/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/nla-digbench-scaling/hard2_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 23:16:57,595 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 23:16:57,606 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 23:16:57,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-06 23:16:57,662 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-06 23:16:57,664 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-06 23:16:57,669 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-06 23:16:57,675 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-06 23:16:57,678 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-06 23:16:57,684 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-06 23:16:57,684 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-06 23:16:57,685 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-06 23:16:57,685 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 23:16:57,687 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 23:16:57,688 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 23:16:57,689 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 23:16:57,690 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 23:16:57,692 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 23:16:57,696 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 23:16:57,698 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 23:16:57,699 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 23:16:57,701 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 23:16:57,702 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 23:16:57,703 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 23:16:57,704 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 23:16:57,711 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-04-06 23:16:57,711 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-04-06 23:16:57,711 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-04-06 23:16:57,712 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-04-06 23:16:57,712 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-04-06 23:16:57,714 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-04-06 23:16:57,714 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-04-06 23:16:57,716 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-04-06 23:16:57,716 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-04-06 23:16:57,717 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-04-06 23:16:57,717 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-04-06 23:16:57,717 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-04-06 23:16:57,718 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-04-06 23:16:57,718 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-04-06 23:16:57,718 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 23:16:57,719 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 23:16:57,721 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 23:16:57,721 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 23:16:57,736 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 23:16:57,736 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 23:16:57,737 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 23:16:57,738 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 23:16:57,738 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 23:16:57,738 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 23:16:57,738 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 23:16:57,738 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 23:16:57,738 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 23:16:57,739 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 23:16:57,739 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 23:16:57,740 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 23:16:57,740 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 23:16:57,740 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 23:16:57,740 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 23:16:57,740 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 23:16:57,740 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 23:16:57,740 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 23:16:57,741 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 23:16:57,741 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 23:16:57,741 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 23:16:57,741 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-04-06 23:16:57,741 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 23:16:57,962 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 23:16:57,980 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 23:16:57,982 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 23:16:57,983 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 23:16:57,984 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 23:16:57,985 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound10.c [2022-04-06 23:16:58,041 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2eb4ff13/b8781de9958246c699e629ba0040f433/FLAGa35cfe537 [2022-04-06 23:16:58,517 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 23:16:58,517 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound10.c [2022-04-06 23:16:58,525 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2eb4ff13/b8781de9958246c699e629ba0040f433/FLAGa35cfe537 [2022-04-06 23:16:58,549 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2eb4ff13/b8781de9958246c699e629ba0040f433 [2022-04-06 23:16:58,551 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 23:16:58,553 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 23:16:58,555 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 23:16:58,555 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 23:16:58,559 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 23:16:58,560 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,561 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3100128e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58, skipping insertion in model container [2022-04-06 23:16:58,562 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,569 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 23:16:58,586 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 23:16:58,723 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound10.c[526,539] [2022-04-06 23:16:58,736 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 23:16:58,742 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 23:16:58,753 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound10.c[526,539] [2022-04-06 23:16:58,761 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 23:16:58,774 INFO L208 MainTranslator]: Completed translation [2022-04-06 23:16:58,774 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58 WrapperNode [2022-04-06 23:16:58,774 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 23:16:58,775 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 23:16:58,775 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 23:16:58,775 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 23:16:58,786 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,786 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,792 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,792 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,806 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,809 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,810 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,812 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 23:16:58,813 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 23:16:58,813 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 23:16:58,813 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 23:16:58,814 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (1/1) ... [2022-04-06 23:16:58,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 23:16:58,829 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:16:58,840 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 23:16:58,863 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 23:16:58,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 23:16:58,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 23:16:58,884 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 23:16:58,884 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 23:16:58,884 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 23:16:58,884 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 23:16:58,884 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 23:16:58,884 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 23:16:58,884 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 23:16:58,884 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 23:16:58,884 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 23:16:58,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 23:16:58,944 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 23:16:58,945 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 23:16:59,112 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 23:16:59,117 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 23:16:59,118 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 23:16:59,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 11:16:59 BoogieIcfgContainer [2022-04-06 23:16:59,119 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 23:16:59,121 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 23:16:59,121 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 23:16:59,124 