 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 37 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:35,191 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 58 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:50:35,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-20 18:50:35,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 84. [2022-03-20 18:50:35,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.2278481012658229) internal successors, (97), 79 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:35,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2022-03-20 18:50:35,270 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 42 [2022-03-20 18:50:35,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:35,271 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2022-03-20 18:50:35,271 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:35,271 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2022-03-20 18:50:35,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:50:35,271 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:35,271 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:35,289 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-03-20 18:50:35,472 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:35,472 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:35,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:35,472 INFO L85 PathProgramCache]: Analyzing trace with hash -764094061, now seen corresponding path program 22 times [2022-03-20 18:50:35,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:35,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [846796303] [2022-03-20 18:50:35,589 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:50:35,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1130255969, now seen corresponding path program 1 times [2022-03-20 18:50:35,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:35,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419432229] [2022-03-20 18:50:35,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:35,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:35,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:36,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:36,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:36,764 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:50:36,764 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:36,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419432229] [2022-03-20 18:50:36,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419432229] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:50:36,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359197493] [2022-03-20 18:50:36,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:36,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:36,765 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:50:36,766 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:50:36,766 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-20 18:50:36,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:36,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:50:36,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:50:37,907 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:50:37,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:50:38,020 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:50:38,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359197493] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:50:38,021 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:50:38,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10, 10] total 28 [2022-03-20 18:50:44,189 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:44,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [846796303] [2022-03-20 18:50:44,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [846796303] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:44,189 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:44,189 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 18:50:44,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756917673] [2022-03-20 18:50:44,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:44,189 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 18:50:44,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:44,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 18:50:44,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1085, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 18:50:44,190 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:18,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:18,763 INFO L93 Difference]: Finished difference Result 184 states and 226 transitions. [2022-03-20 18:51:18,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-20 18:51:18,764 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-20 18:51:18,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:18,765 INFO L225 Difference]: With dead ends: 184 [2022-03-20 18:51:18,765 INFO L226 Difference]: Without dead ends: 167 [2022-03-20 18:51:18,766 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1359 ImplicationChecksByTransitivity, 39.4s TimeCoverageRelationStatistics Valid=725, Invalid=5437, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 18:51:18,766 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 110 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:18,766 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 97 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-03-20 18:51:18,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-03-20 18:51:18,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 108. [2022-03-20 18:51:18,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.233009708737864) internal successors, (127), 103 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:18,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 131 transitions. [2022-03-20 18:51:18,870 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 131 transitions. Word has length 42 [2022-03-20 18:51:18,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:18,870 INFO L478 AbstractCegarLoop]: Abstraction has 108 states and 131 transitions. [2022-03-20 18:51:18,870 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:18,870 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 131 transitions. [2022-03-20 18:51:18,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 18:51:18,871 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:18,871 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:18,888 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:19,071 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:19,071 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:19,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:19,072 INFO L85 PathProgramCache]: Analyzing trace with hash -774755905, now seen corresponding path program 23 times [2022-03-20 18:51:19,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:19,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1402129743] [2022-03-20 18:51:19,155 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:19,155 INFO L85 PathProgramCache]: Analyzing trace with hash 1735486323, now seen corresponding path program 1 times [2022-03-20 18:51:19,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:19,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609546794] [2022-03-20 18:51:19,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:19,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:19,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:20,268 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:20,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:20,270 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:51:20,271 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:20,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609546794] [2022-03-20 18:51:20,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609546794] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:20,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76765925] [2022-03-20 18:51:20,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:20,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:20,271 