/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/in-de32.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 08:17:49,437 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 08:17:49,438 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 08:17:49,459 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 08:17:49,502 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 08:17:49,502 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 08:17:49,503 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 08:17:49,504 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-19 08:17:49,513 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 08:17:49,513 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 08:17:49,515 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 08:17:49,515 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 08:17:49,515 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 08:17:49,515 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 08:17:49,515 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 08:17:49,515 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 08:17:49,515 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 08:17:49,516 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 08:17:49,516 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 08:17:49,516 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 08:17:49,516 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 08:17:49,516 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 08:17:49,517 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 08:17:49,517 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:17:49,517 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 08:17:49,517 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 08:17:49,517 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 08:17:49,517 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 08:17:49,517 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 08:17:49,517 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 08:17:49,517 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 08:17:49,694 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 08:17:49,719 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 08:17:49,721 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 08:17:49,721 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 08:17:49,723 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 08:17:49,724 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de32.c [2022-03-19 08:17:49,770 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0d47fe0ff/dade45d589e944859244518235bb56a1/FLAG98ba2093a [2022-03-19 08:17:50,057 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 08:17:50,057 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de32.c [2022-03-19 08:17:50,062 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0d47fe0ff/dade45d589e944859244518235bb56a1/FLAG98ba2093a [2022-03-19 08:17:50,491 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0d47fe0ff/dade45d589e944859244518235bb56a1 [2022-03-19 08:17:50,492 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 08:17:50,493 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 08:17:50,504 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 08:17:50,505 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 08:17:50,507 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 08:17:50,507 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,508 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d20a780 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50, skipping insertion in model container [2022-03-19 08:17:50,508 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,512 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 08:17:50,519 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 08:17:50,681 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de32.c[368,381] [2022-03-19 08:17:50,708 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:17:50,713 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 08:17:50,731 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de32.c[368,381] [2022-03-19 08:17:50,748 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:17:50,756 INFO L208 MainTranslator]: Completed translation [2022-03-19 08:17:50,757 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50 WrapperNode [2022-03-19 08:17:50,757 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 08:17:50,759 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 08:17:50,759 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 08:17:50,760 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 08:17:50,767 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,767 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,772 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,772 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,783 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,786 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,792 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,795 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 08:17:50,796 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 08:17:50,796 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 08:17:50,796 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 08:17:50,797 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (1/1) ... [2022-03-19 08:17:50,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:17:50,809 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:50,848 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) [2022-03-19 08:17:50,868 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 [2022-03-19 08:17:50,877 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 08:17:50,877 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 08:17:50,878 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 08:17:50,878 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 08:17:50,878 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 08:17:50,878 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 08:17:50,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 08:17:50,879 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 08:17:50,879 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 08:17:50,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 08:17:50,922 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 08:17:50,924 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 08:17:51,057 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 08:17:51,061 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 08:17:51,061 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-03-19 08:17:51,062 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:17:51 BoogieIcfgContainer [2022-03-19 08:17:51,062 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 08:17:51,063 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 08:17:51,063 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 08:17:51,070 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 08:17:51,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 08:17:50" (1/3) ... [2022-03-19 08:17:51,071 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c2524ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:17:51, skipping insertion in model container [2022-03-19 08:17:51,071 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:17:50" (2/3) ... [2022-03-19 08:17:51,071 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c2524ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:17:51, skipping insertion in model container [2022-03-19 08:17:51,071 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:17:51" (3/3) ... [2022-03-19 08:17:51,072 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de32.c [2022-03-19 08:17:51,076 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 08:17:51,076 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 08:17:51,139 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 08:17:51,143 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 [2022-03-19 08:17:51,143 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 08:17:51,184 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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) [2022-03-19 08:17:51,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-19 08:17:51,189 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:51,189 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:51,190 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:51,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:51,194 INFO L85 PathProgramCache]: Analyzing trace with hash 1792812365, now seen corresponding path program 1 times [2022-03-19 08:17:51,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:51,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [582056168] [2022-03-19 08:17:51,213 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:17:51,214 INFO L85 PathProgramCache]: Analyzing trace with hash 1792812365, now seen corresponding path program 2 times [2022-03-19 08:17:51,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:51,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958379892] [2022-03-19 08:17:51,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:51,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:51,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:51,390 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:51,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:51,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:51,401 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:51,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958379892] [2022-03-19 08:17:51,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958379892] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:51,402 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:51,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:17:51,404 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:51,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [582056168] [2022-03-19 08:17:51,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [582056168] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:51,405 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:51,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:17:51,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107739016] [2022-03-19 08:17:51,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:51,408 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:17:51,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:51,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:17:51,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:17:51,426 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:51,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:51,583 INFO L93 Difference]: Finished difference Result 47 states and 64 transitions. [2022-03-19 08:17:51,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 08:17:51,585 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-03-19 08:17:51,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:51,589 INFO L225 Difference]: With dead ends: 47 [2022-03-19 08:17:51,589 INFO L226 Difference]: Without dead ends: 17 [2022-03-19 08:17:51,592 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-19 08:17:51,595 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 30 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:51,595 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 40 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:17:51,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-19 08:17:51,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-19 08:17:51,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:51,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-03-19 