/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops/eureka_01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 17:45:52,074 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 17:45:52,075 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 17:45:52,098 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 17:45:52,104 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-20 17:45:52,105 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-20 17:45:52,106 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-20 17:45:52,106 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-20 17:45:52,107 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-20 17:45:52,107 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-20 17:45:52,109 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-20 17:45:52,110 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-20 17:45:52,117 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-20 17:45:52,118 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-20 17:45:52,119 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-20 17:45:52,120 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-20 17:45:52,120 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-20 17:45:52,123 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-03-20 17:45:52,128 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 17:45:52,129 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 17:45:52,137 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 17:45:52,138 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 17:45:52,144 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 17:45:52,144 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 17:45:52,145 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 17:45:52,145 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 17:45:52,145 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 17:45:52,145 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 17:45:52,145 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 17:45:52,145 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 17:45:52,146 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 17:45:52,146 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 17:45:52,146 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 17:45:52,146 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 17:45:52,146 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 17:45:52,146 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 17:45:52,146 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 17:45:52,146 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 17:45:52,146 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 17:45:52,146 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 17:45:52,147 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 17:45:52,147 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 17:45:52,147 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 17:45:52,152 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 17:45:52,153 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 17:45:52,304 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 17:45:52,321 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 17:45:52,323 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 17:45:52,323 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 17:45:52,327 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 17:45:52,328 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/eureka_01-2.c [2022-03-20 17:45:52,377 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d2b166481/eee7b36a929d48ec894c560a023e3e4b/FLAGfee275e02 [2022-03-20 17:45:52,689 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 17:45:52,689 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_01-2.c [2022-03-20 17:45:52,693 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d2b166481/eee7b36a929d48ec894c560a023e3e4b/FLAGfee275e02 [2022-03-20 17:45:52,703 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d2b166481/eee7b36a929d48ec894c560a023e3e4b [2022-03-20 17:45:52,705 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 17:45:52,706 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 17:45:52,707 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 17:45:52,708 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 17:45:52,709 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 17:45:52,710 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,710 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46b440c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52, skipping insertion in model container [2022-03-20 17:45:52,711 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,715 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 17:45:52,726 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 17:45:52,831 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_01-2.c[323,336] [2022-03-20 17:45:52,859 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 17:45:52,863 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 17:45:52,870 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_01-2.c[323,336] [2022-03-20 17:45:52,882 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 17:45:52,889 INFO L208 MainTranslator]: Completed translation [2022-03-20 17:45:52,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52 WrapperNode [2022-03-20 17:45:52,890 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 17:45:52,890 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 17:45:52,890 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 17:45:52,890 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 17:45:52,897 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,897 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,902 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,902 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,910 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,913 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,914 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,916 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 17:45:52,916 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 17:45:52,916 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 17:45:52,916 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 17:45:52,917 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (1/1) ... [2022-03-20 17:45:52,922 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 17:45:52,930 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:52,938 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 17:45:52,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 17:45:52,961 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 17:45:52,961 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 17:45:52,961 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 17:45:52,961 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 17:45:52,962 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 17:45:52,962 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 17:45:52,962 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 17:45:52,962 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 17:45:52,962 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 17:45:52,962 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 17:45:52,962 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 17:45:52,963 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-20 17:45:52,963 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 17:45:52,963 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 17:45:52,963 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 17:45:52,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 17:45:52,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 17:45:52,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 17:45:53,014 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 17:45:53,015 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 17:45:53,207 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 17:45:53,211 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 17:45:53,211 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2022-03-20 17:45:53,212 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 05:45:53 BoogieIcfgContainer [2022-03-20 17:45:53,213 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 17:45:53,214 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 17:45:53,214 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 17:45:53,217 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 17:45:53,218 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 05:45:52" (1/3) ... [2022-03-20 17:45:53,218 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@287d8fa3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 05:45:53, skipping insertion in model container [2022-03-20 17:45:53,218 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:45:52" (2/3) ... [2022-03-20 17:45:53,218 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@287d8fa3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 05:45:53, skipping insertion in model container [2022-03-20 17:45:53,218 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 05:45:53" (3/3) ... [2022-03-20 17:45:53,219 INFO L111 eAbstractionObserver]: Analyzing ICFG eureka_01-2.c [2022-03-20 17:45:53,222 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 17:45:53,222 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 17:45:53,247 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 17:45:53,251 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 17:45:53,251 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 17:45:53,259 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 17:45:53,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 17:45:53,264 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:53,264 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:53,264 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:53,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:53,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1209894008, now seen corresponding path program 1 times [2022-03-20 17:45:53,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:53,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [719073743] [2022-03-20 17:45:53,279 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 17:45:53,279 INFO L85 PathProgramCache]: Analyzing trace with hash -1209894008, now seen corresponding path program 2 times [2022-03-20 17:45:53,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:53,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333699305] [2022-03-20 17:45:53,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:53,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:53,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:53,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:53,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:53,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:45:53,427 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:53,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333699305] [2022-03-20 17:45:53,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333699305] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:53,428 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:53,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 17:45:53,430 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:53,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [719073743] [2022-03-20 17:45:53,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [719073743] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:53,430 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:53,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 17:45:53,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394946663] [2022-03-20 17:45:53,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:53,433 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 17:45:53,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:53,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 17:45:53,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 17:45:53,452 INFO L87 Difference]: Start difference. First operand has 35 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:53,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:53,479 INFO L93 Difference]: Finished difference Result 61 states and 85 transitions. [2022-03-20 17:45:53,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 17:45:53,481 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 17:45:53,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:53,485 INFO L225 Difference]: With dead ends: 61 [2022-03-20 17:45:53,485 INFO L226 Difference]: Without dead ends: 30 [2022-03-20 17:45:53,487 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 17:45:53,490 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 33 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:53,490 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 43 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:45:53,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-20 17:45:53,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-20 17:45:53,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:53,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-03-20 17:45:53,514 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 17 [2022-03-20 17:45:53,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:53,514 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-03-20 17:45:53,514 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:53,514 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-03-20 17:45:53,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 17:45:53,515 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:53,515 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:53,515 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 17:45:53,515 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:53,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:53,516 INFO L85 PathProgramCache]: Analyzing trace with hash -286620772, now seen corresponding path program 1 times [2022-03-20 17:45:53,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:53,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [905945278] [2022-03-20 17:45:53,517 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 17:45:53,517 INFO L85 PathProgramCache]: Analyzing trace with hash -286620772, now seen corresponding path program 2 times [2022-03-20 17:45:53,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:53,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871307649] [2022-03-20 17:45:53,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:53,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:53,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:53,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:53,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:53,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:45:53,642 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:53,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871307649] [2022-03-20 17:45:53,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871307649] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:53,643 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:53,643 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 17:45:53,643 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:53,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [905945278] [2022-03-20 17:45:53,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [905945278] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:53,643 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:53,644 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 17:45:53,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327384312] [2022-03-20 17:45:53,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:53,644 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 17:45:53,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:53,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 17:45:53,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 17:45:53,645 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:53,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:53,726 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2022-03-20 17:45:53,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 17:45:53,726 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 17:45:53,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:53,728 INFO L225 Difference]: With dead ends: 54 [2022-03-20 17:45:53,728 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 17:45:53,728 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 17:45:53,731 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 35 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:53,732 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 38 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:45:53,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 17:45:53,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2022-03-20 17:45:53,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:53,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2022-03-20 17:45:53,743 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 17 [2022-03-20 17:45:53,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:53,744 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2022-03-20 17:45:53,744 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:53,744 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2022-03-20 17:45:53,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 17:45:53,744 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:53,745 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:53,745 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 17:45:53,745 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:53,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:53,745 INFO L85 PathProgramCache]: Analyzing trace with hash -344225220, now seen corresponding path program 1 times [2022-03-20 17:45:53,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:53,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1288227998] [2022-03-20 17:45:53,753 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:53,754 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:53,754 INFO L85 PathProgramCache]: Analyzing trace with hash -344225220, now seen corresponding path program 2 times [2022-03-20 17:45:53,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:53,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914873425] [2022-03-20 17:45:53,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:53,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:53,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:53,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:53,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:53,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 17:45:53,834 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:53,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914873425] [2022-03-20 17:45:53,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914873425] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:53,834 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:53,834 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 17:45:53,834 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:53,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1288227998] [2022-03-20 17:45:53,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1288227998] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:53,835 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:53,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 17:45:53,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581434485] [2022-03-20 17:45:53,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:53,835 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 17:45:53,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:53,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 17:45:53,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-20 17:45:53,836 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:53,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:53,952 INFO L93 Difference]: Finished difference Result 61 states and 74 transitions. [2022-03-20 17:45:53,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 17:45:53,952 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-20 17:45:53,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:53,956 INFO L225 Difference]: With dead ends: 61 [2022-03-20 17:45:53,956 INFO L226 Difference]: Without dead ends: 46 [2022-03-20 17:45:53,957 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-03-20 17:45:53,960 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 75 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:53,964 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 34 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:45:53,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-20 17:45:53,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 32. [2022-03-20 17:45:53,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:53,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2022-03-20 17:45:53,978 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 20 [2022-03-20 17:45:53,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:53,978 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2022-03-20 17:45:53,978 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:53,978 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2022-03-20 17:45:53,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 17:45:53,979 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:53,979 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:53,979 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 17:45:53,979 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:53,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:53,980 INFO L85 PathProgramCache]: Analyzing trace with hash -522475142, now seen corresponding path program 1 times [2022-03-20 17:45:53,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:53,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [113044130] [2022-03-20 17:45:53,981 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:53,981 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:53,981 INFO L85 PathProgramCache]: Analyzing trace with hash -522475142, now seen corresponding path program 2 times [2022-03-20 17:45:53,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:53,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862525945] [2022-03-20 17:45:53,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:53,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:54,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:54,062 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:54,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:54,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 17:45:54,066 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:54,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862525945] [2022-03-20 17:45:54,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862525945] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:54,067 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:54,067 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 17:45:54,067 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:54,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [113044130] [2022-03-20 17:45:54,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [113044130] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:54,067 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:54,067 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 17:45:54,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569230422] [2022-03-20 17:45:54,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:54,068 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 17:45:54,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:54,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 17:45:54,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-20 17:45:54,069 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:54,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:54,137 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2022-03-20 17:45:54,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 17:45:54,138 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-20 17:45:54,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:54,138 INFO L225 Difference]: With dead ends: 55 [2022-03-20 17:45:54,139 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 17:45:54,141 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-03-20 17:45:54,144 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 56 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:54,145 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 35 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:45:54,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 17:45:54,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2022-03-20 17:45:54,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:54,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2022-03-20 17:45:54,161 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 23 [2022-03-20 17:45:54,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:54,162 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2022-03-20 17:45:54,162 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:54,162 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2022-03-20 17:45:54,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 17:45:54,164 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:54,164 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:54,164 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 17:45:54,164 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:54,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:54,165 INFO L85 PathProgramCache]: Analyzing trace with hash 1086024003, now seen corresponding path program 1 times [2022-03-20 17:45:54,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:54,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [573812013] [2022-03-20 17:45:54,169 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:54,169 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:54,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1086024003, now seen corresponding path program 2 times [2022-03-20 17:45:54,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:54,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607306227] [2022-03-20 17:45:54,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:54,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:54,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:54,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:54,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:54,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:54,262 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:54,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607306227] [2022-03-20 17:45:54,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607306227] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:54,262 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:54,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 17:45:54,263 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:54,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [573812013] [2022-03-20 17:45:54,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [573812013] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:54,263 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:54,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 17:45:54,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401663427] [2022-03-20 17:45:54,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:54,264 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 17:45:54,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:54,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 17:45:54,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-20 17:45:54,265 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:54,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:54,344 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2022-03-20 17:45:54,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 17:45:54,344 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-20 17:45:54,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:54,345 INFO L225 Difference]: With dead ends: 58 [2022-03-20 17:45:54,345 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 17:45:54,345 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-03-20 17:45:54,345 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 72 