/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/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 20:15:58,727 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 20:15:58,755 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 20:15:58,774 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 20:15:58,814 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 20:15:58,815 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 20:15:58,816 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 20:15:58,816 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-04-06 20:15:58,825 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 20:15:58,825 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 20:15:58,827 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 20:15:58,827 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 20:15:58,827 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 20:15:58,827 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 20:15:58,827 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 20:15:58,827 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 20:15:58,827 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 20:15:58,828 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 20:15:58,828 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 20:15:58,828 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 20:15:58,828 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 20:15:58,828 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 20:15:58,828 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 20:15:58,828 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 20:15:58,828 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 20:15:58,828 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 20:15:58,829 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 20:15:58,829 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 20:15:58,829 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 20:15:58,829 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-04-06 20:15:58,829 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 20:15:59,005 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 20:15:59,028 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 20:15:59,029 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 20:15:59,030 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 20:15:59,031 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 20:15:59,031 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2022-04-06 20:15:59,085 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26c386b6a/08dd67c7bcab44c29a63db4938a39486/FLAG7d0f5026c [2022-04-06 20:15:59,453 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 20:15:59,453 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2022-04-06 20:15:59,467 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26c386b6a/08dd67c7bcab44c29a63db4938a39486/FLAG7d0f5026c [2022-04-06 20:15:59,480 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26c386b6a/08dd67c7bcab44c29a63db4938a39486 [2022-04-06 20:15:59,481 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 20:15:59,483 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 20:15:59,485 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 20:15:59,485 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 20:15:59,487 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 20:15:59,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@556fb88e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59, skipping insertion in model container [2022-04-06 20:15:59,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,494 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 20:15:59,518 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 20:15:59,746 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c[7920,7933] [2022-04-06 20:15:59,753 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 20:15:59,765 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 20:15:59,802 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c[7920,7933] [2022-04-06 20:15:59,804 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 20:15:59,817 INFO L208 MainTranslator]: Completed translation [2022-04-06 20:15:59,818 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59 WrapperNode [2022-04-06 20:15:59,818 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 20:15:59,818 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 20:15:59,818 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 20:15:59,819 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 20:15:59,825 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,826 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,838 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,839 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,857 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,859 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,860 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,863 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 20:15:59,863 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 20:15:59,863 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 20:15:59,864 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 20:15:59,864 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (1/1) ... [2022-04-06 20:15:59,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 20:15:59,890 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:15:59,898 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 20:15:59,903 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 20:15:59,933 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 20:15:59,933 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 20:15:59,933 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 20:15:59,934 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 20:15:59,934 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 20:15:59,934 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 20:15:59,934 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 20:15:59,934 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 20:15:59,934 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2022-04-06 20:15:59,934 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-04-06 20:15:59,935 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 20:16:00,030 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 20:16:00,031 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 20:16:00,481 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 20:16:00,485 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 20:16:00,485 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-04-06 20:16:00,486 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 08:16:00 BoogieIcfgContainer [2022-04-06 20:16:00,486 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 20:16:00,487 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 20:16:00,488 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 20:16:00,491 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 20:16:00,491 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 08:15:59" (1/3) ... [2022-04-06 20:16:00,491 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fd44361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 08:16:00, skipping insertion in model container [2022-04-06 20:16:00,491 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:15:59" (2/3) ... [2022-04-06 20:16:00,492 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fd44361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 08:16:00, skipping insertion in model container [2022-04-06 20:16:00,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 08:16:00" (3/3) ... [2022-04-06 20:16:00,493 INFO L111 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+cfa-reducer.c [2022-04-06 20:16:00,498 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 20:16:00,498 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 20:16:00,532 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 20:16:00,537 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 20:16:00,537 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 20:16:00,546 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 20:16:00,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-04-06 20:16:00,551 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:00,551 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:00,552 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:00,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:00,555 INFO L85 PathProgramCache]: Analyzing trace with hash 2001183330, now seen corresponding path program 1 times [2022-04-06 20:16:00,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:00,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [537327570] [2022-04-06 20:16:00,567 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:00,567 INFO L85 PathProgramCache]: Analyzing trace with hash 2001183330, now seen corresponding path program 2 times [2022-04-06 20:16:00,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:00,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922152713] [2022-04-06 20:16:00,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:00,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:00,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:00,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:00,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:00,899 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:00,899 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:00,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922152713] [2022-04-06 20:16:00,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922152713] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:00,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:00,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 20:16:00,902 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:00,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [537327570] [2022-04-06 20:16:00,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [537327570] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:00,903 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:00,903 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 20:16:00,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672189022] [2022-04-06 20:16:00,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:00,907 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 20:16:00,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:00,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 20:16:00,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 20:16:00,929 INFO L87 Difference]: Start difference. First operand has 19 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:01,009 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2022-04-06 20:16:01,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 20:16:01,011 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-04-06 20:16:01,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:01,016 INFO L225 Difference]: With dead ends: 46 [2022-04-06 20:16:01,016 INFO L226 Difference]: Without dead ends: 24 [2022-04-06 20:16:01,018 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-04-06 20:16:01,021 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 33 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:01,022 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 41 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 20:16:01,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-04-06 20:16:01,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2022-04-06 20:16:01,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-04-06 20:16:01,045 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2022-04-06 20:16:01,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:01,045 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-04-06 20:16:01,045 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,045 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-04-06 20:16:01,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-04-06 20:16:01,046 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:01,046 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:01,046 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 20:16:01,046 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:01,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:01,047 INFO L85 PathProgramCache]: Analyzing trace with hash 2000766256, now seen corresponding path program 1 times [2022-04-06 20:16:01,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:01,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [828909670] [2022-04-06 20:16:01,048 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:01,048 INFO L85 PathProgramCache]: Analyzing trace with hash 2000766256, now seen corresponding path program 2 times [2022-04-06 20:16:01,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:01,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288683017] [2022-04-06 20:16:01,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:01,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:01,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:01,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:01,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:01,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:01,142 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:01,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288683017] [2022-04-06 20:16:01,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288683017] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:01,145 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:01,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 20:16:01,145 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:01,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [828909670] [2022-04-06 20:16:01,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [828909670] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:01,146 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:01,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 20:16:01,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127120937] [2022-04-06 