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 23:16:59,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 11:16:58" (1/3) ... [2022-04-06 23:16:59,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@239cc628 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 11:16:59, skipping insertion in model container [2022-04-06 23:16:59,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 11:16:58" (2/3) ... [2022-04-06 23:16:59,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@239cc628 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 11:16:59, skipping insertion in model container [2022-04-06 23:16:59,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 11:16:59" (3/3) ... [2022-04-06 23:16:59,127 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound10.c [2022-04-06 23:16:59,134 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 23:16:59,134 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 23:16:59,210 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 23:16:59,222 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 23:16:59,223 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 23:16:59,242 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-04-06 23:16:59,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 23:16:59,262 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:16:59,263 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:16:59,263 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:16:59,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:16:59,269 INFO L85 PathProgramCache]: Analyzing trace with hash -1682617676, now seen corresponding path program 1 times [2022-04-06 23:16:59,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:16:59,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2038404150] [2022-04-06 23:16:59,291 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 23:16:59,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1682617676, now seen corresponding path program 2 times [2022-04-06 23:16:59,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:16:59,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915245092] [2022-04-06 23:16:59,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:16:59,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:16:59,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:16:59,471 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 23:16:59,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:16:59,500 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 23:16:59,501 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:16:59,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915245092] [2022-04-06 23:16:59,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915245092] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:16:59,502 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:16:59,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 23:16:59,504 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:16:59,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2038404150] [2022-04-06 23:16:59,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2038404150] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:16:59,505 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:16:59,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 23:16:59,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56497162] [2022-04-06 23:16:59,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:16:59,509 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 23:16:59,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:16:59,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 23:16:59,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 23:16:59,542 INFO L87 Difference]: Start difference. First operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 23:16:59,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:16:59,660 INFO L93 Difference]: Finished difference Result 57 states and 91 transitions. [2022-04-06 23:16:59,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 23:16:59,664 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-06 23:16:59,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:16:59,669 INFO L225 Difference]: With dead ends: 57 [2022-04-06 23:16:59,670 INFO L226 Difference]: Without dead ends: 27 [2022-04-06 23:16:59,672 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 23:16:59,678 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 6 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 23:16:59,680 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 44 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 23:16:59,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-04-06 23:16:59,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2022-04-06 23:16:59,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 23:16:59,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2022-04-06 23:16:59,713 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 12 [2022-04-06 23:16:59,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:16:59,713 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2022-04-06 23:16:59,713 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 23:16:59,714 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2022-04-06 23:16:59,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 23:16:59,714 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:16:59,714 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:16:59,715 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 23:16:59,715 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:16:59,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:16:59,716 INFO L85 PathProgramCache]: Analyzing trace with hash -2144676086, now seen corresponding path program 1 times [2022-04-06 23:16:59,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:16:59,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1001384132] [2022-04-06 23:16:59,716 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 23:16:59,717 INFO L85 PathProgramCache]: Analyzing trace with hash -2144676086, now seen corresponding path program 2 times [2022-04-06 23:16:59,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:16:59,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452589272] [2022-04-06 23:16:59,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:16:59,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:16:59,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:16:59,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 23:16:59,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:16:59,793 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 23:16:59,794 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:16:59,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452589272] [2022-04-06 23:16:59,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452589272] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:16:59,794 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:16:59,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 23:16:59,795 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:16:59,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1001384132] [2022-04-06 23:16:59,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1001384132] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:16:59,795 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:16:59,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 23:16:59,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037788480] [2022-04-06 23:16:59,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:16:59,796 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 23:16:59,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:16:59,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 23:16:59,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 23:16:59,797 INFO L87 Difference]: Start difference. First operand 26 states and 36 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 23:16:59,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:16:59,925 INFO L93 Difference]: Finished difference Result 41 states and 56 transitions. [2022-04-06 23:16:59,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 23:16:59,925 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-06 23:16:59,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:16:59,927 INFO L225 Difference]: With dead ends: 41 [2022-04-06 23:16:59,927 INFO L226 Difference]: Without dead ends: 39 [2022-04-06 23:16:59,927 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-04-06 23:16:59,928 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 24 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 23:16:59,929 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 85 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 23:16:59,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-04-06 23:16:59,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 30. [2022-04-06 23:16:59,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 23:16:59,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-04-06 23:16:59,958 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 12 [2022-04-06 23:16:59,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:16:59,959 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-04-06 23:16:59,959 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 23:16:59,959 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-04-06 23:16:59,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-06 23:16:59,960 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:16:59,960 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:16:59,960 