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:20,272 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:20,273 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-20 18:51:20,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:20,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:51:20,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:21,709 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:51:21,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:22,100 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:51:22,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76765925] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:22,100 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:22,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10, 10] total 24 [2022-03-20 18:51:25,075 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:25,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1402129743] [2022-03-20 18:51:25,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1402129743] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:25,075 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:25,076 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 18:51:25,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321276792] [2022-03-20 18:51:25,076 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:25,076 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 18:51:25,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:25,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 18:51:25,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:51:25,076 INFO L87 Difference]: Start difference. First operand 108 states and 131 transitions. Second operand has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:41,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:41,604 INFO L93 Difference]: Finished difference Result 175 states and 223 transitions. [2022-03-20 18:51:41,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-20 18:51:41,605 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-20 18:51:41,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:41,605 INFO L225 Difference]: With dead ends: 175 [2022-03-20 18:51:41,605 INFO L226 Difference]: Without dead ends: 170 [2022-03-20 18:51:41,606 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1626 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=944, Invalid=4908, Unknown=0, NotChecked=0, Total=5852 [2022-03-20 18:51:41,606 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 65 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 534 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:41,606 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 54 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 534 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-03-20 18:51:41,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-03-20 18:51:41,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 126. [2022-03-20 18:51:41,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.2396694214876034) internal successors, (150), 121 states have internal predecessors, (150), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:41,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 154 transitions. [2022-03-20 18:51:41,729 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 154 transitions. Word has length 43 [2022-03-20 18:51:41,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:41,729 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 154 transitions. [2022-03-20 18:51:41,729 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:41,729 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 154 transitions. [2022-03-20 18:51:41,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 18:51:41,730 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:41,730 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:41,748 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:41,946 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-03-20 18:51:41,946 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:41,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:41,946 INFO L85 PathProgramCache]: Analyzing trace with hash -107841918, now seen corresponding path program 24 times [2022-03-20 18:51:41,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:41,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [912865302] [2022-03-20 18:51:42,028 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:42,028 INFO L85 PathProgramCache]: Analyzing trace with hash 602628878, now seen corresponding path program 1 times [2022-03-20 18:51:42,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:42,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424276660] [2022-03-20 18:51:42,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:42,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:42,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:43,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:43,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:43,052 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:51:43,052 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:43,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424276660] [2022-03-20 18:51:43,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424276660] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:43,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524110252] [2022-03-20 18:51:43,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:43,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:43,052 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:43,053 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:43,055 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-20 18:51:43,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:43,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 46 conjunts are in the unsatisfiable core [2022-03-20 18:51:43,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:43,348 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:51:43,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:44,514 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:51:44,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1524110252] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:44,514 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:44,514 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 28 [2022-03-20 18:51:49,658 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:49,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [912865302] [2022-03-20 18:51:49,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [912865302] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:49,659 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:49,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 18:51:49,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082584498] [2022-03-20 18:51:49,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:49,659 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 18:51:49,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:49,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 18:51:49,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1017, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:51:49,660 INFO L87 Difference]: Start difference. First operand 126 states and 154 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:15,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:52:15,822 INFO L93 Difference]: Finished difference Result 327 states and 404 transitions. [2022-03-20 18:52:15,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-03-20 18:52:15,824 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-20 18:52:15,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:52:15,825 INFO L225 Difference]: With dead ends: 327 [2022-03-20 18:52:15,825 INFO L226 Difference]: Without dead ends: 229 [2022-03-20 18:52:15,825 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1463 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=731, Invalid=6241, Unknown=0, NotChecked=0, Total=6972 [2022-03-20 18:52:15,826 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 81 