20:16:01,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:01,147 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 20:16:01,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:01,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 20:16:01,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 20:16:01,148 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:01,217 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2022-04-06 20:16:01,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 20:16:01,217 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-04-06 20:16:01,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:01,218 INFO L225 Difference]: With dead ends: 28 [2022-04-06 20:16:01,219 INFO L226 Difference]: Without dead ends: 26 [2022-04-06 20:16:01,219 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 20:16:01,222 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 11 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:01,222 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 41 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 20:16:01,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-04-06 20:16:01,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-04-06 20:16:01,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-04-06 20:16:01,234 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2022-04-06 20:16:01,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:01,235 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-04-06 20:16:01,235 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,235 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-04-06 20:16:01,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-04-06 20:16:01,236 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:01,236 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:01,236 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 20:16:01,236 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:01,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:01,237 INFO L85 PathProgramCache]: Analyzing trace with hash -1978265494, now seen corresponding path program 1 times [2022-04-06 20:16:01,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:01,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [893353601] [2022-04-06 20:16:01,241 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:01,241 INFO L85 PathProgramCache]: Analyzing trace with hash -1978265494, now seen corresponding path program 2 times [2022-04-06 20:16:01,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:01,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103623681] [2022-04-06 20:16:01,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:01,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:01,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:01,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:01,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:01,367 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:01,367 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:01,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103623681] [2022-04-06 20:16:01,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103623681] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:01,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805153077] [2022-04-06 20:16:01,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:16:01,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:01,368 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:01,369 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:01,412 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 20:16:01,593 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:16:01,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:01,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 20:16:01,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:01,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:01,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:16:01,839 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:01,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805153077] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:16:01,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:16:01,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-04-06 20:16:01,840 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:01,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [893353601] [2022-04-06 20:16:01,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [893353601] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:01,841 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:01,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 20:16:01,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553841546] [2022-04-06 20:16:01,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:01,842 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 20:16:01,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:01,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 20:16:01,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-04-06 20:16:01,843 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:01,946 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-04-06 20:16:01,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 20:16:01,946 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), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-04-06 20:16:01,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:01,947 INFO L225 Difference]: With dead ends: 40 [2022-04-06 20:16:01,947 INFO L226 Difference]: Without dead ends: 30 [2022-04-06 20:16:01,947 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2022-04-06 20:16:01,948 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 17 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:01,948 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 41 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 20:16:01,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-04-06 20:16:01,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2022-04-06 20:16:01,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-04-06 20:16:01,953 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19 [2022-04-06 20:16:01,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:01,953 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-04-06 20:16:01,953 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), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:01,953 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-04-06 20:16:01,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-04-06 20:16:01,953 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:01,953 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:01,974 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 20:16:02,163 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:02,164 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:02,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:02,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1594611826, now seen corresponding path program 3 times [2022-04-06 20:16:02,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:02,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1967867507] [2022-04-06 20:16:02,165 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:02,165 INFO L85 PathProgramCache]: Analyzing trace with hash 1594611826, now seen corresponding path program 4 times [2022-04-06 20:16:02,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:02,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402006898] [2022-04-06 20:16:02,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:02,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:02,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:02,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:02,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:02,253 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:02,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:02,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402006898] [2022-04-06 20:16:02,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402006898] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:02,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122604177] [2022-04-06 20:16:02,253 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:16:02,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:02,253 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:02,259 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:02,261 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 20:16:02,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:16:02,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:02,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 601 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 20:16:02,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:02,494 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:02,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:16:02,572 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:02,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122604177] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:16:02,573 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:16:02,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 12 [2022-04-06 20:16:02,573 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:02,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1967867507] [2022-04-06 20:16:02,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1967867507] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:02,573 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:02,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 20:16:02,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723327303] [2022-04-06 20:16:02,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:02,574 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 20:16:02,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:02,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 20:16:02,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-04-06 20:16:02,574 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:02,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:02,689 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2022-04-06 20:16:02,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 20:16:02,690 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-04-06 20:16:02,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:02,690 INFO L225 Difference]: With dead ends: 46 [2022-04-06 20:16:02,690 INFO L226 Difference]: Without dead ends: 36 [2022-04-06 20:16:02,691 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2022-04-06 20:16:02,691 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 20 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:02,691 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 59 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 20:16:02,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-04-06 20:16:02,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2022-04-06 20:16:02,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:02,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-04-06 20:16:02,696 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 25 [2022-04-06 20:16:02,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:02,697 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-04-06 20:16:02,697 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:02,697 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-04-06 20:16:02,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-04-06 20:16:02,697 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:02,697 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:02,731 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 20:16:02,907 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,SelfDestructingSolverStorable3 [2022-04-06 20:16:02,907 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:02,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:02,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1841134202, now seen corresponding path program 5 times [2022-04-06 20:16:02,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:02,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1106140961] [2022-04-06 20:16:02,908 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:02,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1841134202, now seen corresponding path program 6 times [2022-04-06 20:16:02,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:02,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414259428] [2022-04-06 20:16:02,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:02,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:02,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:02,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:02,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:02,995 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:02,996 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:02,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414259428] [2022-04-06 20:16:02,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [414259428] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:02,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047750271] [2022-04-06 20:16:02,996 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:16:02,996 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:02,996 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:02,997 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:02,998 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 20:16:03,263 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 20:16:03,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:03,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-06 20:16:03,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:03,368 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:03,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:16:03,492 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:03,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047750271] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:16:03,492 