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 23:16:59,960 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:16:59,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:16:59,961 INFO L85 PathProgramCache]: Analyzing trace with hash 1842794081, now seen corresponding path program 1 times [2022-04-06 23:16:59,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:16:59,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1337566167] [2022-04-06 23:16:59,961 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 23:16:59,962 INFO L85 PathProgramCache]: Analyzing trace with hash 1842794081, now seen corresponding path program 2 times [2022-04-06 23:16:59,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:16:59,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788361260] [2022-04-06 23:16:59,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:16:59,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:16:59,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:17:00,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 23:17:00,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:17:00,065 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 23:17:00,065 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:00,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788361260] [2022-04-06 23:17:00,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788361260] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:00,066 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:00,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 23:17:00,066 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:00,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1337566167] [2022-04-06 23:17:00,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1337566167] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:00,067 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:00,067 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 23:17:00,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274817536] [2022-04-06 23:17:00,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:00,067 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 23:17:00,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:00,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 23:17:00,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 23:17:00,069 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 23:17:00,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:00,194 INFO L93 Difference]: Finished difference Result 46 states and 61 transitions. [2022-04-06 23:17:00,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 23:17:00,194 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-04-06 23:17:00,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:00,195 INFO L225 Difference]: With dead ends: 46 [2022-04-06 23:17:00,195 INFO L226 Difference]: Without dead ends: 32 [2022-04-06 23:17:00,196 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 23:17:00,197 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 6 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:00,197 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 73 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 23:17:00,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-04-06 23:17:00,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-04-06 23:17:00,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 23:17:00,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2022-04-06 23:17:00,205 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2022-04-06 23:17:00,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:00,206 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2022-04-06 23:17:00,206 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 23:17:00,206 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2022-04-06 23:17:00,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 23:17:00,206 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:00,207 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:00,207 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-06 23:17:00,211 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:00,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:00,212 INFO L85 PathProgramCache]: Analyzing trace with hash 311129497, now seen corresponding path program 1 times [2022-04-06 23:17:00,212 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:00,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2074801744] [2022-04-06 23:17:00,218 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 23:17:00,218 INFO L85 PathProgramCache]: Analyzing trace with hash 311129497, now seen corresponding path program 2 times [2022-04-06 23:17:00,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:00,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308610641] [2022-04-06 23:17:00,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:00,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:00,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:17:00,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 23:17:00,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:17:00,293 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-04-06 23:17:00,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 23:17:00,299 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 23:17:00,299 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:00,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308610641] [2022-04-06 23:17:00,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308610641] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:00,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:00,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 23:17:00,300 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:00,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2074801744] [2022-04-06 23:17:00,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2074801744] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:00,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:00,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 23:17:00,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622321106] [2022-04-06 23:17:00,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:00,301 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 23:17:00,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:00,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 23:17:00,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 23:17:00,301 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 23:17:00,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:00,467 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-04-06 23:17:00,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 23:17:00,468 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2022-04-06 23:17:00,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:00,471 INFO L225 Difference]: With dead ends: 46 [2022-04-06 23:17:00,471 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 23:17:00,472 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-04-06 23:17:00,483 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 19 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:00,485 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 78 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 23:17:00,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 23:17:00,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2022-04-06 23:17:00,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 23:17:00,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2022-04-06 23:17:00,504 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 17 [2022-04-06 23:17:00,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:00,504 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2022-04-06 23:17:00,505 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 23:17:00,505 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2022-04-06 23:17:00,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-04-06 23:17:00,505 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:00,505 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:00,506 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-04-06 23:17:00,506 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:00,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:00,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1912623062, now seen corresponding path program 1 times [2022-04-06 23:17:00,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:00,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1053435939] [2022-04-06 23:17:00,507 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 23:17:00,507 INFO L85 PathProgramCache]: Analyzing trace with hash -1912623062, now seen corresponding path program 2 times [2022-04-06 23:17:00,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:00,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725222216] [2022-04-06 23:17:00,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:00,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:00,519 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:00,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [715165146] [2022-04-06 23:17:00,519 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 23:17:00,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:00,520 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:00,521 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 23:17:00,533 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 