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:54,346 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 29 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:45:54,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 17:45:54,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 34. [2022-03-20 17:45:54,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:54,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-03-20 17:45:54,353 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 26 [2022-03-20 17:45:54,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:54,353 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-03-20 17:45:54,353 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:54,353 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-03-20 17:45:54,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 17:45:54,354 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:54,354 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:54,354 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 17:45:54,354 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:54,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:54,354 INFO L85 PathProgramCache]: Analyzing trace with hash -669976079, now seen corresponding path program 1 times [2022-03-20 17:45:54,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:54,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [934517689] [2022-03-20 17:45:54,358 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:54,358 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:54,358 INFO L85 PathProgramCache]: Analyzing trace with hash -669976079, now seen corresponding path program 2 times [2022-03-20 17:45:54,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:54,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798376979] [2022-03-20 17:45:54,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:54,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:54,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:54,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:54,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:54,437 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:54,437 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:54,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798376979] [2022-03-20 17:45:54,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798376979] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:54,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123977850] [2022-03-20 17:45:54,439 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:45:54,439 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:54,439 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:54,444 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:54,447 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 17:45:54,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:45:54,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:54,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:45:54,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:54,656 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:54,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:45:54,725 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:54,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123977850] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:45:54,726 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:45:54,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2022-03-20 17:45:54,726 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:54,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [934517689] [2022-03-20 17:45:54,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [934517689] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:54,726 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:54,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 17:45:54,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898011990] [2022-03-20 17:45:54,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:54,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 17:45:54,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:54,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 17:45:54,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2022-03-20 17:45:54,729 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:54,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:54,793 INFO L93 Difference]: Finished difference Result 63 states and 76 transitions. [2022-03-20 17:45:54,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 17:45:54,794 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-20 17:45:54,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:54,796 INFO L225 Difference]: With dead ends: 63 [2022-03-20 17:45:54,796 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 17:45:54,796 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2022-03-20 17:45:54,797 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 42 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:54,797 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 38 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:45:54,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 17:45:54,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2022-03-20 17:45:54,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:54,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-03-20 17:45:54,807 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 29 [2022-03-20 17:45:54,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:54,807 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-03-20 17:45:54,807 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:54,807 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-03-20 17:45:54,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 17:45:54,808 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:54,808 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:54,827 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:55,011 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-03-20 17:45:55,012 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:55,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:55,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1490218863, now seen corresponding path program 3 times [2022-03-20 17:45:55,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:55,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1065650503] [2022-03-20 17:45:55,013 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:55,014 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:55,014 INFO L85 PathProgramCache]: Analyzing trace with hash -1490218863, now seen corresponding path program 4 times [2022-03-20 17:45:55,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:55,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49803302] [2022-03-20 17:45:55,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:55,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:55,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:55,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:55,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:55,076 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:55,076 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:55,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49803302] [2022-03-20 17:45:55,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49803302] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:55,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800007338] [2022-03-20 17:45:55,077 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:45:55,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:55,077 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:55,078 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:55,079 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 17:45:55,122 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:45:55,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:55,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2022-03-20 17:45:55,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:55,172 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:55,172 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 17:45:55,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800007338] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:55,173 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 17:45:55,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2022-03-20 17:45:55,173 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:55,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1065650503] [2022-03-20 17:45:55,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1065650503] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:55,173 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:55,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 17:45:55,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790105455] [2022-03-20 17:45:55,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:55,173 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 17:45:55,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:55,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 17:45:55,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-20 17:45:55,174 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:55,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:55,196 INFO L93 Difference]: Finished difference Result 65 states and 78 transitions. [2022-03-20 17:45:55,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 17:45:55,197 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-20 17:45:55,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:55,197 INFO L225 Difference]: With dead ends: 65 [2022-03-20 17:45:55,197 INFO L226 Difference]: Without dead ends: 38 [2022-03-20 17:45:55,197 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-20 17:45:55,198 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 4 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:55,198 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 50 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:45:55,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-20 17:45:55,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2022-03-20 17:45:55,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:55,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2022-03-20 17:45:55,203 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 32 [2022-03-20 17:45:55,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:55,203 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2022-03-20 17:45:55,203 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:55,203 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2022-03-20 17:45:55,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 17:45:55,203 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:55,203 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:55,222 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:55,419 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,SelfDestructingSolverStorable6 [2022-03-20 17:45:55,420 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:55,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:55,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1271364145, now seen corresponding path program 1 times [2022-03-20 17:45:55,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:55,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [751851945] [2022-03-20 17:45:55,421 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:55,421 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:55,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1271364145, now seen corresponding path program 2 times [2022-03-20 17:45:55,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:55,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675663571] [2022-03-20 17:45:55,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:55,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:55,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:55,470 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:55,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:55,474 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:55,474 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:55,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675663571] [2022-03-20 17:45:55,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675663571] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:55,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973529311] [2022-03-20 17:45:55,474 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:45:55,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:55,474 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:55,476 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:55,477 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 17:45:55,549 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:45:55,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:55,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 17:45:55,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:55,624 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:55,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:45:55,690 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:55,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973529311] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:45:55,690 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:45:55,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 12 [2022-03-20 17:45:55,691 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:55,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [751851945] [2022-03-20 17:45:55,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [751851945] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:55,691 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:55,691 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 17:45:55,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506778689] [2022-03-20 17:45:55,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:55,692 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 17:45:55,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:55,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 17:45:55,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=78, Unknown=0, NotChecked=0, Total=132 [2022-03-20 17:45:55,692 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:55,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:55,763 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2022-03-20 17:45:55,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 17:45:55,764 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-20 17:45:55,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:55,765 INFO L225 Difference]: With dead ends: 66 [2022-03-20 17:45:55,765 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 17:45:55,765 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=87, Invalid=123, Unknown=0, NotChecked=0, Total=210 [2022-03-20 17:45:55,774 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 43 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:55,775 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 43 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:45:55,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 17:45:55,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2022-03-20 17:45:55,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:55,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2022-03-20 17:45:55,787 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 32 [2022-03-20 17:45:55,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:55,787 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2022-03-20 17:45:55,787 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:55,787 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2022-03-20 17:45:55,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 17:45:55,788 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:55,788 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:55,806 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:56,004 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:56,005 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:56,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:56,005 INFO L85 PathProgramCache]: Analyzing trace with hash 1380320561, now seen corresponding path program 3 times [2022-03-20 17:45:56,005 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:56,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [428460831] [2022-03-20 17:45:56,006 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:56,007 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:56,007 INFO L85 PathProgramCache]: Analyzing trace with hash 1380320561, now seen corresponding path program 4 times [2022-03-20 17:45:56,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:56,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945339448] [2022-03-20 17:45:56,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:56,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:56,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:56,070 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:56,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:56,073 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:56,073 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:56,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945339448] [2022-03-20 17:45:56,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945339448] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:56,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116217309] [2022-03-20 17:45:56,074 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:45:56,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:56,074 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:56,075 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:56,095 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 17:45:56,157 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:45:56,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:56,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:45:56,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:56,233 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-03-20 17:45:56,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:45:56,295 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-03-20 17:45:56,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116217309] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:45:56,296 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:45:56,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2022-03-20 17:45:56,296 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:56,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [428460831] [2022-03-20 17:45:56,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [428460831] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:56,296 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:56,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 17:45:56,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521052278] [2022-03-20 17:45:56,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:56,297 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 17:45:56,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:56,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 17:45:56,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2022-03-20 17:45:56,297 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:56,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:56,389 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2022-03-20 17:45:56,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 17:45:56,389 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-20 17:45:56,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:56,390 INFO L225 Difference]: With dead ends: 69 [2022-03-20 17:45:56,390 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 17:45:56,390 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=106, Invalid=166, Unknown=0, NotChecked=0, Total=272 [2022-03-20 17:45:56,391 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 47 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:56,392 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 48 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:45:56,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 17:45:56,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2022-03-20 17:45:56,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:56,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2022-03-20 17:45:56,400 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 35 [2022-03-20 17:45:56,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:56,400 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2022-03-20 17:45:56,400 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:56,400 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2022-03-20 17:45:56,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 17:45:56,402 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:56,402 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:56,421 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:56,611 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:56,611 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:56,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:56,612 INFO L85 PathProgramCache]: Analyzing trace with hash 385921679, now seen corresponding path program 5 times [2022-03-20 17:45:56,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:56,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [852082689] [2022-03-20 17:45:56,613 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:56,613 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:56,613 INFO L85 PathProgramCache]: Analyzing trace with hash 385921679, now seen corresponding path program 6 times [2022-03-20 17:45:56,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:56,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532490893] [2022-03-20 17:45:56,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:56,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:56,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:56,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:56,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:56,682 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 17:45:56,683 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:56,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532490893] [2022-03-20 17:45:56,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532490893] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:56,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073498143] [2022-03-20 17:45:56,683 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:45:56,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:56,683 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:56,684 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:56,685 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 17:45:56,755 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:45:56,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:56,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:45:56,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:56,832 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 17:45:56,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:45:56,895 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 17:45:56,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073498143] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:45:56,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:45:56,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 14 [2022-03-20 17:45:56,895 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:56,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [852082689] [2022-03-20 17:45:56,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [852082689] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:56,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:56,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 17:45:56,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835086069] [2022-03-20 17:45:56,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:56,896 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 17:45:56,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:56,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 17:45:56,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=114, Unknown=0, NotChecked=0, Total=182 [2022-03-20 17:45:56,896 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:56,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:56,992 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2022-03-20 17:45:56,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 17:45:56,992 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-03-20 17:45:56,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:56,993 INFO L225 Difference]: With dead ends: 72 [2022-03-20 17:45:56,993 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 17:45:56,993 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=130, Invalid=212, Unknown=0, NotChecked=0, Total=342 [2022-03-20 17:45:56,993 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 52 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:56,994 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 43 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:45:56,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 17:45:57,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2022-03-20 17:45:57,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 40 states have (on average 1.175) internal successors, (47), 40 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:57,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2022-03-20 17:45:57,003 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 38 [2022-03-20 17:45:57,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:57,003 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2022-03-20 17:45:57,003 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:57,003 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2022-03-20 17:45:57,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 17:45:57,004 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:57,004 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:57,025 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:57,213 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 17:45:57,213 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:57,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:57,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1361731471, now seen corresponding path program 7 times [2022-03-20 17:45:57,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:57,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1271844431] [2022-03-20 17:45:57,215 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:57,215 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:57,215 INFO L85 PathProgramCache]: Analyzing trace with hash -1361731471, now seen corresponding path program 8 times [2022-03-20 17:45:57,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:57,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015192425] [2022-03-20 17:45:57,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:57,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:57,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:57,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:57,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:57,254 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:45:57,254 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:57,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015192425] [2022-03-20 17:45:57,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015192425] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:57,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995103815] [2022-03-20 17:45:57,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:45:57,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:57,255 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:57,255 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:57,256 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 17:45:57,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:45:57,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:57,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:45:57,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:57,408 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-20 17:45:57,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:45:57,478 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-20 17:45:57,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995103815] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:45:57,479 