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:16:03,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-04-06 20:16:03,492 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:03,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1106140961] [2022-04-06 20:16:03,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1106140961] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:03,493 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:03,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 20:16:03,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287794632] [2022-04-06 20:16:03,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:03,493 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 20:16:03,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:03,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 20:16:03,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-04-06 20:16:03,495 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:03,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:03,639 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2022-04-06 20:16:03,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 20:16:03,639 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-04-06 20:16:03,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:03,640 INFO L225 Difference]: With dead ends: 52 [2022-04-06 20:16:03,640 INFO L226 Difference]: Without dead ends: 42 [2022-04-06 20:16:03,640 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=283, Unknown=0, NotChecked=0, Total=380 [2022-04-06 20:16:03,641 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 23 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:03,641 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 81 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 20:16:03,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-04-06 20:16:03,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 38. [2022-04-06 20:16:03,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:03,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2022-04-06 20:16:03,653 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 31 [2022-04-06 20:16:03,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:03,653 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2022-04-06 20:16:03,653 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:03,653 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2022-04-06 20:16:03,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-04-06 20:16:03,654 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:03,654 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:03,674 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 20:16:03,867 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:03,868 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:03,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:03,868 INFO L85 PathProgramCache]: Analyzing trace with hash 1281324674, now seen corresponding path program 7 times [2022-04-06 20:16:03,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:03,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1484478506] [2022-04-06 20:16:03,868 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:03,869 INFO L85 PathProgramCache]: Analyzing trace with hash 1281324674, now seen corresponding path program 8 times [2022-04-06 20:16:03,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:03,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383732443] [2022-04-06 20:16:03,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:03,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:03,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:03,971 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:03,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:03,976 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:03,976 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:03,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383732443] [2022-04-06 20:16:03,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383732443] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:03,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889573956] [2022-04-06 20:16:03,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:16:03,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:03,977 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:03,978 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:04,007 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 20:16:04,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:16:04,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:04,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 20:16:04,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:04,282 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:04,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:16:04,411 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:04,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889573956] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:16:04,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:16:04,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 16 [2022-04-06 20:16:04,413 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:04,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1484478506] [2022-04-06 20:16:04,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1484478506] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:04,413 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:04,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 20:16:04,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456904456] [2022-04-06 20:16:04,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:04,414 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 20:16:04,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:04,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 20:16:04,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-04-06 20:16:04,414 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:04,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:04,596 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2022-04-06 20:16:04,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 20:16:04,597 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-04-06 20:16:04,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:04,597 INFO L225 Difference]: With dead ends: 58 [2022-04-06 20:16:04,597 INFO L226 Difference]: Without dead ends: 48 [2022-04-06 20:16:04,598 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2022-04-06 20:16:04,598 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 26 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:04,598 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 107 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 20:16:04,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-04-06 20:16:04,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2022-04-06 20:16:04,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:04,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-04-06 20:16:04,604 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 37 [2022-04-06 20:16:04,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:04,604 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-04-06 20:16:04,605 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:04,605 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-04-06 20:16:04,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-04-06 20:16:04,605 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:04,605 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:04,626 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 20:16:04,825 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:04,825 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:04,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:04,825 INFO L85 PathProgramCache]: Analyzing trace with hash 935742602, now seen corresponding path program 9 times [2022-04-06 20:16:04,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:04,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1203730009] [2022-04-06 20:16:04,826 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:04,826 INFO L85 PathProgramCache]: Analyzing trace with hash 935742602, now seen corresponding path program 10 times [2022-04-06 20:16:04,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:04,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631440372] [2022-04-06 20:16:04,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:04,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:04,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:04,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:04,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:04,950 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 10 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:04,950 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:04,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631440372] [2022-04-06 20:16:04,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631440372] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:04,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534575817] [2022-04-06 20:16:04,950 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:16:04,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:04,950 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:04,951 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:04,952 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 20:16:05,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:16:05,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:05,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 667 conjuncts, 15 conjunts are in the unsatisfiable core [2022-04-06 20:16:05,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:05,263 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 10 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:05,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:16:05,412 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 10 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:05,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534575817] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:16:05,413 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:16:05,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-04-06 20:16:05,413 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:05,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1203730009] [2022-04-06 20:16:05,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1203730009] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:05,413 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:05,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 20:16:05,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198998077] [2022-04-06 20:16:05,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:05,414 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 20:16:05,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:05,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 20:16:05,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2022-04-06 20:16:05,414 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:05,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:05,626 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2022-04-06 20:16:05,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-06 20:16:05,627 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-04-06 20:16:05,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:05,627 INFO L225 Difference]: With dead ends: 64 [2022-04-06 20:16:05,627 INFO L226 Difference]: Without dead ends: 54 [2022-04-06 20:16:05,628 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=493, Unknown=0, NotChecked=0, Total=650 [2022-04-06 20:16:05,628 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 29 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:05,628 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 137 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 20:16:05,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-04-06 20:16:05,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2022-04-06 20:16:05,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:05,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-04-06 20:16:05,635 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 43 [2022-04-06 20:16:05,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:05,635 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-04-06 20:16:05,635 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:05,635 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-04-06 20:16:05,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-04-06 20:16:05,635 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:05,635 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:05,657 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 20:16:05,855 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:05,855 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:05,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:05,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1687782254, now seen corresponding path program 11 times [2022-04-06 20:16:05,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:05,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1075706594] [2022-04-06 20:16:05,856 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:05,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1687782254, now seen corresponding path program 12 times [2022-04-06 20:16:05,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:05,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920330440] [2022-04-06 20:16:05,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:05,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:05,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:06,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:06,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:06,006 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 12 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:06,006 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:06,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920330440] [2022-04-06 20:16:06,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920330440] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:06,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328714756] [2022-04-06 20:16:06,006 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:16:06,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:06,006 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:06,007 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:06,008 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 20:16:06,531 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 20:16:06,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:06,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 50 conjunts are in the unsatisfiable core [2022-04-06 20:16:06,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:07,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 20:16:07,231 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 20:16:07,232 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 11 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 47 treesize of output 67 [2022-04-06 20:16:07,504 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 24 proven. 