23:17:00,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 23:17:00,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:00,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 23:17:00,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:00,720 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 23:17:00,720 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 23:17:00,720 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:00,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725222216] [2022-04-06 23:17:00,721 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:00,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715165146] [2022-04-06 23:17:00,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715165146] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:00,721 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:00,721 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 23:17:00,722 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:00,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1053435939] [2022-04-06 23:17:00,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1053435939] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:00,722 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:00,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 23:17:00,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346961086] [2022-04-06 23:17:00,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:00,723 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 23:17:00,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:00,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 23:17:00,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 23:17:00,724 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 23:17:00,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:00,791 INFO L93 Difference]: Finished difference Result 65 states and 87 transitions. [2022-04-06 23:17:00,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 23:17:00,792 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2022-04-06 23:17:00,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:00,793 INFO L225 Difference]: With dead ends: 65 [2022-04-06 23:17:00,793 INFO L226 Difference]: Without dead ends: 50 [2022-04-06 23:17:00,794 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 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 23:17:00,794 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 10 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:00,795 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 121 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 23:17:00,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-04-06 23:17:00,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-04-06 23:17:00,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 31 states have internal predecessors, (37), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 23:17:00,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2022-04-06 23:17:00,805 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 22 [2022-04-06 23:17:00,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:00,805 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2022-04-06 23:17:00,805 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 23:17:00,806 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2022-04-06 23:17:00,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-04-06 23:17:00,806 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:00,806 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:00,842 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 23:17:01,035 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:01,036 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:01,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:01,036 INFO L85 PathProgramCache]: Analyzing trace with hash 214651490, now seen corresponding path program 1 times [2022-04-06 23:17:01,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:01,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1219127303] [2022-04-06 23:17:01,037 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 23:17:01,037 INFO L85 PathProgramCache]: Analyzing trace with hash 214651490, now seen corresponding path program 2 times [2022-04-06 23:17:01,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:01,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378944057] [2022-04-06 23:17:01,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:01,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:01,046 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:01,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [803141533] [2022-04-06 23:17:01,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 23:17:01,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:01,047 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:01,048 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 23:17:01,065 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 23:17:01,090 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 23:17:01,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:01,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 23:17:01,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:01,168 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 23:17:01,169 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 23:17:01,169 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:01,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378944057] [2022-04-06 23:17:01,169 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:01,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803141533] [2022-04-06 23:17:01,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803141533] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:01,169 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:01,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 23:17:01,170 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:01,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1219127303] [2022-04-06 23:17:01,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1219127303] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:01,170 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:01,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 23:17:01,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839690243] [2022-04-06 23:17:01,170 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:01,171 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 23:17:01,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:01,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 23:17:01,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-06 23:17:01,172 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 23:17:01,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:01,201 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2022-04-06 23:17:01,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 23:17:01,202 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2022-04-06 23:17:01,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:01,203 INFO L225 Difference]: With dead ends: 70 [2022-04-06 23:17:01,203 INFO L226 Difference]: Without dead ends: 63 [2022-04-06 23:17:01,203 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-06 23:17:01,204 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 3 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:01,204 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 124 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 23:17:01,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-04-06 23:17:01,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-04-06 23:17:01,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 23:17:01,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2022-04-06 23:17:01,215 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 30 [2022-04-06 23:17:01,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:01,215 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2022-04-06 23:17:01,215 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 23:17:01,215 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2022-04-06 23:17:01,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-04-06 23:17:01,216 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:01,216 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:01,246 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 23:17:01,443 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,SelfDestructingSolverStorable5 [2022-04-06 23:17:01,444 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:01,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:01,444 INFO L85 PathProgramCache]: Analyzing trace with hash 216379368, now seen corresponding path program 1 times [2022-04-06 23:17:01,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:01,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2145994805] [2022-04-06 23:17:01,445 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 23:17:01,445 INFO L85 PathProgramCache]: Analyzing trace with hash 216379368, now seen corresponding path program 2 times [2022-04-06 23:17:01,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:01,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158650783] [2022-04-06 23:17:01,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:01,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:01,456 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:01,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [663513163] [2022-04-06 23:17:01,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 23:17:01,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:01,457 