08:17:51,619 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 14 [2022-03-19 08:17:51,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:51,619 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-03-19 08:17:51,620 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:51,620 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-03-19 08:17:51,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-19 08:17:51,625 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:51,625 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:51,625 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 08:17:51,626 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:51,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:51,634 INFO L85 PathProgramCache]: Analyzing trace with hash -222896448, now seen corresponding path program 1 times [2022-03-19 08:17:51,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:51,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [648387320] [2022-03-19 08:17:51,635 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-19 08:17:51,635 INFO L85 PathProgramCache]: Analyzing trace with hash -222896448, now seen corresponding path program 2 times [2022-03-19 08:17:51,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:51,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943059633] [2022-03-19 08:17:51,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:51,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:51,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:51,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:51,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:51,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:51,683 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:51,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943059633] [2022-03-19 08:17:51,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943059633] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:51,683 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:51,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:17:51,684 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:51,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [648387320] [2022-03-19 08:17:51,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [648387320] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:51,684 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:51,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:17:51,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297829927] [2022-03-19 08:17:51,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:51,685 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 08:17:51,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:51,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 08:17:51,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 08:17:51,686 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:51,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:51,716 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2022-03-19 08:17:51,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 08:17:51,716 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 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 15 [2022-03-19 08:17:51,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:51,718 INFO L225 Difference]: With dead ends: 30 [2022-03-19 08:17:51,718 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 08:17:51,719 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-19 08:17:51,720 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 18 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:51,720 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 21 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:17:51,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 08:17:51,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-03-19 08:17:51,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:51,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-03-19 08:17:51,726 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 15 [2022-03-19 08:17:51,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:51,726 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-03-19 08:17:51,726 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:51,726 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-03-19 08:17:51,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-19 08:17:51,727 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:51,727 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:51,727 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-19 08:17:51,727 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:51,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:51,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1179931951, now seen corresponding path program 1 times [2022-03-19 08:17:51,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:51,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [919453477] [2022-03-19 08:17:51,917 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:51,918 INFO L85 PathProgramCache]: Analyzing trace with hash 115301550, now seen corresponding path program 1 times [2022-03-19 08:17:51,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:51,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824647397] [2022-03-19 08:17:51,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:51,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:51,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:52,124 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:52,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:52,143 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:52,144 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:52,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824647397] [2022-03-19 08:17:52,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824647397] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:52,144 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:52,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:17:52,287 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:52,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [919453477] [2022-03-19 08:17:52,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [919453477] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:52,287 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:52,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:17:52,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039280854] [2022-03-19 08:17:52,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:52,288 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 08:17:52,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:52,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 08:17:52,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-03-19 08:17:52,289 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 10 states, 10 states have (on average 1.1) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:52,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:52,424 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2022-03-19 08:17:52,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-19 08:17:52,425 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.1) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 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 15 [2022-03-19 08:17:52,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:52,425 INFO L225 Difference]: With dead ends: 29 [2022-03-19 08:17:52,426 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 08:17:52,427 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:17:52,428 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 18 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:52,428 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 55 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 58 Invalid, 0 Unknown, 36 Unchecked, 0.1s Time] [2022-03-19 08:17:52,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 08:17:52,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-19 08:17:52,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:52,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2022-03-19 08:17:52,434 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 15 [2022-03-19 08:17:52,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:52,434 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2022-03-19 08:17:52,434 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.1) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:52,434 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2022-03-19 08:17:52,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-19 08:17:52,435 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:52,435 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:52,436 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-19 08:17:52,436 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:52,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:52,436 INFO L85 PathProgramCache]: Analyzing trace with hash -639491699, now seen corresponding path program 2 times [2022-03-19 08:17:52,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:52,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [889679] [2022-03-19 08:17:52,608 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:52,609 INFO L85 PathProgramCache]: Analyzing trace with hash 1947567214, now seen corresponding path program 1 times [2022-03-19 08:17:52,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:52,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103274052] [2022-03-19 08:17:52,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:52,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:52,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:52,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:52,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:52,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:52,713 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:52,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103274052] [2022-03-19 08:17:52,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103274052] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:52,714 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:52,714 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:17:52,886 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:52,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [889679] [2022-03-19 08:17:52,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [889679] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:52,887 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:52,887 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:17:52,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595245925] [2022-03-19 08:17:52,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:52,887 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:17:52,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:52,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:17:52,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2022-03-19 08:17:52,888 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 11 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:52,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:52,990 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2022-03-19 08:17:52,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-19 08:17:52,991 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-19 08:17:52,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:52,991 INFO L225 Difference]: With dead ends: 29 [2022-03-19 08:17:52,991 INFO L226 Difference]: Without dead ends: 19 [2022-03-19 08:17:52,992 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:17:52,992 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 18 