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:45:57,479 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 11 [2022-03-20 17:45:57,479 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:57,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1271844431] [2022-03-20 17:45:57,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1271844431] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:57,479 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:57,479 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 17:45:57,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773967392] [2022-03-20 17:45:57,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:57,480 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 17:45:57,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:57,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 17:45:57,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2022-03-20 17:45:57,480 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:57,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:57,552 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2022-03-20 17:45:57,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 17:45:57,553 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-20 17:45:57,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:57,553 INFO L225 Difference]: With dead ends: 73 [2022-03-20 17:45:57,553 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 17:45:57,554 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2022-03-20 17:45:57,554 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 63 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:57,554 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 45 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:45:57,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 17:45:57,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2022-03-20 17:45:57,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:57,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2022-03-20 17:45:57,559 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 41 [2022-03-20 17:45:57,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:57,570 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2022-03-20 17:45:57,570 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:57,570 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2022-03-20 17:45:57,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 17:45:57,573 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:57,573 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:57,593 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:57,789 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:57,790 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:57,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:57,790 INFO L85 PathProgramCache]: Analyzing trace with hash -1307195270, now seen corresponding path program 9 times [2022-03-20 17:45:57,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:57,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [584753051] [2022-03-20 17:45:57,791 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:57,791 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:57,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1307195270, now seen corresponding path program 10 times [2022-03-20 17:45:57,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:57,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552457069] [2022-03-20 17:45:57,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:57,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:57,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:57,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:57,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:57,846 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:45:57,846 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:57,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552457069] [2022-03-20 17:45:57,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552457069] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:57,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394926027] [2022-03-20 17:45:57,847 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:45:57,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:57,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:57,848 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:57,849 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 17:45:57,904 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:45:57,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:57,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 17:45:57,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:57,995 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:45:57,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:45:58,059 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:45:58,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394926027] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:45:58,059 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:45:58,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2022-03-20 17:45:58,059 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:58,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [584753051] [2022-03-20 17:45:58,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [584753051] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:58,060 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:58,060 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 17:45:58,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293171279] [2022-03-20 17:45:58,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:58,060 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 17:45:58,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:58,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 17:45:58,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2022-03-20 17:45:58,060 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:58,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:58,151 INFO L93 Difference]: Finished difference Result 79 states and 94 transitions. [2022-03-20 17:45:58,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 17:45:58,151 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-20 17:45:58,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:58,152 INFO L225 Difference]: With dead ends: 79 [2022-03-20 17:45:58,152 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 17:45:58,152 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=73, Invalid=233, Unknown=0, NotChecked=0, Total=306 [2022-03-20 17:45:58,152 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 73 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:58,153 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 45 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:45:58,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 17:45:58,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2022-03-20 17:45:58,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 46 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:58,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2022-03-20 17:45:58,158 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 44 [2022-03-20 17:45:58,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:58,158 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2022-03-20 17:45:58,158 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:58,158 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2022-03-20 17:45:58,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 17:45:58,158 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:58,158 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:58,179 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:58,377 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:58,378 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:58,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:58,378 INFO L85 PathProgramCache]: Analyzing trace with hash -116869167, now seen corresponding path program 11 times [2022-03-20 17:45:58,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:58,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1006452656] [2022-03-20 17:45:58,379 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:58,379 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:58,380 INFO L85 PathProgramCache]: Analyzing trace with hash -116869167, now seen corresponding path program 12 times [2022-03-20 17:45:58,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:58,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904955302] [2022-03-20 17:45:58,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:58,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:58,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:58,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:58,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:58,445 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:45:58,445 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:58,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904955302] [2022-03-20 17:45:58,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904955302] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:58,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048809003] [2022-03-20 17:45:58,446 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:45:58,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:58,446 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:58,447 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:58,448 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 17:45:58,520 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:45:58,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:58,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:45:58,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:58,631 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2022-03-20 17:45:58,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:45:58,725 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2022-03-20 17:45:58,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048809003] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:45:58,726 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:45:58,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 14 [2022-03-20 17:45:58,726 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:58,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1006452656] [2022-03-20 17:45:58,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1006452656] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:58,726 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:58,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 17:45:58,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032337712] [2022-03-20 17:45:58,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:58,726 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 17:45:58,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:58,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 17:45:58,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2022-03-20 17:45:58,727 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:58,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:58,832 INFO L93 Difference]: Finished difference Result 85 states and 102 transitions. [2022-03-20 17:45:58,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 17:45:58,832 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-20 17:45:58,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:58,832 INFO L225 Difference]: With dead ends: 85 [2022-03-20 17:45:58,832 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 17:45:58,833 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2022-03-20 17:45:58,833 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 84 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:58,833 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 45 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:45:58,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 17:45:58,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2022-03-20 17:45:58,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 49 states have (on average 1.2040816326530612) internal successors, (59), 49 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:58,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2022-03-20 17:45:58,838 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 47 [2022-03-20 17:45:58,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:58,838 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2022-03-20 17:45:58,838 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:58,838 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2022-03-20 17:45:58,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 17:45:58,839 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:58,839 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:58,857 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:59,049 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,SelfDestructingSolverStorable12 [2022-03-20 17:45:59,049 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:59,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:59,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1638069530, now seen corresponding path program 13 times [2022-03-20 17:45:59,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:59,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1974559260] [2022-03-20 17:45:59,051 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:59,051 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:59,051 INFO L85 PathProgramCache]: Analyzing trace with hash 1638069530, now seen corresponding path program 14 times [2022-03-20 17:45:59,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:59,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261001317] [2022-03-20 17:45:59,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:59,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:59,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:59,110 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:59,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:59,113 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:45:59,113 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:59,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261001317] [2022-03-20 17:45:59,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261001317] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:59,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228380053] [2022-03-20 17:45:59,113 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:45:59,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:59,114 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:59,114 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:59,115 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 17:45:59,201 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:45:59,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:59,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 17:45:59,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:45:59,322 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:45:59,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:45:59,440 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:45:59,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228380053] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:45:59,440 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:45:59,440 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 20 [2022-03-20 17:45:59,440 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:45:59,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1974559260] [2022-03-20 17:45:59,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1974559260] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:45:59,440 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:45:59,440 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 17:45:59,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901554991] [2022-03-20 17:45:59,440 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:45:59,441 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 17:45:59,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:59,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 17:45:59,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=231, Unknown=0, NotChecked=0, Total=380 [2022-03-20 17:45:59,442 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:59,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:45:59,561 INFO L93 Difference]: Finished difference Result 91 states and 110 transitions. [2022-03-20 17:45:59,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 17:45:59,561 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 50 [2022-03-20 17:45:59,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:45:59,562 INFO L225 Difference]: With dead ends: 91 [2022-03-20 17:45:59,562 INFO L226 Difference]: Without dead ends: 60 [2022-03-20 17:45:59,562 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=239, Invalid=411, Unknown=0, NotChecked=0, Total=650 [2022-03-20 17:45:59,563 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 93 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:45:59,563 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 50 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:45:59,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-20 17:45:59,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2022-03-20 17:45:59,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 52 states have (on average 1.2115384615384615) internal successors, (63), 52 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:45:59,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2022-03-20 17:45:59,568 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 50 [2022-03-20 17:45:59,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:45:59,568 INFO L478 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2022-03-20 17:45:59,568 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:45:59,568 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2022-03-20 17:45:59,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-20 17:45:59,569 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:45:59,569 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:45:59,587 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 17:45:59,782 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,SelfDestructingSolverStorable13 [2022-03-20 17:45:59,782 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:45:59,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:45:59,783 INFO L85 PathProgramCache]: Analyzing trace with hash 379897649, now seen corresponding path program 15 times [2022-03-20 17:45:59,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:45:59,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [626878631] [2022-03-20 17:45:59,784 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:45:59,784 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:45:59,784 INFO L85 PathProgramCache]: Analyzing trace with hash 379897649, now seen corresponding path program 16 times [2022-03-20 17:45:59,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:45:59,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361804690] [2022-03-20 17:45:59,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:45:59,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:45:59,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:59,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:45:59,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:45:59,840 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:45:59,840 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:45:59,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361804690] [2022-03-20 17:45:59,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1361804690] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:45:59,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232597227] [2022-03-20 17:45:59,841 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:45:59,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:45:59,841 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:45:59,842 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:45:59,855 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 17:45:59,937 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:45:59,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:45:59,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 17:45:59,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:00,055 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 23 proven. 14 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:00,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:00,164 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 23 proven. 14 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:00,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232597227] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:00,164 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:00,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 24 [2022-03-20 17:46:00,165 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:00,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [626878631] [2022-03-20 17:46:00,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [626878631] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:00,165 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:00,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 17:46:00,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793289690] [2022-03-20 17:46:00,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:00,165 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 17:46:00,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:00,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 17:46:00,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-03-20 17:46:00,166 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:00,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:00,333 INFO L93 Difference]: Finished difference Result 97 states and 118 transitions. [2022-03-20 17:46:00,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 17:46:00,333 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2022-03-20 17:46:00,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:00,334 INFO L225 Difference]: With dead ends: 97 [2022-03-20 17:46:00,334 INFO L226 Difference]: Without dead ends: 63 [2022-03-20 17:46:00,334 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=196, Invalid=734, Unknown=0, NotChecked=0, Total=930 [2022-03-20 17:46:00,335 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 101 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:00,335 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 60 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:00,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-20 17:46:00,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2022-03-20 17:46:00,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 55 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:00,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 72 transitions. [2022-03-20 17:46:00,341 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 72 transitions. Word has length 53 [2022-03-20 17:46:00,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:00,341 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 72 transitions. [2022-03-20 17:46:00,341 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:00,341 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 72 transitions. [2022-03-20 17:46:00,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-03-20 17:46:00,341 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:00,341 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:00,363 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:00,555 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 17:46:00,555 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:00,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:00,556 INFO L85 PathProgramCache]: Analyzing trace with hash 360982970, now seen corresponding path program 17 times [2022-03-20 17:46:00,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:00,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [596119503] [2022-03-20 17:46:00,557 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:00,557 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:00,557 INFO L85 PathProgramCache]: Analyzing trace with hash 360982970, now seen corresponding path program 18 times [2022-03-20 17:46:00,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:00,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188533519] [2022-03-20 17:46:00,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:00,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:00,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:00,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:00,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:00,621 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 1 proven. 