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:01,470 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 23:17:01,489 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 23:17:01,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 23:17:01,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:01,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 23:17:01,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:01,645 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 23:17:01,645 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 23:17:01,645 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:01,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158650783] [2022-04-06 23:17:01,646 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:01,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663513163] [2022-04-06 23:17:01,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663513163] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:01,646 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:01,646 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 23:17:01,646 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:01,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2145994805] [2022-04-06 23:17:01,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2145994805] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:01,647 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:01,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 23:17:01,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354190050] [2022-04-06 23:17:01,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:01,647 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 23:17:01,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:01,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 23:17:01,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 23:17:01,648 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 23:17:01,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:01,707 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2022-04-06 23:17:01,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 23:17:01,707 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2022-04-06 23:17:01,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:01,712 INFO L225 Difference]: With dead ends: 76 [2022-04-06 23:17:01,712 INFO L226 Difference]: Without dead ends: 64 [2022-04-06 23:17:01,713 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 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 23:17:01,713 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 11 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:01,714 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 95 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 23:17:01,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-04-06 23:17:01,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2022-04-06 23:17:01,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-06 23:17:01,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2022-04-06 23:17:01,737 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 30 [2022-04-06 23:17:01,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:01,738 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2022-04-06 23:17:01,738 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 23:17:01,738 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2022-04-06 23:17:01,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-04-06 23:17:01,746 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:01,746 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:01,775 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 23:17:01,975 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:01,976 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:01,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:01,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1255015940, now seen corresponding path program 1 times [2022-04-06 23:17:01,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:01,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [476013089] [2022-04-06 23:17:01,996 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 23:17:01,997 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 23:17:01,997 INFO L85 PathProgramCache]: Analyzing trace with hash -1255015940, now seen corresponding path program 2 times [2022-04-06 23:17:01,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:01,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468692615] [2022-04-06 23:17:01,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:01,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:02,013 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:02,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1533497604] [2022-04-06 23:17:02,014 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 23:17:02,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:02,014 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:02,015 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 23:17:02,033 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 23:17:02,068 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 23:17:02,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:02,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 23:17:02,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:02,193 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-04-06 23:17:02,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 23:17:02,304 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 23:17:02,305 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:02,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468692615] [2022-04-06 23:17:02,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:02,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533497604] [2022-04-06 23:17:02,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533497604] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 23:17:02,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 23:17:02,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-04-06 23:17:02,306 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:02,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [476013089] [2022-04-06 23:17:02,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [476013089] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:02,306 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:02,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 23:17:02,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589079451] [2022-04-06 23:17:02,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:02,307 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 23:17:02,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:02,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 23:17:02,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-04-06 23:17:02,308 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-04-06 23:17:02,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:02,350 INFO L93 Difference]: Finished difference Result 90 states and 114 transitions. [2022-04-06 23:17:02,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 23:17:02,350 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 37 [2022-04-06 23:17:02,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:02,354 INFO L225 Difference]: With dead ends: 90 [2022-04-06 23:17:02,354 INFO L226 Difference]: Without dead ends: 65 [2022-04-06 23:17:02,357 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-04-06 23:17:02,357 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 2 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:02,358 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 126 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 23:17:02,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-04-06 23:17:02,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-04-06 23:17:02,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 43 states have internal predecessors, (50), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-06 23:17:02,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-04-06 23:17:02,385 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 37 [2022-04-06 23:17:02,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:02,386 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-04-06 23:17:02,386 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-04-06 23:17:02,387 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-04-06 23:17:02,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-04-06 23:17:02,388 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:02,388 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:02,418 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 23:17:02,607 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:02,608 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:02,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:02,608 INFO L85 PathProgramCache]: Analyzing trace with hash -1057559728, now seen corresponding path program 1 times [2022-04-06 23:17:02,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:02,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [156150573] [2022-04-06 23:17:02,613 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 23:17:02,613 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 23:17:02,614 INFO L85 PathProgramCache]: Analyzing trace with hash -1057559728, now seen corresponding path program 2 times [2022-04-06 23:17:02,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:02,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325675253] [2022-04-06 