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:52,993 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 55 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 58 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2022-03-19 08:17:52,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-19 08:17:52,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2022-03-19 08:17:52,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:52,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-03-19 08:17:52,996 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 16 [2022-03-19 08:17:52,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:52,996 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-03-19 08:17:52,996 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:52,996 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-03-19 08:17:52,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-19 08:17:52,996 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:52,996 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:52,997 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-19 08:17:52,997 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:52,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:52,997 INFO L85 PathProgramCache]: Analyzing trace with hash 1314021247, now seen corresponding path program 1 times [2022-03-19 08:17:52,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:52,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [350061179] [2022-03-19 08:17:53,123 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:53,124 INFO L85 PathProgramCache]: Analyzing trace with hash -759458368, now seen corresponding path program 1 times [2022-03-19 08:17:53,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:53,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136316712] [2022-03-19 08:17:53,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:53,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:53,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:53,157 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:53,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:53,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:53,161 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:53,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136316712] [2022-03-19 08:17:53,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136316712] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:53,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:53,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:17:53,173 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:53,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [350061179] [2022-03-19 08:17:53,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [350061179] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:53,173 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:53,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:17:53,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010180939] [2022-03-19 08:17:53,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:53,173 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:17:53,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:53,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:17:53,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:17:53,174 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:53,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:53,238 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2022-03-19 08:17:53,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 08:17:53,238 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-19 08:17:53,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:53,239 INFO L225 Difference]: With dead ends: 24 [2022-03-19 08:17:53,239 INFO L226 Difference]: Without dead ends: 17 [2022-03-19 08:17:53,239 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2022-03-19 08:17:53,240 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 15 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:53,240 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 30 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:17:53,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-19 08:17:53,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-19 08:17:53,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:53,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-03-19 08:17:53,243 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 16 [2022-03-19 08:17:53,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:53,243 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-03-19 08:17:53,243 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:53,243 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-03-19 08:17:53,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-19 08:17:53,243 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:53,244 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:53,244 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-19 08:17:53,244 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:53,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:53,244 INFO L85 PathProgramCache]: Analyzing trace with hash -1578117650, now seen corresponding path program 1 times [2022-03-19 08:17:53,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:53,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [716619463] [2022-03-19 08:17:53,380 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:53,381 INFO L85 PathProgramCache]: Analyzing trace with hash 930401391, now seen corresponding path program 1 times [2022-03-19 08:17:53,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:53,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160682252] [2022-03-19 08:17:53,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:53,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:53,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:53,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:53,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:53,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:53,425 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:53,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160682252] [2022-03-19 08:17:53,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160682252] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:53,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70039436] [2022-03-19 08:17:53,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:53,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:17:53,425 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:53,427 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) [2022-03-19 08:17:53,428 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 08:17:53,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:53,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-19 08:17:53,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:17:53,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:53,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:17:53,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:53,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70039436] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:53,561 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 08:17:53,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 7 [2022-03-19 08:17:53,572 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:53,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [716619463] [2022-03-19 08:17:53,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [716619463] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:53,573 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:53,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:17:53,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414442334] [2022-03-19 08:17:53,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:53,573 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 08:17:53,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:53,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 08:17:53,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-03-19 08:17:53,574 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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) [2022-03-19 08:17:53,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:53,600 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2022-03-19 08:17:53,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 08:17:53,601 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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 16 [2022-03-19 08:17:53,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:53,601 INFO L225 Difference]: With dead ends: 23 [2022-03-19 08:17:53,601 INFO L226 Difference]: Without dead ends: 18 [2022-03-19 08:17:53,601 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:17:53,602 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 4 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:53,602 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 35 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:17:53,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-19 08:17:53,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-19 08:17:53,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:53,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2022-03-19 08:17:53,605 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2022-03-19 08:17:53,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:53,605 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2022-03-19 08:17:53,605 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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) [2022-03-19 08:17:53,605 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2022-03-19 08:17:53,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 08:17:53,606 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:53,606 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:53,625 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-19 08:17:53,822 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 [2022-03-19 08:17:53,823 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:53,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:53,823 INFO L85 PathProgramCache]: Analyzing trace with hash -1642511809, now seen corresponding path program 1 times [2022-03-19 08:17:53,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:53,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1162131701] [2022-03-19 08:17:53,963 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:53,963 INFO L85 PathProgramCache]: Analyzing trace with hash -879795298, now seen corresponding path program 1 times [2022-03-19 08:17:53,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:53,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007286840] [2022-03-19 08:17:53,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:53,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:53,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:54,047 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:54,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:54,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:54,058 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:54,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007286840] [2022-03-19 08:17:54,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007286840] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:54,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153043500] [2022-03-19 08:17:54,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:54,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:17:54,060 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:54,061 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) [2022-03-19 