51 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:00,621 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:00,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188533519] [2022-03-20 17:46:00,621 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188533519] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:00,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356599733] [2022-03-20 17:46:00,621 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:00,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:00,621 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:00,622 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:00,623 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 17:46:00,711 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:46:00,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:00,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:46:00,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:00,814 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2022-03-20 17:46:00,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:00,903 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2022-03-20 17:46:00,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356599733] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:00,903 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:00,903 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5] total 16 [2022-03-20 17:46:00,903 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:00,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [596119503] [2022-03-20 17:46:00,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [596119503] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:00,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:00,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 17:46:00,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896387374] [2022-03-20 17:46:00,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:00,904 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 17:46:00,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:00,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 17:46:00,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2022-03-20 17:46:00,905 INFO L87 Difference]: Start difference. First operand 61 states and 72 transitions. Second operand has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:01,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:01,065 INFO L93 Difference]: Finished difference Result 103 states and 126 transitions. [2022-03-20 17:46:01,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 17:46:01,065 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 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 56 [2022-03-20 17:46:01,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:01,066 INFO L225 Difference]: With dead ends: 103 [2022-03-20 17:46:01,066 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 17:46:01,066 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=159, Invalid=393, Unknown=0, NotChecked=0, Total=552 [2022-03-20 17:46:01,067 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 117 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:01,067 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 45 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:01,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 17:46:01,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-03-20 17:46:01,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 58 states have (on average 1.2241379310344827) internal successors, (71), 58 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:01,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 76 transitions. [2022-03-20 17:46:01,075 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 76 transitions. Word has length 56 [2022-03-20 17:46:01,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:01,075 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 76 transitions. [2022-03-20 17:46:01,075 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:01,075 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 76 transitions. [2022-03-20 17:46:01,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 17:46:01,075 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:01,075 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 7, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:01,111 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-20 17:46:01,291 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 17:46:01,291 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:01,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:01,292 INFO L85 PathProgramCache]: Analyzing trace with hash -485503343, now seen corresponding path program 19 times [2022-03-20 17:46:01,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:01,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2125244406] [2022-03-20 17:46:01,293 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:01,293 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:01,293 INFO L85 PathProgramCache]: Analyzing trace with hash -485503343, now seen corresponding path program 20 times [2022-03-20 17:46:01,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:01,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092830854] [2022-03-20 17:46:01,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:01,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:01,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:01,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:01,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:01,404 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:01,404 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:01,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092830854] [2022-03-20 17:46:01,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092830854] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:01,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096128965] [2022-03-20 17:46:01,405 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:01,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:01,405 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:01,406 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:01,407 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 17:46:01,504 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:01,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:01,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 17:46:01,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:01,687 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:01,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:01,845 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:01,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096128965] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:01,845 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:01,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 29 [2022-03-20 17:46:01,845 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:01,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2125244406] [2022-03-20 17:46:01,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2125244406] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:01,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:01,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 17:46:01,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559298108] [2022-03-20 17:46:01,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:01,846 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 17:46:01,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:01,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 17:46:01,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=483, Unknown=0, NotChecked=0, Total=812 [2022-03-20 17:46:01,846 INFO L87 Difference]: Start difference. First operand 64 states and 76 transitions. Second operand has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:02,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:02,017 INFO L93 Difference]: Finished difference Result 109 states and 134 transitions. [2022-03-20 17:46:02,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 17:46:02,017 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 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 59 [2022-03-20 17:46:02,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:02,018 INFO L225 Difference]: With dead ends: 109 [2022-03-20 17:46:02,018 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 17:46:02,019 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=518, Invalid=888, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 17:46:02,019 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 125 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:02,020 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 45 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:02,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 17:46:02,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2022-03-20 17:46:02,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 61 states have (on average 1.2295081967213115) internal successors, (75), 61 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:02,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 80 transitions. [2022-03-20 17:46:02,027 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 80 transitions. Word has length 59 [2022-03-20 17:46:02,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:02,027 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 80 transitions. [2022-03-20 17:46:02,027 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:02,027 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 80 transitions. [2022-03-20 17:46:02,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-03-20 17:46:02,028 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:02,028 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 8, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:02,046 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:02,243 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 17:46:02,243 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:02,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:02,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1888708186, now seen corresponding path program 21 times [2022-03-20 17:46:02,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:02,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1421939685] [2022-03-20 17:46:02,245 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:02,245 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:02,245 INFO L85 PathProgramCache]: Analyzing trace with hash 1888708186, now seen corresponding path program 22 times [2022-03-20 17:46:02,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:02,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893539957] [2022-03-20 17:46:02,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:02,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:02,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:02,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:02,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:02,331 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 1 proven. 92 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:02,331 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:02,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893539957] [2022-03-20 17:46:02,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893539957] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:02,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864986985] [2022-03-20 17:46:02,332 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:02,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:02,332 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:02,333 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:02,334 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 17:46:02,415 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:02,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:02,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 17:46:02,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:02,578 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 71 proven. 23 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:02,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:02,732 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 71 proven. 23 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:02,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864986985] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:02,732 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:02,732 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 33 [2022-03-20 17:46:02,732 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:02,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1421939685] [2022-03-20 17:46:02,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1421939685] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:02,732 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:02,732 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 17:46:02,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461040066] [2022-03-20 17:46:02,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:02,733 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 17:46:02,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:02,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 17:46:02,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=843, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 17:46:02,733 INFO L87 Difference]: Start difference. First operand 67 states and 80 transitions. Second operand has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:02,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:02,979 INFO L93 Difference]: Finished difference Result 115 states and 142 transitions. [2022-03-20 17:46:02,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 17:46:02,979 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 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 62 [2022-03-20 17:46:02,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:02,979 INFO L225 Difference]: With dead ends: 115 [2022-03-20 17:46:02,979 INFO L226 Difference]: Without dead ends: 72 [2022-03-20 17:46:02,980 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=370, Invalid=1436, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 17:46:02,980 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 137 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:02,981 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 50 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:02,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-20 17:46:02,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2022-03-20 17:46:02,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 64 states have (on average 1.234375) internal successors, (79), 64 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:02,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-03-20 17:46:02,987 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 62 [2022-03-20 17:46:02,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:02,987 INFO L478 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-03-20 17:46:02,988 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:02,988 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-03-20 17:46:02,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-20 17:46:02,988 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:02,988 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 9, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:03,004 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:03,191 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 17:46:03,191 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:03,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:03,192 INFO L85 PathProgramCache]: Analyzing trace with hash -1792029199, now seen corresponding path program 23 times [2022-03-20 17:46:03,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:03,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1981616764] [2022-03-20 17:46:03,193 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:03,193 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:03,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1792029199, now seen corresponding path program 24 times [2022-03-20 17:46:03,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:03,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093798672] [2022-03-20 17:46:03,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:03,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:03,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:03,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:03,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:03,316 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 1 proven. 117 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:03,316 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:03,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093798672] [2022-03-20 17:46:03,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093798672] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:03,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899639456] [2022-03-20 17:46:03,317 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:03,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:03,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:03,318 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:03,319 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 17:46:03,414 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:46:03,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:03,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:46:03,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:03,549 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-03-20 17:46:03,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:03,653 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-03-20 17:46:03,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1899639456] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:03,653 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:03,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5, 5] total 20 [2022-03-20 17:46:03,653 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:03,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1981616764] [2022-03-20 17:46:03,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1981616764] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:03,654 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:03,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 17:46:03,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912486433] [2022-03-20 17:46:03,654 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:03,654 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 17:46:03,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:03,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 17:46:03,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2022-03-20 17:46:03,654 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 13 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:03,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:03,876 INFO L93 Difference]: Finished difference Result 121 states and 150 transitions. [2022-03-20 17:46:03,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 17:46:03,876 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 13 states have internal predecessors, (50), 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 65 [2022-03-20 17:46:03,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:03,876 INFO L225 Difference]: With dead ends: 121 [2022-03-20 17:46:03,876 INFO L226 Difference]: Without dead ends: 75 [2022-03-20 17:46:03,877 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2022-03-20 17:46:03,877 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 132 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:03,877 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 55 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:03,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-20 17:46:03,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2022-03-20 17:46:03,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 67 states have (on average 1.2388059701492538) internal successors, (83), 67 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:03,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2022-03-20 17:46:03,885 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 65 [2022-03-20 17:46:03,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:03,885 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2022-03-20 17:46:03,885 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 13 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:03,885 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2022-03-20 17:46:03,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 17:46:03,885 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:03,885 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 10, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:03,904 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-03-20 17:46:04,101 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:04,102 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:04,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:04,102 INFO L85 PathProgramCache]: Analyzing trace with hash 170568442, now seen corresponding path program 25 times [2022-03-20 17:46:04,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:04,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [969619003] [2022-03-20 17:46:04,103 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:04,103 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:04,103 INFO L85 PathProgramCache]: Analyzing trace with hash 170568442, now seen corresponding path program 26 times [2022-03-20 17:46:04,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:04,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823150093] [2022-03-20 17:46:04,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:04,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:04,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:04,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:04,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:04,213 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 1 proven. 145 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:04,213 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:04,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823150093] [2022-03-20 17:46:04,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823150093] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:04,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559750058] [2022-03-20 17:46:04,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:04,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:04,214 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:04,215 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:04,216 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 17:46:04,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:04,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:04,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 17:46:04,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:04,570 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 1 proven. 145 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:04,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:04,808 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 1 proven. 145 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:04,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559750058] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:04,808 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:04,808 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 36 [2022-03-20 17:46:04,808 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:04,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [969619003] [2022-03-20 17:46:04,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [969619003] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:04,809 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:04,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 17:46:04,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956972520] [2022-03-20 17:46:04,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:04,809 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 17:46:04,809 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:04,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 17:46:04,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=746, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 17:46:04,810 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:05,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:05,031 INFO L93 Difference]: Finished difference Result 127 states and 158 transitions. [2022-03-20 17:46:05,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 17:46:05,031 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 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 68 [2022-03-20 17:46:05,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:05,031 INFO L225 Difference]: With dead ends: 127 [2022-03-20 17:46:05,031 INFO L226 Difference]: Without dead ends: 78 [2022-03-20 17:46:05,032 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=816, Invalid=1440, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 17:46:05,032 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 161 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:05,032 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 45 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:05,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-20 17:46:05,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2022-03-20 17:46:05,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 70 states have (on average 1.2428571428571429) internal successors, (87), 70 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:05,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 92 transitions. [2022-03-20 17:46:05,040 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 92 transitions. Word has length 68 [2022-03-20 17:46:05,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:05,041 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 92 transitions. [2022-03-20 17:46:05,041 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:05,041 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 92 transitions. [2022-03-20 17:46:05,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-03-20 17:46:05,041 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:05,041 INFO L499 BasicCegarLoop]: trace histogram [11, 11, 11, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:05,058 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:05,246 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:05,246 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:05,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:05,247 INFO L85 PathProgramCache]: Analyzing trace with hash 527091025, now seen corresponding path program 27 times [2022-03-20 17:46:05,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:05,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [80843523] [2022-03-20 17:46:05,249 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:05,249 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:05,249 INFO L85 PathProgramCache]: Analyzing trace with hash 527091025, now seen corresponding path program 28 times [2022-03-20 17:46:05,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:05,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914552903] [2022-03-20 17:46:05,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:05,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:05,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:05,364 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:05,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:05,366 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 1 proven. 176 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:05,367 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:05,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914552903] [2022-03-20 17:46:05,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914552903] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:05,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730121646] [2022-03-20 17:46:05,367 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:05,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:05,367 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:05,368 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:05,369 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 17:46:05,476 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:05,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:05,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-20 17:46:05,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:05,683 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 146 proven. 32 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:05,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:05,854 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 146 proven. 