23:17:02,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:02,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:02,623 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:02,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [216990383] [2022-04-06 23:17:02,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 23:17:02,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:02,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:02,624 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 23:17:02,655 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 23:17:02,677 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 23:17:02,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:02,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 23:17:02,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:02,831 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-04-06 23:17:02,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 23:17:02,935 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-04-06 23:17:02,935 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:02,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325675253] [2022-04-06 23:17:02,936 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:02,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216990383] [2022-04-06 23:17:02,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216990383] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 23:17:02,936 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 23:17:02,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-04-06 23:17:02,936 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:02,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [156150573] [2022-04-06 23:17:02,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [156150573] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:02,937 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:02,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 23:17:02,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49965884] [2022-04-06 23:17:02,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:02,937 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 23:17:02,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:02,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 23:17:02,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-04-06 23:17:02,938 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 23:17:02,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:02,986 INFO L93 Difference]: Finished difference Result 78 states and 95 transitions. [2022-04-06 23:17:02,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 23:17:02,986 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 40 [2022-04-06 23:17:02,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:02,987 INFO L225 Difference]: With dead ends: 78 [2022-04-06 23:17:02,987 INFO L226 Difference]: Without dead ends: 76 [2022-04-06 23:17:02,988 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-06 23:17:02,988 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 11 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:02,988 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 103 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 23:17:02,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-04-06 23:17:02,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2022-04-06 23:17:02,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 46 states have (on average 1.2173913043478262) internal successors, (56), 49 states have internal predecessors, (56), 17 states have call successors, (17), 10 states have call predecessors, (17), 9 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2022-04-06 23:17:02,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2022-04-06 23:17:02,999 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 40 [2022-04-06 23:17:02,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:02,999 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2022-04-06 23:17:02,999 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 23:17:02,999 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2022-04-06 23:17:03,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-04-06 23:17:03,001 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:03,001 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:03,029 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 23:17:03,223 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:03,224 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:03,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:03,224 INFO L85 PathProgramCache]: Analyzing trace with hash 529029787, now seen corresponding path program 1 times [2022-04-06 23:17:03,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:03,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1959851041] [2022-04-06 23:17:03,228 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 23:17:03,228 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 23:17:03,228 INFO L85 PathProgramCache]: Analyzing trace with hash 529029787, now seen corresponding path program 2 times [2022-04-06 23:17:03,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:03,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075090148] [2022-04-06 23:17:03,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:03,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:03,236 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:03,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1144367395] [2022-04-06 23:17:03,236 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 23:17:03,236 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:03,236 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:03,241 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 23:17:03,242 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 23:17:03,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 23:17:03,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:03,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 23:17:03,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:03,412 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-04-06 23:17:03,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 23:17:03,544 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-04-06 23:17:03,544 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:03,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075090148] [2022-04-06 23:17:03,545 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:03,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144367395] [2022-04-06 23:17:03,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144367395] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 23:17:03,545 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 23:17:03,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-04-06 23:17:03,545 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:03,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1959851041] [2022-04-06 23:17:03,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1959851041] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:03,546 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:03,546 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 23:17:03,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292710714] [2022-04-06 23:17:03,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:03,546 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 23:17:03,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:03,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 23:17:03,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-06 23:17:03,547 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-04-06 23:17:03,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:03,591 INFO L93 Difference]: Finished difference Result 104 states and 120 transitions. [2022-04-06 23:17:03,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 23:17:03,591 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2022-04-06 23:17:03,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:03,592 INFO L225 Difference]: With dead ends: 104 [2022-04-06 23:17:03,592 INFO L226 Difference]: Without dead ends: 92 [2022-04-06 23:17:03,593 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-06 23:17:03,593 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 6 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:03,594 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 117 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 23:17:03,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-04-06 23:17:03,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2022-04-06 23:17:03,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 58 states have (on average 1.1896551724137931) internal successors, (69), 61 states have internal predecessors, (69), 20 states have call successors, (20), 13 states have call predecessors, (20), 12 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-04-06 23:17:03,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2022-04-06 23:17:03,605 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 53 [2022-04-06 23:17:03,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:03,606 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2022-04-06 23:17:03,606 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-04-06 23:17:03,606 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2022-04-06 23:17:03,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-04-06 23:17:03,607 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:03,607 