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 939 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 1090 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:52:15,826 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 109 Invalid, 1090 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 939 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-03-20 18:52:15,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-03-20 18:52:15,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 143. [2022-03-20 18:52:15,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.2173913043478262) internal successors, (168), 138 states have internal predecessors, (168), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:15,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 172 transitions. [2022-03-20 18:52:15,963 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 172 transitions. Word has length 44 [2022-03-20 18:52:15,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:52:15,963 INFO L478 AbstractCegarLoop]: Abstraction has 143 states and 172 transitions. [2022-03-20 18:52:15,963 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:15,963 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 172 transitions. [2022-03-20 18:52:15,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 18:52:15,963 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:52:15,963 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:52:15,979 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-03-20 18:52:16,179 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-03-20 18:52:16,180 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:52:16,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:52:16,180 INFO L85 PathProgramCache]: Analyzing trace with hash 284721058, now seen corresponding path program 12 times [2022-03-20 18:52:16,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:16,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1103722749] [2022-03-20 18:52:16,318 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:52:16,318 INFO L85 PathProgramCache]: Analyzing trace with hash 1354334446, now seen corresponding path program 1 times [2022-03-20 18:52:16,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:52:16,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969397566] [2022-03-20 18:52:16,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:16,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:52:16,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:18,508 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:52:18,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:18,514 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 69 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:52:18,514 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:52:18,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969397566] [2022-03-20 18:52:18,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969397566] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:52:18,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746303966] [2022-03-20 18:52:18,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:18,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:18,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:52:18,516 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:52:18,516 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-20 18:52:19,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:19,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 80 conjunts are in the unsatisfiable core [2022-03-20 18:52:19,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:52:27,573 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:27,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:52:40,323 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:40,323 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746303966] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:52:40,323 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:52:40,323 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 28, 34] total 78 [2022-03-20 18:52:54,076 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:52:54,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1103722749] [2022-03-20 18:52:54,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1103722749] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:52:54,077 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:52:54,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 18:52:54,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257222464] [2022-03-20 18:52:54,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:52:54,077 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 18:52:54,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:54,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 18:52:54,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1046, Invalid=6094, Unknown=0, NotChecked=0, Total=7140 [2022-03-20 18:52:54,078 INFO L87 Difference]: Start difference. First operand 143 states and 172 transitions. Second operand has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 27 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:11,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:53:11,757 INFO L93 Difference]: Finished difference Result 162 states and 192 transitions. [2022-03-20 18:53:11,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-20 18:53:11,759 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 27 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-03-20 18:53:11,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:53:11,759 INFO L225 Difference]: With dead ends: 162 [2022-03-20 18:53:11,759 INFO L226 Difference]: Without dead ends: 157 [2022-03-20 18:53:11,760 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 48.5s TimeCoverageRelationStatistics Valid=1490, Invalid=10500, Unknown=0, NotChecked=0, Total=11990 [2022-03-20 18:53:11,760 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 32 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:53:11,760 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 113 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-03-20 18:53:11,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-03-20 18:53:11,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 150. [2022-03-20 18:53:11,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 145 states have (on average 1.2137931034482758) internal successors, (176), 145 states have internal predecessors, (176), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:11,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 180 transitions. [2022-03-20 18:53:11,911 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 180 transitions. Word has length 46 [2022-03-20 18:53:11,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:53:11,911 INFO L478 AbstractCegarLoop]: Abstraction has 150 states and 180 transitions. [2022-03-20 18:53:11,911 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 27 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:11,911 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 180 transitions. [2022-03-20 18:53:11,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 18:53:11,912 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:53:11,912 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:53:11,921 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-03-20 18:53:12,115 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-03-20 18:53:12,116 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:53:12,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:53:12,116 INFO L85 PathProgramCache]: Analyzing trace with hash 805665187, now seen corresponding path program 25 times [2022-03-20 18:53:12,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:12,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2045100771] [2022-03-20 18:53:12,232 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:53:12,232 INFO L85 PathProgramCache]: Analyzing trace with hash 167558404, now seen corresponding path program 1 times [2022-03-20 18:53:12,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:53:12,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615013745] [2022-03-20 