32 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:05,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730121646] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:05,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:05,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 42 [2022-03-20 17:46:05,855 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:05,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [80843523] [2022-03-20 17:46:05,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [80843523] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:05,855 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:05,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 17:46:05,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578843644] [2022-03-20 17:46:05,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:05,855 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 17:46:05,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:05,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 17:46:05,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1359, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 17:46:05,856 INFO L87 Difference]: Start difference. First operand 76 states and 92 transitions. Second operand has 16 states, 16 states have (on average 3.5) internal successors, (56), 15 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:06,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:06,151 INFO L93 Difference]: Finished difference Result 133 states and 166 transitions. [2022-03-20 17:46:06,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 17:46:06,151 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.5) internal successors, (56), 15 states have internal predecessors, (56), 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 71 [2022-03-20 17:46:06,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:06,151 INFO L225 Difference]: With dead ends: 133 [2022-03-20 17:46:06,151 INFO L226 Difference]: Without dead ends: 81 [2022-03-20 17:46:06,152 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=607, Invalid=2363, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 17:46:06,153 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 169 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:06,153 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 50 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:06,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-20 17:46:06,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2022-03-20 17:46:06,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 73 states have (on average 1.2465753424657535) internal successors, (91), 73 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:06,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 96 transitions. [2022-03-20 17:46:06,164 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 96 transitions. Word has length 71 [2022-03-20 17:46:06,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:06,164 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 96 transitions. [2022-03-20 17:46:06,165 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.5) internal successors, (56), 15 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:06,165 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 96 transitions. [2022-03-20 17:46:06,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-03-20 17:46:06,165 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:06,165 INFO L499 BasicCegarLoop]: trace histogram [12, 12, 12, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:06,188 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:06,383 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:06,383 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:06,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:06,384 INFO L85 PathProgramCache]: Analyzing trace with hash 237238170, now seen corresponding path program 29 times [2022-03-20 17:46:06,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:06,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1329518570] [2022-03-20 17:46:06,385 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:06,385 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:06,385 INFO L85 PathProgramCache]: Analyzing trace with hash 237238170, now seen corresponding path program 30 times [2022-03-20 17:46:06,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:06,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309717717] [2022-03-20 17:46:06,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:06,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:06,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:06,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:06,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:06,571 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 1 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:06,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:06,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309717717] [2022-03-20 17:46:06,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309717717] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:06,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182836799] [2022-03-20 17:46:06,572 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:06,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:06,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:06,573 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:06,574 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 17:46:06,688 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:46:06,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:06,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:46:06,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:06,799 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2022-03-20 17:46:06,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:06,906 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2022-03-20 17:46:06,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182836799] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:06,907 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:06,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 5, 5] total 23 [2022-03-20 17:46:06,907 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:06,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1329518570] [2022-03-20 17:46:06,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1329518570] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:06,907 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:06,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 17:46:06,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446802133] [2022-03-20 17:46:06,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:06,907 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 17:46:06,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:06,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 17:46:06,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=333, Unknown=0, NotChecked=0, Total=506 [2022-03-20 17:46:06,908 INFO L87 Difference]: Start difference. First operand 79 states and 96 transitions. Second operand has 17 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:07,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:07,175 INFO L93 Difference]: Finished difference Result 139 states and 174 transitions. [2022-03-20 17:46:07,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 17:46:07,177 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 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 74 [2022-03-20 17:46:07,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:07,177 INFO L225 Difference]: With dead ends: 139 [2022-03-20 17:46:07,177 INFO L226 Difference]: Without dead ends: 84 [2022-03-20 17:46:07,178 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=439, Invalid=893, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 17:46:07,178 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 136 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:07,178 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 55 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:07,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-20 17:46:07,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2022-03-20 17:46:07,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 76 states have (on average 1.25) internal successors, (95), 76 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:07,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 100 transitions. [2022-03-20 17:46:07,188 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 100 transitions. Word has length 74 [2022-03-20 17:46:07,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:07,188 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 100 transitions. [2022-03-20 17:46:07,188 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:07,188 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 100 transitions. [2022-03-20 17:46:07,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-03-20 17:46:07,188 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:07,188 INFO L499 BasicCegarLoop]: trace histogram [13, 13, 13, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:07,207 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:07,400 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:07,400 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:07,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:07,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1884900175, now seen corresponding path program 31 times [2022-03-20 17:46:07,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:07,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1083073571] [2022-03-20 17:46:07,402 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:07,402 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:07,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1884900175, now seen corresponding path program 32 times [2022-03-20 17:46:07,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:07,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544258429] [2022-03-20 17:46:07,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:07,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:07,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:07,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:07,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:07,551 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 1 proven. 247 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:07,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:07,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544258429] [2022-03-20 17:46:07,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544258429] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:07,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683568260] [2022-03-20 17:46:07,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:07,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:07,552 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:07,553 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:07,554 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 17:46:07,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:07,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:07,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 17:46:07,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:07,984 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 1 proven. 247 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:07,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:08,195 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 1 proven. 247 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:08,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683568260] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:08,195 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:08,195 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 39 [2022-03-20 17:46:08,195 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:08,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1083073571] [2022-03-20 17:46:08,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1083073571] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:08,195 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:08,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 17:46:08,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979029203] [2022-03-20 17:46:08,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:08,196 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 17:46:08,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:08,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 17:46:08,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=589, Invalid=893, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 17:46:08,197 INFO L87 Difference]: Start difference. First operand 82 states and 100 transitions. Second operand has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:08,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:08,494 INFO L93 Difference]: Finished difference Result 145 states and 182 transitions. [2022-03-20 17:46:08,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 17:46:08,495 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 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 77 [2022-03-20 17:46:08,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:08,495 INFO L225 Difference]: With dead ends: 145 [2022-03-20 17:46:08,495 INFO L226 Difference]: Without dead ends: 87 [2022-03-20 17:46:08,496 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 837 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=972, Invalid=1890, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 17:46:08,496 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 193 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:08,496 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 45 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:08,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-20 17:46:08,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2022-03-20 17:46:08,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 79 states have (on average 1.2531645569620253) internal successors, (99), 79 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:08,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 104 transitions. [2022-03-20 17:46:08,507 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 104 transitions. Word has length 77 [2022-03-20 17:46:08,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:08,507 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 104 transitions. [2022-03-20 17:46:08,507 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:08,507 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 104 transitions. [2022-03-20 17:46:08,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-03-20 17:46:08,508 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:08,508 INFO L499 BasicCegarLoop]: trace histogram [14, 14, 14, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:08,526 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:08,719 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:08,719 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:08,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:08,719 INFO L85 PathProgramCache]: Analyzing trace with hash -589738950, now seen corresponding path program 33 times [2022-03-20 17:46:08,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:08,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1526514716] [2022-03-20 17:46:08,720 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:08,720 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:08,721 INFO L85 PathProgramCache]: Analyzing trace with hash -589738950, now seen corresponding path program 34 times [2022-03-20 17:46:08,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:08,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808753303] [2022-03-20 17:46:08,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:08,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:08,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:08,924 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:08,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:08,927 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 1 proven. 287 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:08,927 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:08,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808753303] [2022-03-20 17:46:08,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808753303] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:08,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817505967] [2022-03-20 17:46:08,927 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:08,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:08,928 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:08,928 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:08,929 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 17:46:09,041 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:09,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:09,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 17:46:09,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:09,257 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 248 proven. 41 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:09,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:09,485 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 248 proven. 41 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:09,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817505967] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:09,485 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:09,485 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 51 [2022-03-20 17:46:09,486 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:09,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1526514716] [2022-03-20 17:46:09,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1526514716] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:09,486 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:09,486 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 17:46:09,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712438498] [2022-03-20 17:46:09,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:09,486 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 17:46:09,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:09,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 17:46:09,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=1950, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 17:46:09,487 INFO L87 Difference]: Start difference. First operand 85 states and 104 transitions. Second operand has 19 states, 19 states have (on average 3.4210526315789473) internal successors, (65), 18 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:09,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:09,869 INFO L93 Difference]: Finished difference Result 151 states and 190 transitions. [2022-03-20 17:46:09,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 17:46:09,873 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.4210526315789473) internal successors, (65), 18 states have internal predecessors, (65), 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 80 [2022-03-20 17:46:09,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:09,873 INFO L225 Difference]: With dead ends: 151 [2022-03-20 17:46:09,873 INFO L226 Difference]: Without dead ends: 90 [2022-03-20 17:46:09,874 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1790 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=949, Invalid=3473, Unknown=0, NotChecked=0, Total=4422 [2022-03-20 17:46:09,875 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 200 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:09,875 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 40 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:09,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-03-20 17:46:09,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2022-03-20 17:46:09,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 82 states have (on average 1.2560975609756098) internal successors, (103), 82 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:09,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 108 transitions. [2022-03-20 17:46:09,886 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 108 transitions. Word has length 80 [2022-03-20 17:46:09,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:09,887 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 108 transitions. [2022-03-20 17:46:09,887 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.4210526315789473) internal successors, (65), 18 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:09,887 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 108 transitions. [2022-03-20 17:46:09,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-03-20 17:46:09,889 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:09,889 INFO L499 BasicCegarLoop]: trace histogram [15, 15, 15, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:09,909 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:10,099 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:10,099 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:10,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:10,100 INFO L85 PathProgramCache]: Analyzing trace with hash 1867095057, now seen corresponding path program 35 times [2022-03-20 17:46:10,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:10,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [245455450] [2022-03-20 17:46:10,101 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:10,101 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:10,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1867095057, now seen corresponding path program 36 times [2022-03-20 17:46:10,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:10,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127270284] [2022-03-20 17:46:10,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:10,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:10,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:10,268 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:10,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:10,271 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 1 proven. 330 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:10,271 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:10,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127270284] [2022-03-20 17:46:10,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127270284] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:10,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464253721] [2022-03-20 17:46:10,272 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:10,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:10,272 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:10,273 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:10,273 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 17:46:10,395 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:46:10,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:10,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:46:10,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:10,610 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2022-03-20 17:46:10,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:10,746 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2022-03-20 17:46:10,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464253721] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:10,746 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:10,746 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 5, 5] total 26 [2022-03-20 17:46:10,746 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:10,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [245455450] [2022-03-20 17:46:10,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [245455450] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:10,747 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:10,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 17:46:10,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832030503] [2022-03-20 17:46:10,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:10,747 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 17:46:10,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:10,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 17:46:10,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2022-03-20 17:46:10,748 INFO L87 Difference]: Start difference. First operand 88 states and 108 transitions. Second operand has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:11,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:11,085 INFO L93 Difference]: Finished difference Result 157 states and 198 transitions. [2022-03-20 17:46:11,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 17:46:11,086 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 states have internal predecessors, (68), 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 83 [2022-03-20 17:46:11,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:11,087 INFO L225 Difference]: With dead ends: 157 [2022-03-20 17:46:11,087 INFO L226 Difference]: Without dead ends: 93 [2022-03-20 17:46:11,088 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=521, Invalid=1285, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 17:46:11,088 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 226 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:11,092 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 45 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:11,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-03-20 17:46:11,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2022-03-20 17:46:11,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 85 states have (on average 1.2588235294117647) internal successors, (107), 85 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:11,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 112 transitions. [2022-03-20 17:46:11,106 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 112 transitions. Word has length 83 [2022-03-20 17:46:11,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:11,107 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 112 transitions. [2022-03-20 17:46:11,109 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:11,109 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 112 transitions. [2022-03-20 17:46:11,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-03-20 17:46:11,109 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:11,109 INFO L499 BasicCegarLoop]: trace histogram [16, 16, 16, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:11,127 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:11,319 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-03-20 17:46:11,319 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:11,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:11,320 INFO L85 PathProgramCache]: Analyzing trace with hash -1423660838, now seen corresponding path program 37 times [2022-03-20 17:46:11,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:11,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1258107316] [2022-03-20 17:46:11,321 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:11,321 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:11,321 INFO L85 PathProgramCache]: Analyzing trace with hash -1423660838, now seen corresponding path program 38 times [2022-03-20 17:46:11,321 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:11,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357010862] [2022-03-20 17:46:11,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:11,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:11,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:11,517 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:11,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:11,519 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 1 proven. 376 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:11,519 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:11,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357010862] [2022-03-20 17:46:11,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357010862] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:11,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098477432] [2022-03-20 17:46:11,520 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:11,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:11,520 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:11,521 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:11,521 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 17:46:11,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:11,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:11,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 601 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 17:46:11,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:12,023 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 1 proven. 376 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:12,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:12,217 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 1 proven. 376 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:12,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098477432] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:12,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:12,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 42 [2022-03-20 17:46:12,218 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:12,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1258107316] [2022-03-20 17:46:12,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1258107316] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:12,218 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:12,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 17:46:12,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579407519] [2022-03-20 17:46:12,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:12,220 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 17:46:12,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:12,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 17:46:12,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=1058, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 17:46:12,221 INFO L87 Difference]: Start difference. First operand 91 states and 112 transitions. Second operand has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:12,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:12,593 INFO L93 Difference]: Finished difference Result 163 states and 206 transitions. [2022-03-20 17:46:12,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 17:46:12,594 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 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 86 [2022-03-20 17:46:12,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:12,594 INFO L225 Difference]: With dead ends: 163 [2022-03-20 17:46:12,594 INFO L226 Difference]: Without dead ends: 96 [2022-03-20 17:46:12,595 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1047 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1128, Invalid=2412, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 17:46:12,596 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 225 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:12,596 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 50 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:12,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-03-20 17:46:12,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2022-03-20 17:46:12,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 88 states have (on average 1.2613636363636365) internal successors, (111), 88 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:12,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 116 transitions. [2022-03-20 17:46:12,608 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 116 transitions. Word has length 86 [2022-03-20 17:46:12,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:12,609 INFO L478 AbstractCegarLoop]: Abstraction has 94 states and 116 transitions. [2022-03-20 17:46:12,609 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:12,609 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 116 transitions. [2022-03-20 17:46:12,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-03-20 17:46:12,609 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:12,609 INFO L499 BasicCegarLoop]: trace histogram [17, 17, 17, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:12,627 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-20 17:46:12,823 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-20 17:46:12,823 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:12,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:12,824 INFO L85 PathProgramCache]: Analyzing trace with hash 590969713, now seen corresponding path program 39 times [2022-03-20 17:46:12,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:12,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1195354154] [2022-03-20 17:46:12,825 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:12,825 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:12,825 INFO L85 PathProgramCache]: Analyzing trace with hash 590969713, now seen corresponding path program 40 times [2022-03-20 17:46:12,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:12,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829528484] [2022-03-20 17:46:12,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:12,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:12,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:13,071 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:13,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:13,074 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 1 proven. 