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:03,637 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 23:17:03,835 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:03,835 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:03,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:03,835 INFO L85 PathProgramCache]: Analyzing trace with hash 1864650262, now seen corresponding path program 3 times [2022-04-06 23:17:03,835 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:03,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [172452860] [2022-04-06 23:17:03,840 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 23:17:03,840 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 23:17:03,840 INFO L85 PathProgramCache]: Analyzing trace with hash 1864650262, now seen corresponding path program 4 times [2022-04-06 23:17:03,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:03,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973041491] [2022-04-06 23:17:03,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:03,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:03,848 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:03,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [6466602] [2022-04-06 23:17:03,849 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 23:17:03,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:03,849 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:03,850 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 23:17:03,877 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 23:17:03,901 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 23:17:03,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:03,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 23:17:03,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:04,010 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-04-06 23:17:04,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 23:17:04,128 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 14 proven. 10 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-04-06 23:17:04,128 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:04,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973041491] [2022-04-06 23:17:04,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:04,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6466602] [2022-04-06 23:17:04,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6466602] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 23:17:04,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 23:17:04,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-04-06 23:17:04,129 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:04,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [172452860] [2022-04-06 23:17:04,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [172452860] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:04,130 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:04,130 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 23:17:04,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818029570] [2022-04-06 23:17:04,130 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:04,130 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 23:17:04,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:04,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 23:17:04,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-06 23:17:04,131 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-04-06 23:17:04,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:04,208 INFO L93 Difference]: Finished difference Result 126 states and 155 transitions. [2022-04-06 23:17:04,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 23:17:04,208 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 55 [2022-04-06 23:17:04,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:04,209 INFO L225 Difference]: With dead ends: 126 [2022-04-06 23:17:04,209 INFO L226 Difference]: Without dead ends: 93 [2022-04-06 23:17:04,210 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2022-04-06 23:17:04,210 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 3 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:04,211 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 134 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 23:17:04,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-04-06 23:17:04,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-04-06 23:17:04,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 63 states have internal predecessors, (71), 20 states have call successors, (20), 13 states have call predecessors, (20), 12 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-04-06 23:17:04,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 109 transitions. [2022-04-06 23:17:04,220 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 109 transitions. Word has length 55 [2022-04-06 23:17:04,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:04,220 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 109 transitions. [2022-04-06 23:17:04,220 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-04-06 23:17:04,220 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 109 transitions. [2022-04-06 23:17:04,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-04-06 23:17:04,221 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:04,221 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:04,246 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 23:17:04,446 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:04,446 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:04,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:04,447 INFO L85 PathProgramCache]: Analyzing trace with hash -43330764, now seen corresponding path program 1 times [2022-04-06 23:17:04,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:04,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [421834503] [2022-04-06 23:17:04,450 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 23:17:04,450 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 23:17:04,450 INFO L85 PathProgramCache]: Analyzing trace with hash -43330764, now seen corresponding path program 2 times [2022-04-06 23:17:04,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:04,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382992448] [2022-04-06 23:17:04,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:04,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:04,469 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:04,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1164548528] [2022-04-06 23:17:04,469 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 23:17:04,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:04,470 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:04,472 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 23:17:04,506 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 23:17:04,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 23:17:04,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:04,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-06 23:17:04,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:04,688 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-06 23:17:04,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 23:17:04,843 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 23:17:04,844 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:04,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382992448] [2022-04-06 23:17:04,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:04,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164548528] [2022-04-06 23:17:04,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164548528] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 23:17:04,845 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 23:17:04,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-04-06 23:17:04,845 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:04,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [421834503] [2022-04-06 23:17:04,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [421834503] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:04,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:04,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 23:17:04,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072140761] [2022-04-06 23:17:04,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:04,846 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 23:17:04,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:04,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 23:17:04,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2022-04-06 23:17:04,846 INFO L87 Difference]: Start difference. First operand 93 states and 109 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2022-04-06 23:17:04,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:04,928 INFO L93 Difference]: Finished difference Result 145 states and 168 transitions. [2022-04-06 23:17:04,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 23:17:04,928 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 62 [2022-04-06 23:17:04,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:04,931 INFO L225 Difference]: With dead ends: 145 [2022-04-06 23:17:04,931 INFO L226 Difference]: Without dead ends: 130 [2022-04-06 23:17:04,932 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2022-04-06 23:17:04,932 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 27 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:04,933 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 150 