72 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 20:16:07,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:16:08,680 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 44 proven. 46 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-04-06 20:16:08,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1328714756] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:16:08,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:16:08,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 11] total 32 [2022-04-06 20:16:08,681 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:08,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1075706594] [2022-04-06 20:16:08,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1075706594] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:08,681 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:08,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 20:16:08,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88142092] [2022-04-06 20:16:08,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:08,682 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 20:16:08,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:08,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 20:16:08,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=816, Unknown=0, NotChecked=0, Total=992 [2022-04-06 20:16:08,682 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:08,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:08,988 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2022-04-06 20:16:08,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 20:16:08,988 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2022-04-06 20:16:08,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:08,989 INFO L225 Difference]: With dead ends: 70 [2022-04-06 20:16:08,989 INFO L226 Difference]: Without dead ends: 60 [2022-04-06 20:16:08,990 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=270, Invalid=1370, Unknown=0, NotChecked=0, Total=1640 [2022-04-06 20:16:08,990 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 32 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:08,990 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 171 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 20:16:08,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-04-06 20:16:08,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2022-04-06 20:16:08,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:08,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-04-06 20:16:08,997 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 49 [2022-04-06 20:16:08,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:08,998 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-04-06 20:16:08,998 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:08,998 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-04-06 20:16:08,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-04-06 20:16:08,998 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:08,998 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:09,019 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 20:16:09,207 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:09,207 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:09,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:09,208 INFO L85 PathProgramCache]: Analyzing trace with hash -1722513766, now seen corresponding path program 13 times [2022-04-06 20:16:09,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:09,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1817547472] [2022-04-06 20:16:09,208 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:09,209 INFO L85 PathProgramCache]: Analyzing trace with hash -1722513766, now seen corresponding path program 14 times [2022-04-06 20:16:09,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:09,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155694072] [2022-04-06 20:16:09,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:09,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:09,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:09,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:09,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:09,361 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:09,361 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:09,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155694072] [2022-04-06 20:16:09,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155694072] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:09,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151916568] [2022-04-06 20:16:09,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:16:09,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:09,361 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:09,362 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:09,363 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 20:16:09,547 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:16:09,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:09,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 711 conjuncts, 19 conjunts are in the unsatisfiable core [2022-04-06 20:16:09,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:09,735 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:09,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:16:09,960 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:09,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151916568] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:16:09,960 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:16:09,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-04-06 20:16:09,961 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:09,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1817547472] [2022-04-06 20:16:09,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1817547472] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:09,961 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:09,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 20:16:09,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390579388] [2022-04-06 20:16:09,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:09,961 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 20:16:09,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:09,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 20:16:09,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2022-04-06 20:16:09,962 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:10,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:10,260 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2022-04-06 20:16:10,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 20:16:10,260 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-04-06 20:16:10,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:10,261 INFO L225 Difference]: With dead ends: 76 [2022-04-06 20:16:10,261 INFO L226 Difference]: Without dead ends: 66 [2022-04-06 20:16:10,261 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2022-04-06 20:16:10,262 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 35 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:10,262 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 209 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 20:16:10,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-04-06 20:16:10,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2022-04-06 20:16:10,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:10,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-04-06 20:16:10,269 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 55 [2022-04-06 20:16:10,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:10,269 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-04-06 20:16:10,269 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:10,269 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-04-06 20:16:10,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-04-06 20:16:10,270 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:10,270 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:10,287 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 20:16:10,479 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:10,479 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:10,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:10,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1840977246, now seen corresponding path program 15 times [2022-04-06 20:16:10,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:10,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [384490746] [2022-04-06 20:16:10,480 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:10,481 INFO L85 PathProgramCache]: Analyzing trace with hash -1840977246, now seen corresponding path program 16 times [2022-04-06 20:16:10,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:10,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994870292] [2022-04-06 20:16:10,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:10,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:10,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:10,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:10,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:10,623 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 16 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:10,623 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:10,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994870292] [2022-04-06 20:16:10,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994870292] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:10,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797724930] [2022-04-06 20:16:10,623 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:16:10,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:10,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:10,624 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:10,663 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 20:16:10,828 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:16:10,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:10,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 21 conjunts are in the unsatisfiable core [2022-04-06 20:16:10,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:11,030 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 16 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:11,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:16:11,274 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 16 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:11,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797724930] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:16:11,274 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:16:11,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 24 [2022-04-06 20:16:11,275 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:16:11,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [384490746] [2022-04-06 20:16:11,275 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [384490746] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:16:11,275 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:16:11,275 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 20:16:11,275 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689853018] [2022-04-06 20:16:11,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:16:11,275 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 20:16:11,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:11,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 20:16:11,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2022-04-06 20:16:11,276 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 13 states, 13 states have (on average 4.461538461538462) internal successors, (58), 12 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:11,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:16:11,635 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2022-04-06 20:16:11,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 20:16:11,636 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.461538461538462) internal successors, (58), 12 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2022-04-06 20:16:11,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:16:11,636 INFO L225 Difference]: With dead ends: 82 [2022-04-06 20:16:11,636 INFO L226 Difference]: Without dead ends: 72 [2022-04-06 20:16:11,637 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=277, Invalid=913, Unknown=0, NotChecked=0, Total=1190 [2022-04-06 20:16:11,638 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 38 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 20:16:11,638 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 251 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 20:16:11,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-04-06 20:16:11,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2022-04-06 20:16:11,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:11,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-04-06 20:16:11,661 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 61 [2022-04-06 20:16:11,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:16:11,662 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-04-06 20:16:11,662 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 4.461538461538462) internal successors, (58), 12 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:16:11,662 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-04-06 20:16:11,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-04-06 20:16:11,662 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:16:11,662 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:16:11,681 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 20:16:11,871 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,SelfDestructingSolverStorable9 [2022-04-06 20:16:11,873 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:16:11,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:16:11,874 INFO L85 PathProgramCache]: Analyzing trace with hash -1383323478, now seen corresponding path program 17 times [2022-04-06 20:16:11,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:16:11,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [233147074] [2022-04-06 20:16:11,874 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:16:11,874 INFO L85 PathProgramCache]: Analyzing trace with hash -1383323478, now seen corresponding path program 18 times [2022-04-06 20:16:11,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:16:11,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253333661] [2022-04-06 20:16:11,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:16:11,875 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:16:11,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:12,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:16:12,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:16:12,084 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 18 proven. 