18:53:12,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:53:12,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:53:12,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:14,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:53:14,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:14,055 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:53:14,055 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:53:14,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615013745] [2022-03-20 18:53:14,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615013745] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:53:14,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570743856] [2022-03-20 18:53:14,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:53:14,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:53:14,056 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:53:14,057 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:53:14,058 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-20 18:53:14,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:14,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:53:14,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:53:16,028 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:53:16,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:53:16,174 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:53:16,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570743856] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:53:16,174 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:53:16,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11, 11] total 32 [2022-03-20 18:53:27,217 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:53:27,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2045100771] [2022-03-20 18:53:27,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2045100771] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:53:27,218 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:53:27,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 18:53:27,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687431398] [2022-03-20 18:53:27,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:53:27,218 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 18:53:27,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:27,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 18:53:27,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1442, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:53:27,219 INFO L87 Difference]: Start difference. First operand 150 states and 180 transitions. Second operand has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:53,968 WARN L232 SmtUtils]: Spent 8.49s on a formula simplification. DAG size of input: 135 DAG size of output: 96 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 18:54:51,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:54:51,932 INFO L93 Difference]: Finished difference Result 258 states and 311 transitions. [2022-03-20 18:54:51,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-03-20 18:54:51,934 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-03-20 18:54:51,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:54:51,935 INFO L225 Difference]: With dead ends: 258 [2022-03-20 18:54:51,935 INFO L226 Difference]: Without dead ends: 245 [2022-03-20 18:54:51,936 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2451 ImplicationChecksByTransitivity, 92.8s TimeCoverageRelationStatistics Valid=1227, Invalid=8873, Unknown=0, NotChecked=0, Total=10100 [2022-03-20 18:54:51,936 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 151 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 652 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:54:51,936 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 109 Invalid, 864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 652 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-03-20 18:54:51,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2022-03-20 18:54:52,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 184. [2022-03-20 18:54:52,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.229050279329609) internal successors, (220), 179 states have internal predecessors, (220), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:52,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 224 transitions. [2022-03-20 18:54:52,129 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 224 transitions. Word has length 46 [2022-03-20 18:54:52,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:54:52,129 INFO L478 AbstractCegarLoop]: Abstraction has 184 states and 224 transitions. [2022-03-20 18:54:52,129 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:52,129 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 224 transitions. [2022-03-20 18:54:52,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 18:54:52,130 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:54:52,130 INFO L499 BasicCegarLoop]: trace histogram [10, 8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:54:52,145 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-03-20 18:54:52,333 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-03-20 18:54:52,333 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:54:52,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:54:52,333 INFO L85 PathProgramCache]: Analyzing trace with hash 2029655459, now seen corresponding path program 26 times [2022-03-20 18:54:52,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:52,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [555777763] [2022-03-20 18:54:52,458 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:54:52,458 INFO L85 PathProgramCache]: Analyzing trace with hash -924821180, now seen corresponding path program 1 times [2022-03-20 18:54:52,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:54:52,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964582662] [2022-03-20 18:54:52,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:52,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:54:52,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:54,537 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:54:54,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:54,545 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:54:54,545 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:54:54,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964582662] [2022-03-20 18:54:54,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964582662] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:54:54,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057576491] [2022-03-20 18:54:54,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:54,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:54:54,546 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:54:54,547 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:54:54,548 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-20 18:54:54,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:54,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 64 conjunts are in the unsatisfiable core [2022-03-20 18:54:54,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:54:58,801 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:54:58,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:55:08,281 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:55:08,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057576491] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:55:08,281 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:55:08,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 21] total 60 [2022-03-20 18:55:25,673 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:55:25,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [555777763] [2022-03-20 18:55:25,673 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [555777763] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:55:25,673 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:55:25,673 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 