425 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:13,074 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:13,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829528484] [2022-03-20 17:46:13,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829528484] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:13,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718493794] [2022-03-20 17:46:13,074 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:13,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:13,074 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:13,075 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:13,076 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 17:46:13,205 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:13,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:13,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 17:46:13,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:13,455 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 377 proven. 50 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:13,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:13,707 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 377 proven. 50 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:13,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718493794] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:13,708 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:13,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 60 [2022-03-20 17:46:13,708 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:13,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1195354154] [2022-03-20 17:46:13,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1195354154] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:13,708 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:13,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 17:46:13,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163063459] [2022-03-20 17:46:13,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:13,708 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 17:46:13,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:13,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 17:46:13,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=849, Invalid=2691, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 17:46:13,710 INFO L87 Difference]: Start difference. First operand 94 states and 116 transitions. Second operand has 22 states, 22 states have (on average 3.3636363636363638) internal successors, (74), 21 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:14,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:14,168 INFO L93 Difference]: Finished difference Result 169 states and 214 transitions. [2022-03-20 17:46:14,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 17:46:14,169 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.3636363636363638) internal successors, (74), 21 states have internal predecessors, (74), 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 89 [2022-03-20 17:46:14,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:14,169 INFO L225 Difference]: With dead ends: 169 [2022-03-20 17:46:14,169 INFO L226 Difference]: Without dead ends: 99 [2022-03-20 17:46:14,171 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2555 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1321, Invalid=4841, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 17:46:14,171 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 226 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:14,172 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 50 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:14,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-20 17:46:14,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2022-03-20 17:46:14,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 91 states have (on average 1.2637362637362637) internal successors, (115), 91 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:14,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 120 transitions. [2022-03-20 17:46:14,185 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 120 transitions. Word has length 89 [2022-03-20 17:46:14,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:14,185 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 120 transitions. [2022-03-20 17:46:14,185 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.3636363636363638) internal successors, (74), 21 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:14,185 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 120 transitions. [2022-03-20 17:46:14,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-03-20 17:46:14,186 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:14,186 INFO L499 BasicCegarLoop]: trace histogram [18, 18, 18, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:14,204 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:14,399 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-20 17:46:14,400 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:14,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:14,400 INFO L85 PathProgramCache]: Analyzing trace with hash 576720250, now seen corresponding path program 41 times [2022-03-20 17:46:14,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:14,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1917345712] [2022-03-20 17:46:14,401 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:14,401 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:14,401 INFO L85 PathProgramCache]: Analyzing trace with hash 576720250, now seen corresponding path program 42 times [2022-03-20 17:46:14,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:14,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971245825] [2022-03-20 17:46:14,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:14,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:14,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:14,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:14,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:14,685 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 1 proven. 477 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:14,685 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:14,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971245825] [2022-03-20 17:46:14,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971245825] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:14,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280580860] [2022-03-20 17:46:14,685 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:14,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:14,685 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:14,686 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:14,687 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 17:46:14,821 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:46:14,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:14,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:46:14,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:14,957 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 513 trivial. 0 not checked. [2022-03-20 17:46:14,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:15,080 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 513 trivial. 0 not checked. [2022-03-20 17:46:15,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280580860] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:15,080 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:15,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 5, 5] total 29 [2022-03-20 17:46:15,081 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:15,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1917345712] [2022-03-20 17:46:15,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1917345712] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:15,081 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:15,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 17:46:15,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179010936] [2022-03-20 17:46:15,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:15,081 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 17:46:15,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:15,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 17:46:15,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=516, Unknown=0, NotChecked=0, Total=812 [2022-03-20 17:46:15,082 INFO L87 Difference]: Start difference. First operand 97 states and 120 transitions. Second operand has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:15,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:15,481 INFO L93 Difference]: Finished difference Result 175 states and 222 transitions. [2022-03-20 17:46:15,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 17:46:15,482 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 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 92 [2022-03-20 17:46:15,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:15,484 INFO L225 Difference]: With dead ends: 175 [2022-03-20 17:46:15,484 INFO L226 Difference]: Without dead ends: 102 [2022-03-20 17:46:15,485 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=796, Invalid=1556, Unknown=0, NotChecked=0, Total=2352 [2022-03-20 17:46:15,485 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 228 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:15,486 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 45 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:15,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-20 17:46:15,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2022-03-20 17:46:15,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 94 states have (on average 1.2659574468085106) internal successors, (119), 94 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:15,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 124 transitions. [2022-03-20 17:46:15,501 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 124 transitions. Word has length 92 [2022-03-20 17:46:15,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:15,502 INFO L478 AbstractCegarLoop]: Abstraction has 100 states and 124 transitions. [2022-03-20 17:46:15,502 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:15,502 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 124 transitions. [2022-03-20 17:46:15,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-03-20 17:46:15,502 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:15,502 INFO L499 BasicCegarLoop]: trace histogram [19, 19, 19, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:15,519 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-03-20 17:46:15,710 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:15,710 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:15,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:15,710 INFO L85 PathProgramCache]: Analyzing trace with hash 1272730321, now seen corresponding path program 43 times [2022-03-20 17:46:15,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:15,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [571864975] [2022-03-20 17:46:15,711 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:15,711 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:15,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1272730321, now seen corresponding path program 44 times [2022-03-20 17:46:15,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:15,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313846359] [2022-03-20 17:46:15,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:15,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:15,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:16,003 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:16,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:16,005 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 1 proven. 532 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:16,006 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:16,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313846359] [2022-03-20 17:46:16,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313846359] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:16,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524575225] [2022-03-20 17:46:16,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:16,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:16,006 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:16,007 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:16,007 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 17:46:16,170 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:16,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:16,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 17:46:16,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:16,632 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 1 proven. 532 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:16,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:17,016 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 1 proven. 532 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 17:46:17,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [524575225] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:17,016 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:17,016 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 65 [2022-03-20 17:46:17,016 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:17,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [571864975] [2022-03-20 17:46:17,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [571864975] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:17,016 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:17,016 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 17:46:17,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325655047] [2022-03-20 17:46:17,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:17,017 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 17:46:17,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:17,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 17:46:17,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1388, Invalid=2772, Unknown=0, NotChecked=0, Total=4160 [2022-03-20 17:46:17,018 INFO L87 Difference]: Start difference. First operand 100 states and 124 transitions. Second operand has 24 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:17,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:17,486 INFO L93 Difference]: Finished difference Result 179 states and 227 transitions. [2022-03-20 17:46:17,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 17:46:17,486 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 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 95 [2022-03-20 17:46:17,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:17,487 INFO L225 Difference]: With dead ends: 179 [2022-03-20 17:46:17,487 INFO L226 Difference]: Without dead ends: 103 [2022-03-20 17:46:17,488 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2481 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2333, Invalid=4977, Unknown=0, NotChecked=0, Total=7310 [2022-03-20 17:46:17,489 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 216 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:17,489 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 40 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:17,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-03-20 17:46:17,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-03-20 17:46:17,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 97 states have (on average 1.268041237113402) internal successors, (123), 97 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:17,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 128 transitions. [2022-03-20 17:46:17,520 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 128 transitions. Word has length 95 [2022-03-20 17:46:17,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:17,520 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 128 transitions. [2022-03-20 17:46:17,520 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:17,520 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 128 transitions. [2022-03-20 17:46:17,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-03-20 17:46:17,520 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:17,521 INFO L499 BasicCegarLoop]: trace histogram [20, 20, 20, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:17,538 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-03-20 17:46:17,727 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-03-20 17:46:17,727 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:17,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:17,728 INFO L85 PathProgramCache]: Analyzing trace with hash 6650394, now seen corresponding path program 45 times [2022-03-20 17:46:17,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:17,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [335241185] [2022-03-20 17:46:17,729 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:17,729 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:17,729 INFO L85 PathProgramCache]: Analyzing trace with hash 6650394, now seen corresponding path program 46 times [2022-03-20 17:46:17,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:17,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717782630] [2022-03-20 17:46:17,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:17,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:17,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:17,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:17,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:17,788 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 626 trivial. 0 not checked. [2022-03-20 17:46:17,788 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:17,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717782630] [2022-03-20 17:46:17,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717782630] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:17,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977065962] [2022-03-20 17:46:17,788 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:17,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:17,789 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:17,790 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:17,790 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 17:46:17,956 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:17,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:17,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 17:46:17,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:18,284 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 533 proven. 59 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:18,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:18,586 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 533 proven. 59 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-03-20 17:46:18,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977065962] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:18,586 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:18,586 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 25, 25] total 50 [2022-03-20 17:46:18,586 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:18,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [335241185] [2022-03-20 17:46:18,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [335241185] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:18,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:18,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 17:46:18,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603544851] [2022-03-20 17:46:18,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:18,587 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 17:46:18,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:18,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 17:46:18,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=814, Invalid=1636, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 17:46:18,588 INFO L87 Difference]: Start difference. First operand 103 states and 128 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:18,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:18,725 INFO L93 Difference]: Finished difference Result 258 states and 330 transitions. [2022-03-20 17:46:18,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 17:46:18,725 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2022-03-20 17:46:18,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:18,726 INFO L225 Difference]: With dead ends: 258 [2022-03-20 17:46:18,726 INFO L226 Difference]: Without dead ends: 242 [2022-03-20 17:46:18,727 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1137 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=832, Invalid=1924, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 17:46:18,727 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 121 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:18,727 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 29 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:18,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2022-03-20 17:46:18,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 166. [2022-03-20 17:46:18,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 160 states have (on average 1.29375) internal successors, (207), 160 states have internal predecessors, (207), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:18,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 212 transitions. [2022-03-20 17:46:18,780 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 212 transitions. Word has length 98 [2022-03-20 17:46:18,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:18,780 INFO L478 AbstractCegarLoop]: Abstraction has 166 states and 212 transitions. [2022-03-20 17:46:18,780 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:18,780 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 212 transitions. [2022-03-20 17:46:18,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-03-20 17:46:18,781 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:18,781 INFO L499 BasicCegarLoop]: trace histogram [40, 40, 40, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:18,798 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:18,984 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:18,984 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:18,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:18,984 INFO L85 PathProgramCache]: Analyzing trace with hash 576417944, now seen corresponding path program 47 times [2022-03-20 17:46:18,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:18,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [516044617] [2022-03-20 17:46:18,985 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:18,985 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:18,985 INFO L85 PathProgramCache]: Analyzing trace with hash 576417944, now seen corresponding path program 48 times [2022-03-20 17:46:18,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:18,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73774881] [2022-03-20 17:46:18,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:18,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:19,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:19,084 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:19,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:19,087 INFO L134 CoverageAnalysis]: Checked inductivity of 2461 backedges. 0 proven. 1245 refuted. 0 times theorem prover too weak. 1216 trivial. 0 not checked. [2022-03-20 17:46:19,087 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:19,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73774881] [2022-03-20 17:46:19,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73774881] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:19,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075861394] [2022-03-20 17:46:19,088 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:19,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:19,088 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:19,092 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:19,093 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 17:46:19,269 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:46:19,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:19,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:46:19,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:19,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2461 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2460 trivial. 0 not checked. [2022-03-20 17:46:19,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:19,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2461 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2460 trivial. 