243 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:16:12,084 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:16:12,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253333661] [2022-04-06 20:16:12,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253333661] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:16:12,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580327680] [2022-04-06 20:16:12,085 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:16:12,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:16:12,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:16:12,086 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:16:12,087 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 20:16:16,454 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 20:16:16,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:16:16,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 73 conjunts are in the unsatisfiable core [2022-04-06 20:16:16,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:16:22,364 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 20:16:22,365 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 30 select indices, 30 select index equivalence classes, 406 disjoint index pairs (out of 435 index pairs), introduced 30 new quantified variables, introduced 435 case distinctions, treesize of input 215 treesize of output 439 [2022-04-06 20:17:08,501 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 50 proven. 35 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-04-06 20:17:08,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:09,655 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 18 proven. 67 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-04-06 20:17:09,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580327680] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:09,655 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:09,655 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10, 8] total 28 [2022-04-06 20:17:09,655 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:09,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [233147074] [2022-04-06 20:17:09,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [233147074] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:09,656 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:09,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-04-06 20:17:09,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157057006] [2022-04-06 20:17:09,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:09,656 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-06 20:17:09,656 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:09,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-06 20:17:09,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=635, Unknown=0, NotChecked=0, Total=756 [2022-04-06 20:17:09,657 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:10,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:10,093 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2022-04-06 20:17:10,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-04-06 20:17:10,093 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2022-04-06 20:17:10,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:10,094 INFO L225 Difference]: With dead ends: 88 [2022-04-06 20:17:10,094 INFO L226 Difference]: Without dead ends: 78 [2022-04-06 20:17:10,094 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=240, Invalid=1320, Unknown=0, NotChecked=0, Total=1560 [2022-04-06 20:17:10,095 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 41 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:10,095 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 297 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 20:17:10,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-04-06 20:17:10,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2022-04-06 20:17:10,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:10,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2022-04-06 20:17:10,103 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 67 [2022-04-06 20:17:10,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:10,103 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2022-04-06 20:17:10,103 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:10,103 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2022-04-06 20:17:10,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-04-06 20:17:10,104 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:10,104 INFO L499 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:10,115 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 20:17:10,309 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:10,309 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:10,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:10,309 INFO L85 PathProgramCache]: Analyzing trace with hash 1629405362, now seen corresponding path program 19 times [2022-04-06 20:17:10,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:10,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [472148392] [2022-04-06 20:17:10,310 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:10,310 INFO L85 PathProgramCache]: Analyzing trace with hash 1629405362, now seen corresponding path program 20 times [2022-04-06 20:17:10,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:10,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962522344] [2022-04-06 20:17:10,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:10,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:10,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:10,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:10,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:10,486 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 20 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:10,486 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:10,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962522344] [2022-04-06 20:17:10,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962522344] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:10,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602765536] [2022-04-06 20:17:10,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:17:10,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:10,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:10,488 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:17:10,489 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 20:17:10,709 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:17:10,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:10,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 25 conjunts are in the unsatisfiable core [2022-04-06 20:17:10,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:10,918 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 20 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:10,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:11,224 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 20 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:11,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602765536] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:11,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:11,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 28 [2022-04-06 20:17:11,225 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:11,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [472148392] [2022-04-06 20:17:11,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [472148392] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:11,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:11,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 20:17:11,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228305024] [2022-04-06 20:17:11,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:11,226 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 20:17:11,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:11,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 20:17:11,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=579, Unknown=0, NotChecked=0, Total=756 [2022-04-06 20:17:11,227 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 15 states, 15 states have (on average 4.666666666666667) internal successors, (70), 14 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:11,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:11,655 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2022-04-06 20:17:11,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-04-06 20:17:11,656 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.666666666666667) internal successors, (70), 14 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2022-04-06 20:17:11,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:11,656 INFO L225 Difference]: With dead ends: 94 [2022-04-06 20:17:11,656 INFO L226 Difference]: Without dead ends: 84 [2022-04-06 20:17:11,657 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=377, Invalid=1263, Unknown=0, NotChecked=0, Total=1640 [2022-04-06 20:17:11,657 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 44 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:11,660 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 347 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 20:17:11,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-04-06 20:17:11,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 80. [2022-04-06 20:17:11,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:11,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-04-06 20:17:11,669 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 73 [2022-04-06 20:17:11,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:11,671 INFO L478 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-04-06 20:17:11,671 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.666666666666667) internal successors, (70), 14 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:11,671 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-04-06 20:17:11,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-04-06 20:17:11,672 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:11,672 INFO L499 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:11,693 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-06 20:17:11,887 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,SelfDestructingSolverStorable11 [2022-04-06 20:17:11,887 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:11,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:11,888 INFO L85 PathProgramCache]: Analyzing trace with hash -107924806, now seen corresponding path program 21 times [2022-04-06 20:17:11,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:11,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1112266465] [2022-04-06 20:17:11,888 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:11,888 INFO L85 PathProgramCache]: Analyzing trace with hash -107924806, now seen corresponding path program 22 times [2022-04-06 20:17:11,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:11,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340306244] [2022-04-06 20:17:11,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:11,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:11,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:12,098 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:12,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:12,102 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 22 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:12,102 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:12,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340306244] [2022-04-06 20:17:12,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340306244] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:12,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206222438] [2022-04-06 20:17:12,102 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:17:12,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:12,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:12,103 