18:55:25,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88185143] [2022-03-20 18:55:25,673 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:55:25,673 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 18:55:25,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:25,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 18:55:25,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=4089, Unknown=0, NotChecked=0, Total=4422 [2022-03-20 18:55:25,674 INFO L87 Difference]: Start difference. First operand 184 states and 224 transitions. Second operand has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:55:59,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:55:59,020 INFO L93 Difference]: Finished difference Result 272 states and 335 transitions. [2022-03-20 18:55:59,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-20 18:55:59,022 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-03-20 18:55:59,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:55:59,023 INFO L225 Difference]: With dead ends: 272 [2022-03-20 18:55:59,023 INFO L226 Difference]: Without dead ends: 194 [2022-03-20 18:55:59,024 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1936 ImplicationChecksByTransitivity, 61.4s TimeCoverageRelationStatistics Valid=1002, Invalid=9098, Unknown=0, NotChecked=0, Total=10100 [2022-03-20 18:55:59,024 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 44 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 853 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 853 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:55:59,024 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 93 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 853 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-03-20 18:55:59,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-03-20 18:55:59,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 161. [2022-03-20 18:55:59,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.185897435897436) internal successors, (185), 156 states have internal predecessors, (185), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:55:59,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 189 transitions. [2022-03-20 18:55:59,197 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 189 transitions. Word has length 46 [2022-03-20 18:55:59,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:55:59,197 INFO L478 AbstractCegarLoop]: Abstraction has 161 states and 189 transitions. [2022-03-20 18:55:59,197 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:55:59,197 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 189 transitions. [2022-03-20 18:55:59,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 18:55:59,197 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:55:59,197 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:55:59,216 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-03-20 18:55:59,416 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:55:59,416 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:55:59,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:55:59,416 INFO L85 PathProgramCache]: Analyzing trace with hash 270913313, now seen corresponding path program 13 times [2022-03-20 18:55:59,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:59,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [643156961] [2022-03-20 18:55:59,503 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:55:59,504 INFO L85 PathProgramCache]: Analyzing trace with hash -350959595, now seen corresponding path program 1 times [2022-03-20 18:55:59,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:55:59,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764519242] [2022-03-20 18:55:59,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:55:59,504 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:55:59,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:00,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:56:00,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:00,728 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-03-20 18:56:00,728 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:56:00,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764519242] [2022-03-20 18:56:00,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764519242] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:56:00,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599581693] [2022-03-20 18:56:00,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:00,728 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:56:00,728 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:56:00,730 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:56:00,730 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-20 18:56:00,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:00,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 52 conjunts are in the unsatisfiable core [2022-03-20 18:56:00,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:56:02,604 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 7 proven. 63 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:56:02,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:56:06,743 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 7 proven. 63 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:56:06,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599581693] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:56:06,744 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:56:06,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 19, 22] total 33 [2022-03-20 18:56:16,119 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:56:16,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [643156961] [2022-03-20 18:56:16,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [643156961] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:56:16,119 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:56:16,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:56:16,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916670876] [2022-03-20 18:56:16,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:56:16,119 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:56:16,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:16,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:56:16,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1366, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 18:56:16,120 INFO L87 Difference]: Start difference. First operand 161 states and 189 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:55,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:56:55,288 INFO L93 Difference]: Finished difference Result 200 states and 235 transitions. [2022-03-20 18:56:55,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 18:56:55,289 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-20 18:56:55,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:56:55,289 INFO L225 Difference]: With dead ends: 200 [2022-03-20 18:56:55,289 INFO L226 Difference]: Without dead ends: 187 [2022-03-20 18:56:55,290 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 76 SyntacticMatches, 5 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 51.5s TimeCoverageRelationStatistics Valid=468, Invalid=4224, Unknown=0, NotChecked=0, Total=4692 [2022-03-20 18:56:55,290 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 49 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:56:55,290 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 68 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-03-20 18:56:55,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-03-20 18:56:55,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 161. [2022-03-20 18:56:55,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.1794871794871795) internal successors, (184), 156 states have internal predecessors, (184), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:55,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 188 transitions. [2022-03-20 18:56:55,476 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 188 transitions. Word has length 47 [2022-03-20 18:56:55,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:56:55,476 INFO L478 