0 not checked. [2022-03-20 17:46:19,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075861394] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:19,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:19,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2022-03-20 17:46:19,681 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:19,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [516044617] [2022-03-20 17:46:19,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [516044617] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:19,681 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:19,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 17:46:19,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203474955] [2022-03-20 17:46:19,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:19,682 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 17:46:19,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:19,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 17:46:19,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2022-03-20 17:46:19,682 INFO L87 Difference]: Start difference. First operand 166 states and 212 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:19,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:19,869 INFO L93 Difference]: Finished difference Result 329 states and 424 transitions. [2022-03-20 17:46:19,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 17:46:19,870 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 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 161 [2022-03-20 17:46:19,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:19,871 INFO L225 Difference]: With dead ends: 329 [2022-03-20 17:46:19,871 INFO L226 Difference]: Without dead ends: 313 [2022-03-20 17:46:19,871 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2022-03-20 17:46:19,871 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 131 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:19,872 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 39 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:19,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2022-03-20 17:46:19,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 229. [2022-03-20 17:46:19,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 223 states have (on average 1.304932735426009) internal successors, (291), 223 states have internal predecessors, (291), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:19,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 296 transitions. [2022-03-20 17:46:19,913 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 296 transitions. Word has length 161 [2022-03-20 17:46:19,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:19,913 INFO L478 AbstractCegarLoop]: Abstraction has 229 states and 296 transitions. [2022-03-20 17:46:19,913 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:19,914 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 296 transitions. [2022-03-20 17:46:19,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2022-03-20 17:46:19,915 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:19,915 INFO L499 BasicCegarLoop]: trace histogram [60, 60, 60, 5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:19,934 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:20,131 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-03-20 17:46:20,132 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:20,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:20,132 INFO L85 PathProgramCache]: Analyzing trace with hash 54436442, now seen corresponding path program 49 times [2022-03-20 17:46:20,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:20,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [967734039] [2022-03-20 17:46:20,133 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:20,133 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:20,133 INFO L85 PathProgramCache]: Analyzing trace with hash 54436442, now seen corresponding path program 50 times [2022-03-20 17:46:20,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:20,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810790034] [2022-03-20 17:46:20,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:20,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:20,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:20,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:20,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:20,295 INFO L134 CoverageAnalysis]: Checked inductivity of 5538 backedges. 0 proven. 3732 refuted. 0 times theorem prover too weak. 1806 trivial. 0 not checked. [2022-03-20 17:46:20,296 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:20,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810790034] [2022-03-20 17:46:20,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810790034] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:20,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693232295] [2022-03-20 17:46:20,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:20,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:20,296 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:20,297 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:20,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 17:46:20,646 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:20,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:20,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 1405 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 17:46:20,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:21,251 INFO L134 CoverageAnalysis]: Checked inductivity of 5538 backedges. 0 proven. 3732 refuted. 0 times theorem prover too weak. 1806 trivial. 0 not checked. [2022-03-20 17:46:21,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:21,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5538 backedges. 0 proven. 3732 refuted. 0 times theorem prover too weak. 1806 trivial. 0 not checked. [2022-03-20 17:46:21,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693232295] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:21,598 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:21,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 18 [2022-03-20 17:46:21,598 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:21,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [967734039] [2022-03-20 17:46:21,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [967734039] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:21,598 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:21,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 17:46:21,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129018793] [2022-03-20 17:46:21,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:21,599 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 17:46:21,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:21,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 17:46:21,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2022-03-20 17:46:21,599 INFO L87 Difference]: Start difference. First operand 229 states and 296 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:21,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:21,835 INFO L93 Difference]: Finished difference Result 400 states and 518 transitions. [2022-03-20 17:46:21,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 17:46:21,835 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 224 [2022-03-20 17:46:21,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:21,837 INFO L225 Difference]: With dead ends: 400 [2022-03-20 17:46:21,837 INFO L226 Difference]: Without dead ends: 384 [2022-03-20 17:46:21,838 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=183, Invalid=323, Unknown=0, NotChecked=0, Total=506 [2022-03-20 17:46:21,838 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 223 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:21,838 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 29 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:21,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2022-03-20 17:46:21,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 292. [2022-03-20 17:46:21,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 286 states have (on average 1.3111888111888113) internal successors, (375), 286 states have internal predecessors, (375), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:21,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 380 transitions. [2022-03-20 17:46:21,895 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 380 transitions. Word has length 224 [2022-03-20 17:46:21,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:21,895 INFO L478 AbstractCegarLoop]: Abstraction has 292 states and 380 transitions. [2022-03-20 17:46:21,895 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:21,895 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 380 transitions. [2022-03-20 17:46:21,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2022-03-20 17:46:21,897 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:21,897 INFO L499 BasicCegarLoop]: trace histogram [80, 80, 80, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:21,916 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-03-20 17:46:22,115 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:22,116 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:22,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:22,116 INFO L85 PathProgramCache]: Analyzing trace with hash -381796264, now seen corresponding path program 51 times [2022-03-20 17:46:22,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:22,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [800248586] [2022-03-20 17:46:22,117 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:22,117 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:22,117 INFO L85 PathProgramCache]: Analyzing trace with hash -381796264, now seen corresponding path program 52 times [2022-03-20 17:46:22,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:22,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024217147] [2022-03-20 17:46:22,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:22,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:22,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:22,332 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:22,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:22,337 INFO L134 CoverageAnalysis]: Checked inductivity of 9858 backedges. 0 proven. 7462 refuted. 0 times theorem prover too weak. 2396 trivial. 0 not checked. [2022-03-20 17:46:22,338 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:22,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024217147] [2022-03-20 17:46:22,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024217147] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:22,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250484445] [2022-03-20 17:46:22,338 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:22,338 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:22,338 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:22,350 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:22,351 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 17:46:22,691 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:22,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:22,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 1564 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 17:46:22,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:23,248 INFO L134 CoverageAnalysis]: Checked inductivity of 9858 backedges. 536 proven. 3599 refuted. 0 times theorem prover too weak. 5723 trivial. 0 not checked. [2022-03-20 17:46:23,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:23,808 INFO L134 CoverageAnalysis]: Checked inductivity of 9858 backedges. 536 proven. 3599 refuted. 0 times theorem prover too weak. 5723 trivial. 0 not checked. [2022-03-20 17:46:23,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250484445] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:23,809 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:23,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 25, 25] total 53 [2022-03-20 17:46:23,809 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:23,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [800248586] [2022-03-20 17:46:23,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [800248586] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:23,809 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:23,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 17:46:23,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299606768] [2022-03-20 17:46:23,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:23,809 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 17:46:23,809 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:23,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 17:46:23,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=1924, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 17:46:23,810 INFO L87 Difference]: Start difference. First operand 292 states and 380 transitions. Second operand has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:24,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:24,125 INFO L93 Difference]: Finished difference Result 406 states and 525 transitions. [2022-03-20 17:46:24,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 17:46:24,126 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 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 287 [2022-03-20 17:46:24,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:24,127 INFO L225 Difference]: With dead ends: 406 [2022-03-20 17:46:24,127 INFO L226 Difference]: Without dead ends: 390 [2022-03-20 17:46:24,128 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 590 GetRequests, 533 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=886, Invalid=2536, Unknown=0, NotChecked=0, Total=3422 [2022-03-20 17:46:24,128 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 220 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:24,128 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 34 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:24,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2022-03-20 17:46:24,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 355. [2022-03-20 17:46:24,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 349 states have (on average 1.3151862464183381) internal successors, (459), 349 states have internal predecessors, (459), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:24,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 464 transitions. [2022-03-20 17:46:24,210 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 464 transitions. Word has length 287 [2022-03-20 17:46:24,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:24,211 INFO L478 AbstractCegarLoop]: Abstraction has 355 states and 464 transitions. [2022-03-20 17:46:24,211 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:24,211 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 464 transitions. [2022-03-20 17:46:24,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2022-03-20 17:46:24,213 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:24,213 INFO L499 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:24,234 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:24,431 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:24,431 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:24,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:24,432 INFO L85 PathProgramCache]: Analyzing trace with hash 587258522, now seen corresponding path program 53 times [2022-03-20 17:46:24,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:24,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [301143939] [2022-03-20 17:46:24,433 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:24,433 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:24,433 INFO L85 PathProgramCache]: Analyzing trace with hash 587258522, now seen corresponding path program 54 times [2022-03-20 17:46:24,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:24,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774798673] [2022-03-20 17:46:24,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:24,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:24,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:24,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:24,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:24,655 INFO L134 CoverageAnalysis]: Checked inductivity of 15421 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:24,655 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:24,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774798673] [2022-03-20 17:46:24,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774798673] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:24,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317875432] [2022-03-20 17:46:24,655 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:24,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:24,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:24,657 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:24,658 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 17:46:24,942 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 17:46:24,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:24,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 17:46:24,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:25,411 INFO L134 CoverageAnalysis]: Checked inductivity of 15421 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:25,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:25,935 INFO L134 CoverageAnalysis]: Checked inductivity of 15421 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:25,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317875432] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:25,935 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:25,935 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 12 [2022-03-20 17:46:25,936 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:25,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [301143939] [2022-03-20 17:46:25,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [301143939] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:25,936 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:25,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 17:46:25,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945822725] [2022-03-20 17:46:25,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:25,936 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 17:46:25,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:25,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 17:46:25,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2022-03-20 17:46:25,937 INFO L87 Difference]: Start difference. First operand 355 states and 464 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:26,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:26,119 INFO L93 Difference]: Finished difference Result 379 states and 491 transitions. [2022-03-20 17:46:26,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 17:46:26,119 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 350 [2022-03-20 17:46:26,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:26,121 INFO L225 Difference]: With dead ends: 379 [2022-03-20 17:46:26,121 INFO L226 Difference]: Without dead ends: 368 [2022-03-20 17:46:26,121 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 709 GetRequests, 696 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=131, Unknown=0, NotChecked=0, Total=210 [2022-03-20 17:46:26,121 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 94 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:26,121 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 34 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:26,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2022-03-20 17:46:26,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 358. [2022-03-20 17:46:26,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 358 states, 352 states have (on average 1.3125) internal successors, (462), 352 states have internal predecessors, (462), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:26,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 467 transitions. [2022-03-20 17:46:26,209 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 467 transitions. Word has length 350 [2022-03-20 17:46:26,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:26,209 INFO L478 AbstractCegarLoop]: Abstraction has 358 states and 467 transitions. [2022-03-20 17:46:26,209 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:26,209 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 467 transitions. [2022-03-20 17:46:26,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 354 [2022-03-20 17:46:26,210 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:26,211 INFO L499 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:26,228 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-20 17:46:26,423 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:26,423 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:26,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:26,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1194423610, now seen corresponding path program 55 times [2022-03-20 17:46:26,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:26,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1201837101] [2022-03-20 17:46:26,425 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:26,425 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:26,425 INFO L85 PathProgramCache]: Analyzing trace with hash 1194423610, now seen corresponding path program 56 times [2022-03-20 17:46:26,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:26,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108581213] [2022-03-20 17:46:26,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:26,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:26,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:26,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:26,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:26,677 INFO L134 CoverageAnalysis]: Checked inductivity of 15425 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:26,677 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:26,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108581213] [2022-03-20 17:46:26,677 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108581213] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:26,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332135705] [2022-03-20 17:46:26,677 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:26,677 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:26,677 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:26,678 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:26,679 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 17:46:27,148 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:27,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:27,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 2151 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 17:46:27,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:27,616 INFO L134 CoverageAnalysis]: Checked inductivity of 15425 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:27,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:28,073 INFO L134 CoverageAnalysis]: Checked inductivity of 15425 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:28,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332135705] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:28,073 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:28,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 14 [2022-03-20 17:46:28,074 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:28,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1201837101] [2022-03-20 17:46:28,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1201837101] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:28,074 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:28,074 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 17:46:28,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954211366] [2022-03-20 17:46:28,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:28,074 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 17:46:28,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:28,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 17:46:28,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=113, Unknown=0, NotChecked=0, Total=182 [2022-03-20 17:46:28,075 INFO L87 Difference]: Start difference. First operand 358 states and 467 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:28,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:28,281 INFO L93 Difference]: Finished difference Result 386 states and 499 transitions. [2022-03-20 17:46:28,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 17:46:28,282 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 353 [2022-03-20 17:46:28,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:28,283 INFO L225 Difference]: With dead ends: 386 [2022-03-20 17:46:28,283 INFO L226 Difference]: Without dead ends: 375 [2022-03-20 17:46:28,283 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 717 GetRequests, 701 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=113, Invalid=193, Unknown=0, NotChecked=0, Total=306 [2022-03-20 17:46:28,284 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 123 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:28,284 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 44 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:28,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2022-03-20 17:46:28,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 361. [2022-03-20 17:46:28,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 355 states have (on average 1.3098591549295775) internal successors, (465), 355 states have internal predecessors, (465), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:28,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 470 transitions. [2022-03-20 17:46:28,359 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 470 transitions. Word has length 353 [2022-03-20 17:46:28,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:28,359 INFO L478 AbstractCegarLoop]: Abstraction has 361 states and 470 transitions. [2022-03-20 17:46:28,359 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:28,359 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 470 transitions. [2022-03-20 17:46:28,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2022-03-20 17:46:28,360 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:28,360 INFO L499 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:28,381 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-03-20 17:46:28,579 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-03-20 17:46:28,579 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:28,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:28,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1152690534, now seen corresponding path program 57 times [2022-03-20 17:46:28,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:28,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1499615748] [2022-03-20 17:46:28,581 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:28,581 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:28,581 INFO L85 PathProgramCache]: Analyzing trace with hash -1152690534, now seen corresponding path program 58 times [2022-03-20 17:46:28,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:28,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638120178] [2022-03-20 17:46:28,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:28,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:28,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:28,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:28,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:28,826 INFO L134 CoverageAnalysis]: Checked inductivity of 15432 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:28,826 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:28,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638120178] [2022-03-20 17:46:28,826 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638120178] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:28,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586598884] [2022-03-20 17:46:28,826 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:28,826 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:28,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:28,827 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:28,839 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 17:46:29,277 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:29,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:29,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 1958 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 17:46:29,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:29,956 INFO L134 CoverageAnalysis]: Checked inductivity of 15432 backedges. 537 proven. 4790 refuted. 0 times theorem prover too weak. 10105 trivial. 0 not checked. [2022-03-20 17:46:29,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:30,625 INFO L134 CoverageAnalysis]: Checked inductivity of 15432 backedges. 537 proven. 4790 refuted. 0 times theorem prover too weak. 10105 trivial. 