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:17:12,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 20:17:12,317 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:17:12,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:12,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 799 conjuncts, 27 conjunts are in the unsatisfiable core [2022-04-06 20:17:12,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:12,569 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 22 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:12,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:12,927 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 22 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:12,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206222438] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:12,927 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:12,927 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 30 [2022-04-06 20:17:12,927 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:12,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1112266465] [2022-04-06 20:17:12,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1112266465] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:12,927 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:12,927 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-04-06 20:17:12,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809921132] [2022-04-06 20:17:12,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:12,928 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-04-06 20:17:12,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:12,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-04-06 20:17:12,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=666, Unknown=0, NotChecked=0, Total=870 [2022-04-06 20:17:12,929 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 16 states, 16 states have (on average 4.75) internal successors, (76), 15 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:13,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:13,449 INFO L93 Difference]: Finished difference Result 100 states and 103 transitions. [2022-04-06 20:17:13,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-04-06 20:17:13,449 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.75) internal successors, (76), 15 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-04-06 20:17:13,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:13,450 INFO L225 Difference]: With dead ends: 100 [2022-04-06 20:17:13,450 INFO L226 Difference]: Without dead ends: 90 [2022-04-06 20:17:13,450 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=433, Invalid=1459, Unknown=0, NotChecked=0, Total=1892 [2022-04-06 20:17:13,451 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 47 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 681 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 681 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:13,451 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 401 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 681 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 20:17:13,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-04-06 20:17:13,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 86. [2022-04-06 20:17:13,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:13,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2022-04-06 20:17:13,460 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 79 [2022-04-06 20:17:13,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:13,461 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2022-04-06 20:17:13,461 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.75) internal successors, (76), 15 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:13,461 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2022-04-06 20:17:13,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-04-06 20:17:13,461 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:13,461 INFO L499 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:13,479 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-06 20:17:13,675 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,SelfDestructingSolverStorable12 [2022-04-06 20:17:13,675 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:13,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:13,676 INFO L85 PathProgramCache]: Analyzing trace with hash 571997890, now seen corresponding path program 23 times [2022-04-06 20:17:13,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:13,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1269981967] [2022-04-06 20:17:13,676 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:13,676 INFO L85 PathProgramCache]: Analyzing trace with hash 571997890, now seen corresponding path program 24 times [2022-04-06 20:17:13,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:13,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880809440] [2022-04-06 20:17:13,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:13,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:13,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:13,872 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:13,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:13,878 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 24 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:13,878 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:13,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880809440] [2022-04-06 20:17:13,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880809440] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:13,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892174748] [2022-04-06 20:17:13,878 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:17:13,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:13,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:13,879 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:17:13,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 20:17:15,996 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 20:17:15,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:16,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 31 conjunts are in the unsatisfiable core [2022-04-06 20:17:16,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:16,325 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 20:17:16,325 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-04-06 20:17:16,424 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 68 proven. 47 refuted. 0 times theorem prover too weak. 341 trivial. 0 not checked. [2022-04-06 20:17:16,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:17,831 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 24 proven. 91 refuted. 0 times theorem prover too weak. 341 trivial. 0 not checked. [2022-04-06 20:17:17,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892174748] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:17,832 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:17,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10, 8] total 31 [2022-04-06 20:17:17,832 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:17,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1269981967] [2022-04-06 20:17:17,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1269981967] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:17,832 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:17,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-04-06 20:17:17,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682571478] [2022-04-06 20:17:17,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:17,833 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-04-06 20:17:17,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:17,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-04-06 20:17:17,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=777, Unknown=0, NotChecked=0, Total=930 [2022-04-06 20:17:17,833 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:18,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:18,415 INFO L93 Difference]: Finished difference Result 106 states and 109 transitions. [2022-04-06 20:17:18,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-04-06 20:17:18,416 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2022-04-06 20:17:18,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:18,416 INFO L225 Difference]: With dead ends: 106 [2022-04-06 20:17:18,416 INFO L226 Difference]: Without dead ends: 96 [2022-04-06 20:17:18,417 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=313, Invalid=1757, Unknown=0, NotChecked=0, Total=2070 [2022-04-06 20:17:18,417 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 50 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:18,418 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 459 Invalid, 817 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 20:17:18,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-04-06 20:17:18,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2022-04-06 20:17:18,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 88 states have (on average 1.0227272727272727) internal successors, (90), 88 states have internal predecessors, (90), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:18,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-04-06 20:17:18,428 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 85 [2022-04-06 20:17:18,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:18,428 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-04-06 20:17:18,428 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:18,428 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-04-06 20:17:18,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-04-06 20:17:18,428 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:18,429 INFO L499 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:18,437 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-04-06 20:17:18,631 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-06 20:17:18,631 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:18,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:18,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1820828874, now seen corresponding path program 25 times [2022-04-06 20:17:18,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:18,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [605877905] [2022-04-06 20:17:18,632 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:18,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1820828874, now seen corresponding path program 26 times [2022-04-06 20:17:18,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:18,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456615179] [2022-04-06 20:17:18,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:18,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:18,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:18,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:18,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:18,841 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 26 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:18,841 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:18,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456615179] [2022-04-06 20:17:18,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456615179] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:18,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500659108] [2022-04-06 20:17:18,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:17:18,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:18,841 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:18,842 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:17:18,857 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-04-06 20:17:19,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:17:19,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:19,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 31 conjunts are in the unsatisfiable core [2022-04-06 20:17:19,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:19,370 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 26 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:19,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:19,825 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 26 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:19,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500659108] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:19,826 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:19,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 34 [2022-04-06 20:17:19,826 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:19,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [605877905] [2022-04-06 20:17:19,826 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [605877905] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:19,826 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:19,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 20:17:19,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833748023] [2022-04-06 20:17:19,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:19,826 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 20:17:19,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:19,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 20:17:19,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=858, Unknown=0, NotChecked=0, Total=1122 [2022-04-06 20:17:19,827 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 18 states, 18 states have (on average 4.888888888888889) internal successors, (88), 17 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:20,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:20,398 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2022-04-06 20:17:20,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-04-06 20:17:20,399 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.888888888888889) internal successors, (88), 17 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2022-04-06 20:17:20,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:20,399 INFO L225 Difference]: With dead ends: 112 [2022-04-06 20:17:20,399 INFO L226 Difference]: Without