AbstractCegarLoop]: Abstraction has 161 states and 188 transitions. [2022-03-20 18:56:55,476 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:55,476 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 188 transitions. [2022-03-20 18:56:55,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 18:56:55,477 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:56:55,477 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:56:55,494 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-03-20 18:56:55,677 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-03-20 18:56:55,678 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:56:55,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:56:55,678 INFO L85 PathProgramCache]: Analyzing trace with hash 643140527, now seen corresponding path program 27 times [2022-03-20 18:56:55,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:55,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1817334867] [2022-03-20 18:56:55,764 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:56:55,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1662634926, now seen corresponding path program 1 times [2022-03-20 18:56:55,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:56:55,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459938443] [2022-03-20 18:56:55,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:55,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:56:55,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:57,394 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:56:57,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:57,397 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 18:56:57,397 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:56:57,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459938443] [2022-03-20 18:56:57,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459938443] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:56:57,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889070964] [2022-03-20 18:56:57,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:57,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:56:57,397 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:56:57,398 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:56:57,399 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-20 18:56:57,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:57,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:56:57,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:56:59,935 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 18:56:59,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:57:00,577 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 18:57:00,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889070964] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:57:00,578 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:57:00,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 11, 11] total 27 [2022-03-20 18:57:08,137 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:57:08,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1817334867] [2022-03-20 18:57:08,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1817334867] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:57:08,137 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:57:08,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 18:57:08,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505713646] [2022-03-20 18:57:08,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:57:08,137 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 18:57:08,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:57:08,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 18:57:08,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=923, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:57:08,138 INFO L87 Difference]: Start difference. First operand 161 states and 188 transitions. Second operand has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 25 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:58:00,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:58:00,947 INFO L93 Difference]: Finished difference Result 215 states and 260 transitions. [2022-03-20 18:58:00,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-03-20 18:58:00,952 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 25 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-20 18:58:00,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:58:00,952 INFO L225 Difference]: With dead ends: 215 [2022-03-20 18:58:00,953 INFO L226 Difference]: Without dead ends: 210 [2022-03-20 18:58:00,953 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3090 ImplicationChecksByTransitivity, 56.5s TimeCoverageRelationStatistics Valid=1518, Invalid=8784, Unknown=0, NotChecked=0, Total=10302 [2022-03-20 18:58:00,953 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 99 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 659 mSolverCounterSat, 307 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 966 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 307 IncrementalHoareTripleChecker+Valid, 659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:58:00,953 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 50 Invalid, 966 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [307 Valid, 659 Invalid, 0 Unknown, 0 Unchecked, 7.2s Time] [2022-03-20 18:58:00,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-03-20 18:58:01,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 172. [2022-03-20 18:58:01,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.1796407185628743) internal successors, (197), 167 states have internal predecessors, (197), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:58:01,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 201 transitions. [2022-03-20 18:58:01,146 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 201 transitions. Word has length 47 [2022-03-20 18:58:01,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:58:01,146 INFO L478 AbstractCegarLoop]: Abstraction has 172 states and 201 transitions. [2022-03-20 18:58:01,146 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 25 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:58:01,147 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 201 transitions. [2022-03-20 18:58:01,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 18:58:01,147 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:58:01,147 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:58:01,163 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-03-20 18:58:01,355 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:58:01,355 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:58:01,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:58:01,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1962219230, now seen corresponding path program 28 times [2022-03-20 18:58:01,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:58:01,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2050453858] [2022-03-20 18:58:01,488 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:58:01,489 INFO L85 PathProgramCache]: Analyzing trace with hash -106275171, now seen corresponding path program 1 times [2022-03-20 18:58:01,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:58:01,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744930267] [2022-03-20 18:58:01,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:58:01,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:58:01,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:04,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:58:04,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:04,697 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:58:04,697 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:58:04,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744930267] [2022-03-20 18:58:04,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744930267] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:58:04,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540834174] [2022-03-20 