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 23:17:04,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-04-06 23:17:04,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 127. [2022-04-06 23:17:04,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 83 states have (on average 1.1686746987951808) internal successors, (97), 86 states have internal predecessors, (97), 27 states have call successors, (27), 18 states have call predecessors, (27), 16 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-04-06 23:17:04,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 148 transitions. [2022-04-06 23:17:04,953 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 148 transitions. Word has length 62 [2022-04-06 23:17:04,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:04,954 INFO L478 AbstractCegarLoop]: Abstraction has 127 states and 148 transitions. [2022-04-06 23:17:04,954 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2022-04-06 23:17:04,954 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 148 transitions. [2022-04-06 23:17:04,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-04-06 23:17:04,955 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:04,955 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:04,982 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 23:17:05,175 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,SelfDestructingSolverStorable11 [2022-04-06 23:17:05,176 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:05,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:05,176 INFO L85 PathProgramCache]: Analyzing trace with hash -41602886, now seen corresponding path program 1 times [2022-04-06 23:17:05,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:05,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1304768286] [2022-04-06 23:17:05,180 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 23:17:05,180 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 23:17:05,180 INFO L85 PathProgramCache]: Analyzing trace with hash -41602886, now seen corresponding path program 2 times [2022-04-06 23:17:05,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:05,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637694055] [2022-04-06 23:17:05,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:05,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:05,189 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:05,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [409239016] [2022-04-06 23:17:05,190 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 23:17:05,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:05,190 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:05,191 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 23:17:05,196 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 23:17:05,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 23:17:05,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:05,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 25 conjunts are in the unsatisfiable core [2022-04-06 23:17:05,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:05,599 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 23:17:05,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 23:17:06,625 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 23:17:06,626 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 23:17:06,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637694055] [2022-04-06 23:17:06,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 23:17:06,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409239016] [2022-04-06 23:17:06,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409239016] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 23:17:06,626 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 23:17:06,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2022-04-06 23:17:06,627 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 23:17:06,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1304768286] [2022-04-06 23:17:06,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1304768286] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 23:17:06,627 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 23:17:06,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 23:17:06,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291803555] [2022-04-06 23:17:06,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 23:17:06,628 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 23:17:06,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:06,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 23:17:06,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-04-06 23:17:06,629 INFO L87 Difference]: Start difference. First operand 127 states and 148 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-04-06 23:17:06,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 23:17:06,788 INFO L93 Difference]: Finished difference Result 181 states and 219 transitions. [2022-04-06 23:17:06,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 23:17:06,789 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2022-04-06 23:17:06,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 23:17:06,790 INFO L225 Difference]: With dead ends: 181 [2022-04-06 23:17:06,790 INFO L226 Difference]: Without dead ends: 137 [2022-04-06 23:17:06,791 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2022-04-06 23:17:06,791 INFO L913 BasicCegarLoop]: 50 mSDtfsCounter, 13 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 23:17:06,791 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 187 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 23:17:06,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-04-06 23:17:06,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 135. [2022-04-06 23:17:06,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 89 states have (on average 1.1685393258426966) internal successors, (104), 92 states have internal predecessors, (104), 27 states have call successors, (27), 19 states have call predecessors, (27), 18 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-04-06 23:17:06,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 156 transitions. [2022-04-06 23:17:06,804 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 156 transitions. Word has length 62 [2022-04-06 23:17:06,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 23:17:06,804 INFO L478 AbstractCegarLoop]: Abstraction has 135 states and 156 transitions. [2022-04-06 23:17:06,804 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-04-06 23:17:06,804 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 156 transitions. [2022-04-06 23:17:06,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-04-06 23:17:06,805 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 23:17:06,805 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 23:17:06,831 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 23:17:07,025 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 23:17:07,025 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 23:17:07,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 23:17:07,026 INFO L85 PathProgramCache]: Analyzing trace with hash -378736343, now seen corresponding path program 3 times [2022-04-06 23:17:07,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 23:17:07,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2138050035] [2022-04-06 23:17:07,030 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 23:17:07,030 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 23:17:07,030 INFO L85 PathProgramCache]: Analyzing trace with hash -378736343, now seen corresponding path program 4 times [2022-04-06 23:17:07,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 23:17:07,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450069794] [2022-04-06 23:17:07,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 23:17:07,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 23:17:07,037 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 23:17:07,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1385571506] [2022-04-06 23:17:07,038 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 23:17:07,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 23:17:07,038 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 23:17:07,060 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 23:17:07,075 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 23:17:07,156 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 23:17:07,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 23:17:07,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 37 conjunts are in the unsatisfiable core [2022-04-06 23:17:07,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 23:17:14,310 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 59 proven. 29 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-04-06 23:17:14,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 23:17:15,010 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 23:21:50,420 WARN L232 SmtUtils]: Spent 5.93s on a formula simplification. DAG size of input: 5 DAG size of output: 1 (called from [L1067] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-04-06 23:27:58,152 WARN L232 SmtUtils]: Spent 5.03s on a formula simplification. DAG size of input: 10 DAG size of output: 1 (called from [L1067] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-04-06 23:29:12,267 WARN L232 SmtUtils]: Spent 5.74s on a formula simplification. DAG size of input: 10 DAG size of output: 1 (called from [L1067] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)