dead ends: 102 [2022-04-06 20:17:20,400 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=557, Invalid=1893, Unknown=0, NotChecked=0, Total=2450 [2022-04-06 20:17:20,400 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 53 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:20,401 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 521 Invalid, 935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 20:17:20,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-04-06 20:17:20,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 98. [2022-04-06 20:17:20,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 states have internal predecessors, (96), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:20,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2022-04-06 20:17:20,412 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 91 [2022-04-06 20:17:20,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:20,412 INFO L478 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2022-04-06 20:17:20,412 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.888888888888889) internal successors, (88), 17 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:20,412 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2022-04-06 20:17:20,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-04-06 20:17:20,412 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:20,412 INFO L499 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:20,432 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-04-06 20:17:20,627 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,SelfDestructingSolverStorable14 [2022-04-06 20:17:20,628 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:20,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:20,628 INFO L85 PathProgramCache]: Analyzing trace with hash -648764206, now seen corresponding path program 27 times [2022-04-06 20:17:20,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:20,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [451142260] [2022-04-06 20:17:20,628 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:20,629 INFO L85 PathProgramCache]: Analyzing trace with hash -648764206, now seen corresponding path program 28 times [2022-04-06 20:17:20,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:20,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324565749] [2022-04-06 20:17:20,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:20,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:20,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:20,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:20,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:20,864 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 28 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:20,865 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:20,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324565749] [2022-04-06 20:17:20,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324565749] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:20,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606644112] [2022-04-06 20:17:20,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:17:20,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:20,865 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:20,866 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:17:20,867 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-04-06 20:17:21,125 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:17:21,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:21,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 865 conjuncts, 33 conjunts are in the unsatisfiable core [2022-04-06 20:17:21,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:21,430 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 28 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:21,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:21,914 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 28 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:21,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606644112] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:21,914 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:21,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 36 [2022-04-06 20:17:21,914 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:21,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [451142260] [2022-04-06 20:17:21,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [451142260] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:21,914 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:21,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-04-06 20:17:21,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429111051] [2022-04-06 20:17:21,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:21,915 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-04-06 20:17:21,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:21,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-04-06 20:17:21,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=963, Unknown=0, NotChecked=0, Total=1260 [2022-04-06 20:17:21,915 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 18 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:22,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:22,544 INFO L93 Difference]: Finished difference Result 118 states and 121 transitions. [2022-04-06 20:17:22,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-04-06 20:17:22,544 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 18 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2022-04-06 20:17:22,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:22,545 INFO L225 Difference]: With dead ends: 118 [2022-04-06 20:17:22,545 INFO L226 Difference]: Without dead ends: 108 [2022-04-06 20:17:22,546 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=625, Invalid=2131, Unknown=0, NotChecked=0, Total=2756 [2022-04-06 20:17:22,546 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 56 mSDsluCounter, 547 mSDsCounter, 0 mSdLazyCounter, 1029 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 587 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:22,546 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 587 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1029 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 20:17:22,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-04-06 20:17:22,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 104. [2022-04-06 20:17:22,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 100 states have (on average 1.02) internal successors, (102), 100 states have internal predecessors, (102), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:22,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-04-06 20:17:22,559 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 97 [2022-04-06 20:17:22,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:22,559 INFO L478 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-04-06 20:17:22,559 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 18 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:22,559 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-04-06 20:17:22,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-04-06 20:17:22,559 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:22,559 INFO L499 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:22,577 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-04-06 20:17:22,763 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:22,763 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:22,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:22,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1603501786, now seen corresponding path program 29 times [2022-04-06 20:17:22,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:22,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [841986717] [2022-04-06 20:17:22,764 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:22,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1603501786, now seen corresponding path program 30 times [2022-04-06 20:17:22,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:22,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117187715] [2022-04-06 20:17:22,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:22,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:22,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:23,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:23,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:23,034 INFO L134 CoverageAnalysis]: Checked inductivity of 705 backedges. 30 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:23,034 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:23,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117187715] [2022-04-06 20:17:23,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117187715] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:23,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346746672] [2022-04-06 20:17:23,034 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:17:23,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:23,034 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:23,035 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:17:23,036 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-04-06 20:17:25,643 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 20:17:25,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:25,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 23 conjunts are in the unsatisfiable core [2022-04-06 20:17:25,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:26,012 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 20:17:26,012 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-04-06 20:17:26,121 INFO L134 CoverageAnalysis]: Checked inductivity of 705 backedges. 86 proven. 59 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2022-04-06 20:17:26,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:27,780 INFO L134 CoverageAnalysis]: Checked inductivity of 705 backedges. 30 proven. 115 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2022-04-06 20:17:27,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346746672] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:27,780 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:27,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 8, 8] total 32 [2022-04-06 20:17:27,781 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:27,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [841986717] [2022-04-06 20:17:27,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [841986717] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:27,781 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:27,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-04-06 20:17:27,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486804851] [2022-04-06 20:17:27,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:27,781 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-04-06 20:17:27,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:27,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-04-06 20:17:27,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=819, Unknown=0, NotChecked=0, Total=992 [2022-04-06 20:17:27,782 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 20 states, 20 states have (on average 5.0) internal successors, (100), 19 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:28,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:28,500 INFO L93 Difference]: Finished difference Result 124 states and 127 transitions. [2022-04-06 20:17:28,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-04-06 20:17:28,501 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.0) internal successors, (100), 19 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2022-04-06 20:17:28,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:28,501 INFO L225 Difference]: With dead ends: 124 [2022-04-06 20:17:28,501 INFO L226 Difference]: Without dead ends: 114 [2022-04-06 20:17:28,502 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=366, Invalid=2084, Unknown=0, NotChecked=0, Total=2450 [2022-04-06 20:17:28,502 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 59 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 1161 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 657 SdHoareTripleChecker+Invalid, 1195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:28,503 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 657 Invalid, 1195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1161 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 20:17:28,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-04-06 20:17:28,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 110. [2022-04-06 20:17:28,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:28,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2022-04-06 20:17:28,516 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 103 [2022-04-06 20:17:28,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:28,516 INFO L478 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2022-04-06 20:17:28,516 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.0) internal successors, (100), 19 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:28,516 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2022-04-06 20:17:28,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-04-06 20:17:28,517 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:28,517 INFO L499 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:28,539 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-04-06 20:17:28,718 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-04-06 20:17:28,719 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:28,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:28,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1962455778, now seen corresponding path program 31 times [2022-04-06 20:17:28,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:28,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [833621387] [2022-04-06 20:17:28,720 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:28,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1962455778, now