18:58:04,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:58:04,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:58:04,698 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:58:04,704 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:58:04,708 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-20 18:58:04,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:04,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-20 18:58:04,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:58:05,320 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:58:05,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:58:09,065 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:58:09,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540834174] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:58:09,066 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:58:09,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 33 [2022-03-20 18:58:23,736 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:58:23,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2050453858] [2022-03-20 18:58:23,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2050453858] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:58:23,736 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:58:23,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 18:58:23,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490160269] [2022-03-20 18:58:23,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:58:23,736 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 18:58:23,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:58:23,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 18:58:23,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1442, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:58:23,737 INFO L87 Difference]: Start difference. First operand 172 states and 201 transitions. Second operand has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:56,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:00:56,987 INFO L93 Difference]: Finished difference Result 413 states and 515 transitions. [2022-03-20 19:00:56,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-03-20 19:00:56,988 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-20 19:00:56,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:00:56,989 INFO L225 Difference]: With dead ends: 413 [2022-03-20 19:00:56,989 INFO L226 Difference]: Without dead ends: 322 [2022-03-20 19:00:56,990 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 84 SyntacticMatches, 6 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8008 ImplicationChecksByTransitivity, 157.0s TimeCoverageRelationStatistics Valid=3736, Invalid=21704, Unknown=0, NotChecked=0, Total=25440 [2022-03-20 19:00:56,990 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 269 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1286 mSolverCounterSat, 615 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 1901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 615 IncrementalHoareTripleChecker+Valid, 1286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.9s IncrementalHoareTripleChecker+Time [2022-03-20 19:00:56,990 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 136 Invalid, 1901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [615 Valid, 1286 Invalid, 0 Unknown, 0 Unchecked, 16.9s Time] [2022-03-20 19:00:56,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-03-20 19:00:57,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 206. [2022-03-20 19:00:57,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 201 states have (on average 1.1741293532338308) internal successors, (236), 201 states have internal predecessors, (236), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:57,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 240 transitions. [2022-03-20 19:00:57,235 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 240 transitions. Word has length 47 [2022-03-20 19:00:57,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:00:57,235 INFO L478 AbstractCegarLoop]: Abstraction has 206 states and 240 transitions. [2022-03-20 19:00:57,235 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:57,235 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 240 transitions. [2022-03-20 19:00:57,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 19:00:57,235 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:00:57,235 INFO L499 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:00:57,252 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-03-20 19:00:57,441 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-03-20 19:00:57,441 INFO L403 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:00:57,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:00:57,441 INFO L85 PathProgramCache]: Analyzing trace with hash 381113698, now seen corresponding path program 14 times [2022-03-20 19:00:57,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:00:57,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [628151847] [2022-03-20 19:00:57,578 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:00:57,578 INFO L85 PathProgramCache]: Analyzing trace with hash -921583058, now seen corresponding path program 1 times [2022-03-20 19:00:57,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:00:57,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549461344] [2022-03-20 19:00:57,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:00:57,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:00:57,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:59,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:00:59,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:59,748 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 14 proven. 42 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-03-20 19:00:59,748 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:00:59,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549461344] [2022-03-20 19:00:59,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549461344] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:00:59,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781128451] [2022-03-20 19:00:59,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:00:59,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:00:59,749 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:00:59,750 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:00:59,750 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-20 19:00:59,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:59,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 19:00:59,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:01:00,611 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 14 proven. 42 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-03-20 19:01:00,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:01:01,361 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 14 proven. 42 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-03-20 19:01:01,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781128451] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:01:01,362 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:01:01,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 10 [2022-03-20 19:01:08,979 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:01:08,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [628151847] [2022-03-20 19:01:08,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [628151847] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:01:08,980 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:01:08,980 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 19:01:08,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973152056] [2022-03-20 19:01:08,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:01:08,980 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 19:01:08,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:01:08,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 19:01:08,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2022-03-20 19:01:08,981 INFO L87 Difference]: Start difference. First operand 206 states and 240 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)