0 not checked. [2022-03-20 17:46:30,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1586598884] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:30,625 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:30,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 27, 27] total 54 [2022-03-20 17:46:30,626 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:30,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1499615748] [2022-03-20 17:46:30,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1499615748] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:30,626 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:30,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 17:46:30,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947074428] [2022-03-20 17:46:30,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:30,626 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 17:46:30,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:30,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 17:46:30,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2044, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 17:46:30,627 INFO L87 Difference]: Start difference. First operand 361 states and 470 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:30,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:30,863 INFO L93 Difference]: Finished difference Result 393 states and 507 transitions. [2022-03-20 17:46:30,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 17:46:30,863 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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 356 [2022-03-20 17:46:30,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:30,868 INFO L225 Difference]: With dead ends: 393 [2022-03-20 17:46:30,868 INFO L226 Difference]: Without dead ends: 382 [2022-03-20 17:46:30,869 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 725 GetRequests, 668 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1523 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=894, Invalid=2528, Unknown=0, NotChecked=0, Total=3422 [2022-03-20 17:46:30,870 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 154 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:30,870 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 39 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:30,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2022-03-20 17:46:30,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 364. [2022-03-20 17:46:30,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 358 states have (on average 1.3072625698324023) internal successors, (468), 358 states have internal predecessors, (468), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:30,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 473 transitions. [2022-03-20 17:46:30,958 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 473 transitions. Word has length 356 [2022-03-20 17:46:30,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:30,958 INFO L478 AbstractCegarLoop]: Abstraction has 364 states and 473 transitions. [2022-03-20 17:46:30,958 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:30,958 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 473 transitions. [2022-03-20 17:46:30,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2022-03-20 17:46:30,960 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:30,960 INFO L499 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:30,979 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-03-20 17:46:31,166 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-03-20 17:46:31,166 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:31,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:31,167 INFO L85 PathProgramCache]: Analyzing trace with hash -1962575558, now seen corresponding path program 59 times [2022-03-20 17:46:31,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:31,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [822523070] [2022-03-20 17:46:31,168 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:31,168 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:31,168 INFO L85 PathProgramCache]: Analyzing trace with hash -1962575558, now seen corresponding path program 60 times [2022-03-20 17:46:31,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:31,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835862287] [2022-03-20 17:46:31,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:31,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:31,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:31,396 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:31,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:31,399 INFO L134 CoverageAnalysis]: Checked inductivity of 15442 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:31,399 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:31,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835862287] [2022-03-20 17:46:31,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835862287] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:31,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437530318] [2022-03-20 17:46:31,399 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:31,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:31,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:31,400 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:31,426 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-20 17:46:32,919 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2022-03-20 17:46:32,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:32,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 17:46:32,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:33,470 INFO L134 CoverageAnalysis]: Checked inductivity of 15442 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:33,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:33,978 INFO L134 CoverageAnalysis]: Checked inductivity of 15442 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:33,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437530318] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:33,979 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:33,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 20 [2022-03-20 17:46:33,979 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:33,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [822523070] [2022-03-20 17:46:33,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [822523070] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:33,979 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:33,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 17:46:33,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656526970] [2022-03-20 17:46:33,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:33,980 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 17:46:33,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:33,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 17:46:33,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=231, Unknown=0, NotChecked=0, Total=380 [2022-03-20 17:46:33,980 INFO L87 Difference]: Start difference. First operand 364 states and 473 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:34,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:34,240 INFO L93 Difference]: Finished difference Result 464 states and 600 transitions. [2022-03-20 17:46:34,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 17:46:34,241 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 359 [2022-03-20 17:46:34,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:34,242 INFO L225 Difference]: With dead ends: 464 [2022-03-20 17:46:34,242 INFO L226 Difference]: Without dead ends: 453 [2022-03-20 17:46:34,243 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 733 GetRequests, 709 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=239, Invalid=411, Unknown=0, NotChecked=0, Total=650 [2022-03-20 17:46:34,243 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 201 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:34,243 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 44 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:34,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2022-03-20 17:46:34,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 367. [2022-03-20 17:46:34,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 361 states have (on average 1.3047091412742382) internal successors, (471), 361 states have internal predecessors, (471), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:34,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 476 transitions. [2022-03-20 17:46:34,326 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 476 transitions. Word has length 359 [2022-03-20 17:46:34,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:34,327 INFO L478 AbstractCegarLoop]: Abstraction has 367 states and 476 transitions. [2022-03-20 17:46:34,327 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:34,327 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 476 transitions. [2022-03-20 17:46:34,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2022-03-20 17:46:34,328 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:34,328 INFO L499 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:34,348 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-03-20 17:46:34,537 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:34,537 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:34,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:34,538 INFO L85 PathProgramCache]: Analyzing trace with hash -121056614, now seen corresponding path program 61 times [2022-03-20 17:46:34,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:34,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1909370854] [2022-03-20 17:46:34,539 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:34,539 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:34,539 INFO L85 PathProgramCache]: Analyzing trace with hash -121056614, now seen corresponding path program 62 times [2022-03-20 17:46:34,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:34,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109616424] [2022-03-20 17:46:34,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:34,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:34,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:34,765 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:34,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:34,767 INFO L134 CoverageAnalysis]: Checked inductivity of 15455 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:34,767 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:34,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109616424] [2022-03-20 17:46:34,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109616424] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:34,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611969766] [2022-03-20 17:46:34,768 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:34,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:34,768 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:34,769 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:34,770 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-20 17:46:35,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:35,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:35,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 2193 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 17:46:35,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:35,799 INFO L134 CoverageAnalysis]: Checked inductivity of 15455 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:35,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:36,348 INFO L134 CoverageAnalysis]: Checked inductivity of 15455 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:36,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611969766] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:36,349 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:36,349 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 23 [2022-03-20 17:46:36,349 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:36,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1909370854] [2022-03-20 17:46:36,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1909370854] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:36,349 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:36,349 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 17:46:36,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129672424] [2022-03-20 17:46:36,349 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:36,350 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 17:46:36,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:36,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 17:46:36,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=305, Unknown=0, NotChecked=0, Total=506 [2022-03-20 17:46:36,350 INFO L87 Difference]: Start difference. First operand 367 states and 476 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:36,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:36,672 INFO L93 Difference]: Finished difference Result 539 states and 699 transitions. [2022-03-20 17:46:36,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 17:46:36,673 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 362 [2022-03-20 17:46:36,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:36,675 INFO L225 Difference]: With dead ends: 539 [2022-03-20 17:46:36,675 INFO L226 Difference]: Without dead ends: 528 [2022-03-20 17:46:36,675 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 741 GetRequests, 713 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=320, Invalid=550, Unknown=0, NotChecked=0, Total=870 [2022-03-20 17:46:36,675 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 237 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:36,675 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 47 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:36,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2022-03-20 17:46:36,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 370. [2022-03-20 17:46:36,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 364 states have (on average 1.3021978021978022) internal successors, (474), 364 states have internal predecessors, (474), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:36,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 479 transitions. [2022-03-20 17:46:36,788 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 479 transitions. Word has length 362 [2022-03-20 17:46:36,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:36,789 INFO L478 AbstractCegarLoop]: Abstraction has 370 states and 479 transitions. [2022-03-20 17:46:36,789 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:36,789 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 479 transitions. [2022-03-20 17:46:36,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2022-03-20 17:46:36,790 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:36,790 INFO L499 BasicCegarLoop]: trace histogram [100, 100, 100, 6, 6, 6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:36,812 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:36,993 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-03-20 17:46:36,993 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:36,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:36,993 INFO L85 PathProgramCache]: Analyzing trace with hash 952532282, now seen corresponding path program 63 times [2022-03-20 17:46:36,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:36,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [649285924] [2022-03-20 17:46:36,994 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:36,994 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:36,995 INFO L85 PathProgramCache]: Analyzing trace with hash 952532282, now seen corresponding path program 64 times [2022-03-20 17:46:36,995 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:36,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266701110] [2022-03-20 17:46:36,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:36,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:37,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:37,237 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:37,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:37,241 INFO L134 CoverageAnalysis]: Checked inductivity of 15471 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:37,241 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:37,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266701110] [2022-03-20 17:46:37,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266701110] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:37,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297344805] [2022-03-20 17:46:37,241 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:37,241 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:37,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:37,256 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:37,258 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-20 17:46:37,748 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:37,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:37,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 2000 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-20 17:46:37,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:38,521 INFO L134 CoverageAnalysis]: Checked inductivity of 15471 backedges. 537 proven. 4829 refuted. 0 times theorem prover too weak. 10105 trivial. 0 not checked. [2022-03-20 17:46:38,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:39,191 INFO L134 CoverageAnalysis]: Checked inductivity of 15471 backedges. 537 proven. 4829 refuted. 0 times theorem prover too weak. 10105 trivial. 0 not checked. [2022-03-20 17:46:39,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297344805] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:39,191 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:39,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 30, 30] total 60 [2022-03-20 17:46:39,191 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:39,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [649285924] [2022-03-20 17:46:39,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [649285924] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:39,191 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:39,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 17:46:39,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229470029] [2022-03-20 17:46:39,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:39,192 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 17:46:39,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:39,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 17:46:39,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=872, Invalid=2668, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 17:46:39,193 INFO L87 Difference]: Start difference. First operand 370 states and 479 transitions. Second operand has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:39,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:39,625 INFO L93 Difference]: Finished difference Result 614 states and 798 transitions. [2022-03-20 17:46:39,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 17:46:39,625 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 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 365 [2022-03-20 17:46:39,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:39,627 INFO L225 Difference]: With dead ends: 614 [2022-03-20 17:46:39,627 INFO L226 Difference]: Without dead ends: 603 [2022-03-20 17:46:39,627 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 749 GetRequests, 683 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2027 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1053, Invalid=3503, Unknown=0, NotChecked=0, Total=4556 [2022-03-20 17:46:39,628 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 280 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:39,628 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [280 Valid, 42 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 17:46:39,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2022-03-20 17:46:39,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 373. [2022-03-20 17:46:39,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 373 states, 367 states have (on average 1.2997275204359673) internal successors, (477), 367 states have internal predecessors, (477), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 17:46:39,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 482 transitions. [2022-03-20 17:46:39,715 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 482 transitions. Word has length 365 [2022-03-20 17:46:39,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:39,715 INFO L478 AbstractCegarLoop]: Abstraction has 373 states and 482 transitions. [2022-03-20 17:46:39,715 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 17:46:39,715 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 482 transitions. [2022-03-20 17:46:39,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2022-03-20 17:46:39,716 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:39,716 INFO L499 BasicCegarLoop]: trace histogram [100, 100, 100, 7, 7, 7, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:39,737 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:39,920 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-03-20 17:46:39,921 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:39,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:39,921 INFO L85 PathProgramCache]: Analyzing trace with hash -382120294, now seen corresponding path program 65 times [2022-03-20 17:46:39,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:39,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [663932428] [2022-03-20 17:46:39,922 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:39,922 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:39,922 INFO L85 PathProgramCache]: Analyzing trace with hash -382120294, now seen corresponding path program 66 times [2022-03-20 17:46:39,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:39,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425392798] [2022-03-20 17:46:39,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:39,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:40,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:40,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:40,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:40,147 INFO L134 CoverageAnalysis]: Checked inductivity of 15490 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 15420 trivial. 0 not checked. [2022-03-20 17:46:40,147 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:40,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425392798] [2022-03-20 17:46:40,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425392798] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:40,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043348016] [2022-03-20 17:46:40,148 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:40,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:40,148 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:40,149 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 17:46:40,149 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-20 17:46:51,102 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2022-03-20 17:46:51,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:51,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 671 conjuncts, 64 conjunts are in the unsatisfiable core [2022-03-20 17:46:51,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:51,211 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2022-03-20 17:46:51,303 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-03-20 17:46:51,303 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 47 [2022-03-20 17:46:51,426 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-03-20 17:46:51,426 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 47 [2022-03-20 17:46:51,529 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-03-20 17:46:51,530 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 47 [2022-03-20 17:46:51,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:51,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:51,616 INFO L173 IndexEqualityManager]: detected equality via solver [2022-03-20 17:46:51,617 INFO L173 IndexEqualityManager]: detected equality via solver [2022-03-20 17:46:51,620 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-03-20 17:46:51,620 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 50 treesize of output 58 [2022-03-20 17:46:51,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:51,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:51,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:51,813 INFO L173 IndexEqualityManager]: detected equality via solver [2022-03-20 17:46:51,814 INFO L173 IndexEqualityManager]: detected equality via solver [2022-03-20 17:46:51,817 INFO L356 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-03-20 17:46:51,817 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 62 treesize of output 73 [2022-03-20 17:46:52,334 INFO L173 IndexEqualityManager]: detected equality via solver [2022-03-20 17:46:52,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:52,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:52,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:52,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:52,338 INFO L173 IndexEqualityManager]: detected equality via solver [2022-03-20 17:46:52,339 INFO L173 IndexEqualityManager]: detected equality via solver [2022-03-20 17:46:52,368 INFO L356 Elim1Store]: treesize reduction 99, result has 19.5 percent of original size [2022-03-20 17:46:52,369 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 5 disjoint index pairs (out of 21 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 81 treesize of output 91 [2022-03-20 17:46:52,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 17:46:52,557 INFO L356 Elim1Store]: treesize reduction 50, result has 35.1 percent of original size [2022-03-20 17:46:52,557 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 5 disjoint index pairs (out of 28 index pairs), introduced 10 new quantified variables, introduced 10 case distinctions, treesize of input 79 treesize of output 61 [2022-03-20 17:46:52,928 INFO L134 CoverageAnalysis]: Checked inductivity of 15490 backedges. 519 proven. 17 refuted. 0 times theorem prover too weak. 14954 trivial. 0 not checked. [2022-03-20 17:46:52,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:47:00,977 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_main_~x~0_1176 Int)) (or (not (<= v_main_~x~0_1176 (select (select |c_#memory_int| |c_main_~#Dest~0.base|) (+ (* c_main_~j~0 4) |c_main_~#Dest~0.offset|)))) (forall ((v_ArrVal_6099 Int)) (let ((.cse0 (store (select |c_#memory_int| |c_main_~#distance~0.base|) (+ (* v_main_~x~0_1176 4) |c_main_~#distance~0.offset|) v_ArrVal_6099))) (let ((.cse1 (store |c_#memory_int| |c_main_~#distance~0.base| .cse0)) (.cse2 (* c_main_~j~0 4))) (<= (select .cse0 (+ (* 4 (select (select .cse1 |c_main_~#Dest~0.base|) (+ .cse2 4 |c_main_~#Dest~0.offset|))) |c_main_~#distance~0.offset|)) (+ (select .cse0 (+ (* (select (select .cse1 |c_main_~#Source~0.base|) (+ |c_main_~#Source~0.offset| .cse2 4)) 4) |c_main_~#distance~0.offset|)) (select (select .cse1 |c_main_~#Weight~0.base|) (+ |c_main_~#Weight~0.offset| .cse2 4))))))))) is different from false [2022-03-20 17:47:02,996 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_main_~x~0_1176 Int) (v_ArrVal_6099 Int)) (or (let ((.cse0 (store (select |c_#memory_int| |c_main_~#distance~0.base|) (+ (* v_main_~x~0_1176 4) |c_main_~#distance~0.offset|) v_ArrVal_6099))) (let ((.cse1 (store |c_#memory_int| |c_main_~#distance~0.base| .cse0))) (<= (select .cse0 (+ (* (select (select .cse1 |c_main_~#Dest~0.base|) (+ 4 |c_main_~#Dest~0.offset|)) 4) |c_main_~#distance~0.offset|)) (+ (select (select .cse1 |c_main_~#Weight~0.base|) (+ |c_main_~#Weight~0.offset| 4)) (select .cse0 (+ (* (select (select .cse1 |c_main_~#Source~0.base|) (+ |c_main_~#Source~0.offset| 4)) 4) |c_main_~#distance~0.offset|)))))) (not (<= v_main_~x~0_1176 (select (select |c_#memory_int| |c_main_~#Dest~0.base|) |c_main_~#Dest~0.offset|))))) is different from false [2022-03-20 17:47:16,218 WARN L833 $PredicateComparison]: unable to prove that (forall ((main_~i~0 Int)) (or (not (< (+ main_~i~0 1) c_main_~nodecount~0)) (< (+ main_~i~0 2) c_main_~nodecount~0) (forall ((v_ArrVal_6098 Int) (v_ArrVal_6096 Int) (v_main_~x~0_1176 Int) (v_ArrVal_6099 Int)) (let ((.cse2 (let ((.cse3 (* main_~i~0 4))) (store (store (select |c_#memory_int| |c_main_~#distance~0.base|) (+ |c_main_~#distance~0.offset| .cse3) v_ArrVal_6096) (+ 4 |c_main_~#distance~0.offset| .cse3) v_ArrVal_6098)))) (or (let ((.cse0 (store .cse2 (+ (* v_main_~x~0_1176 4) |c_main_~#distance~0.offset|) v_ArrVal_6099))) (let ((.cse1 (store |c_#memory_int| |c_main_~#distance~0.base| .cse0))) (<= (select .cse0 (+ (* (select (select .cse1 |c_main_~#Dest~0.base|) (+ 4 |c_main_~#Dest~0.offset|)) 4) |c_main_~#distance~0.offset|)) (+ (select (select .cse1 |c_main_~#Weight~0.base|) (+ |c_main_~#Weight~0.offset| 4)) (select .cse0 (+ (* 4 (select (select .cse1 |c_main_~#Source~0.base|) (+ |c_main_~#Source~0.offset| 4))) |c_main_~#distance~0.offset|)))))) (not (<= v_main_~x~0_1176 (select (select (store |c_#memory_int| |c_main_~#distance~0.base| .cse2) |c_main_~#Dest~0.base|) |c_main_~#Dest~0.offset|))) (not (<= c_~INFINITY~0 v_ArrVal_6098)) (not (<= v_ArrVal_6096 c_~INFINITY~0))))))) is different from false [2022-03-20 17:47:17,255 INFO L356 Elim1Store]: treesize reduction 414, result has 23.8 percent of original size [2022-03-20 17:47:17,256 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 34154 treesize of output 15154