seen corresponding path program 32 times [2022-04-06 20:17:28,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:28,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803859030] [2022-04-06 20:17:28,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:28,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:28,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:28,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:28,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:29,009 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 32 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:29,010 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:29,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803859030] [2022-04-06 20:17:29,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803859030] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:29,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260625269] [2022-04-06 20:17:29,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:17:29,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:29,010 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:29,024 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:17:29,024 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-04-06 20:17:29,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:17:29,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:29,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 909 conjuncts, 37 conjunts are in the unsatisfiable core [2022-04-06 20:17:29,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:29,596 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 32 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:29,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:30,228 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 32 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:30,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260625269] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:30,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:30,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 40 [2022-04-06 20:17:30,229 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:30,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [833621387] [2022-04-06 20:17:30,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [833621387] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:30,229 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:30,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-04-06 20:17:30,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028458473] [2022-04-06 20:17:30,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:30,230 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-04-06 20:17:30,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:30,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-04-06 20:17:30,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=1191, Unknown=0, NotChecked=0, Total=1560 [2022-04-06 20:17:30,231 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 20 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:31,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:31,011 INFO L93 Difference]: Finished difference Result 130 states and 133 transitions. [2022-04-06 20:17:31,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-04-06 20:17:31,011 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 20 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2022-04-06 20:17:31,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:31,011 INFO L225 Difference]: With dead ends: 130 [2022-04-06 20:17:31,012 INFO L226 Difference]: Without dead ends: 120 [2022-04-06 20:17:31,012 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 200 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=773, Invalid=2649, Unknown=0, NotChecked=0, Total=3422 [2022-04-06 20:17:31,013 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 62 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 1301 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 731 SdHoareTripleChecker+Invalid, 1337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 1301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:31,013 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 731 Invalid, 1337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 1301 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 20:17:31,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-04-06 20:17:31,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 116. [2022-04-06 20:17:31,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 112 states have (on average 1.0178571428571428) internal successors, (114), 112 states have internal predecessors, (114), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:31,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 117 transitions. [2022-04-06 20:17:31,027 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 117 transitions. Word has length 109 [2022-04-06 20:17:31,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:31,028 INFO L478 AbstractCegarLoop]: Abstraction has 116 states and 117 transitions. [2022-04-06 20:17:31,028 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 20 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:31,028 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 117 transitions. [2022-04-06 20:17:31,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-04-06 20:17:31,028 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:31,028 INFO L499 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:31,046 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-04-06 20:17:31,229 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,SelfDestructingSolverStorable17 [2022-04-06 20:17:31,229 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:31,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:31,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1780956950, now seen corresponding path program 33 times [2022-04-06 20:17:31,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:31,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [209927553] [2022-04-06 20:17:31,230 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:31,230 INFO L85 PathProgramCache]: Analyzing trace with hash -1780956950, now seen corresponding path program 34 times [2022-04-06 20:17:31,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:31,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815666663] [2022-04-06 20:17:31,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:31,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:31,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:31,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:31,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:31,501 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 34 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:31,501 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:31,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815666663] [2022-04-06 20:17:31,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815666663] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:31,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813276171] [2022-04-06 20:17:31,502 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:17:31,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:31,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:31,503 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) [2022-04-06 20:17:31,532 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-04-06 20:17:31,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:17:31,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:31,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 931 conjuncts, 39 conjunts are in the unsatisfiable core [2022-04-06 20:17:31,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:32,106 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 34 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:32,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:17:32,791 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 34 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:32,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813276171] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:17:32,792 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:17:32,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 42 [2022-04-06 20:17:32,792 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:17:32,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [209927553] [2022-04-06 20:17:32,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [209927553] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:17:32,792 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:17:32,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-04-06 20:17:32,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169032676] [2022-04-06 20:17:32,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:17:32,793 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-04-06 20:17:32,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:32,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-04-06 20:17:32,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=1314, Unknown=0, NotChecked=0, Total=1722 [2022-04-06 20:17:32,793 INFO L87 Difference]: Start difference. First operand 116 states and 117 transitions. Second operand has 22 states, 22 states have (on average 5.090909090909091) internal successors, (112), 21 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:33,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:17:33,628 INFO L93 Difference]: Finished difference Result 136 states and 139 transitions. [2022-04-06 20:17:33,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-04-06 20:17:33,628 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.090909090909091) internal successors, (112), 21 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2022-04-06 20:17:33,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:17:33,629 INFO L225 Difference]: With dead ends: 136 [2022-04-06 20:17:33,629 INFO L226 Difference]: Without dead ends: 126 [2022-04-06 20:17:33,630 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 211 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=853, Invalid=2929, Unknown=0, NotChecked=0, Total=3782 [2022-04-06 20:17:33,630 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 65 mSDsluCounter, 763 mSDsCounter, 0 mSdLazyCounter, 1449 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 1487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-04-06 20:17:33,631 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 809 Invalid, 1487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1449 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-04-06 20:17:33,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-04-06 20:17:33,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 122. [2022-04-06 20:17:33,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:33,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2022-04-06 20:17:33,647 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 115 [2022-04-06 20:17:33,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:17:33,647 INFO L478 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2022-04-06 20:17:33,647 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.090909090909091) internal successors, (112), 21 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 20:17:33,647 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2022-04-06 20:17:33,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-04-06 20:17:33,648 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:17:33,648 INFO L499 BasicCegarLoop]: trace histogram [19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 20:17:33,665 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-04-06 20:17:33,851 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:33,852 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:17:33,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:17:33,852 INFO L85 PathProgramCache]: Analyzing trace with hash -853006094, now seen corresponding path program 35 times [2022-04-06 20:17:33,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:17:33,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1915319307] [2022-04-06 20:17:33,852 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:17:33,853 INFO L85 PathProgramCache]: Analyzing trace with hash -853006094, now seen corresponding path program 36 times [2022-04-06 20:17:33,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:17:33,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738216595] [2022-04-06 20:17:33,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:17:33,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:17:33,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:34,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:17:34,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:17:34,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 36 proven. 972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 20:17:34,176 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:17:34,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738216595] [2022-04-06 20:17:34,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738216595] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:17:34,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560462282] [2022-04-06 20:17:34,176 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:17:34,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:17:34,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:17:34,177 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) [2022-04-06 20:17:34,178 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-04-06 20:17:34,646 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 20:17:34,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:17:34,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 19 conjunts are in the unsatisfiable core [2022-04-06 20:17:34,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:17:34,888 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 20:17:34,889 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23