08:17:54,062 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 08:17:54,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:54,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 08:17:54,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:17:54,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:54,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:17:54,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:54,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153043500] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:17:54,269 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:17:54,269 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-19 08:17:54,282 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:54,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1162131701] [2022-03-19 08:17:54,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1162131701] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:54,282 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:54,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:17:54,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656986445] [2022-03-19 08:17:54,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:54,282 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:17:54,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:54,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:17:54,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-19 08:17:54,283 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 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) [2022-03-19 08:17:54,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:54,369 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-03-19 08:17:54,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 08:17:54,370 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 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 [2022-03-19 08:17:54,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:54,371 INFO L225 Difference]: With dead ends: 28 [2022-03-19 08:17:54,371 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 08:17:54,371 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2022-03-19 08:17:54,371 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 21 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:54,372 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 30 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:17:54,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 08:17:54,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2022-03-19 08:17:54,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:54,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-03-19 08:17:54,392 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 17 [2022-03-19 08:17:54,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:54,392 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-03-19 08:17:54,392 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 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) [2022-03-19 08:17:54,392 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-03-19 08:17:54,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-19 08:17:54,394 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:54,394 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:54,425 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 08:17:54,607 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 [2022-03-19 08:17:54,608 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:54,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:54,608 INFO L85 PathProgramCache]: Analyzing trace with hash 656236558, now seen corresponding path program 2 times [2022-03-19 08:17:54,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:54,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1397936286] [2022-03-19 08:17:54,742 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:54,742 INFO L85 PathProgramCache]: Analyzing trace with hash -510125361, now seen corresponding path program 1 times [2022-03-19 08:17:54,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:54,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633471452] [2022-03-19 08:17:54,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:54,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:54,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:54,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:54,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:54,836 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:54,836 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:54,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633471452] [2022-03-19 08:17:54,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633471452] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:54,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453551892] [2022-03-19 08:17:54,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:54,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:17:54,837 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:54,838 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) [2022-03-19 08:17:54,852 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 08:17:54,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:54,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 08:17:54,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:17:54,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:54,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:17:55,092 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:55,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453551892] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:17:55,093 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:17:55,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-19 08:17:55,108 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:55,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1397936286] [2022-03-19 08:17:55,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1397936286] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:55,109 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:55,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:17:55,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399251231] [2022-03-19 08:17:55,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:55,109 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:17:55,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:55,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:17:55,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-19 08:17:55,110 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:55,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:55,254 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2022-03-19 08:17:55,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-19 08:17:55,254 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-19 08:17:55,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:55,255 INFO L225 Difference]: With dead ends: 33 [2022-03-19 08:17:55,255 INFO L226 Difference]: Without dead ends: 20 [2022-03-19 08:17:55,255 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:17:55,256 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:55,256 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 38 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:17:55,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-19 08:17:55,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-19 08:17:55,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:55,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-03-19 08:17:55,259 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2022-03-19 08:17:55,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:55,260 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-03-19 08:17:55,260 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:55,260 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-03-19 08:17:55,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 08:17:55,260 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:55,260 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:55,291 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 08:17:55,460 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 [2022-03-19 08:17:55,461 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:55,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:55,461 INFO L85 PathProgramCache]: Analyzing trace with hash -1137046944, now seen corresponding path program 3 times [2022-03-19 08:17:55,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:55,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [483094448] [2022-03-19 08:17:55,635 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:55,636 INFO L85 PathProgramCache]: Analyzing trace with hash 987112064, now seen corresponding path program 1 times [2022-03-19 08:17:55,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:55,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818048472] [2022-03-19 08:17:55,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:55,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:55,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:55,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:55,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:55,721 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:55,722 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:55,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818048472] [2022-03-19 08:17:55,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818048472] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:55,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032969721] [2022-03-19 08:17:55,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:55,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:17:55,722 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:55,723 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) [2022-03-19 08:17:55,756 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 08:17:55,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:55,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 08:17:55,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:17:55,844 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:55,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:17:55,910 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:55,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032969721] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:17:55,911 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:17:55,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-19 08:17:55,938 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:55,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [483094448] [2022-03-19 08:17:55,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [483094448] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:55,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:55,938 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:17:55,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743355364] [2022-03-19 08:17:55,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:55,939 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 08:17:55,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:55,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 08:17:55,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:17:55,940 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:56,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:56,079 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-03-19 08:17:56,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-19 08:17:56,079 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-19 08:17:56,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:56,080 INFO L225 Difference]: With dead ends: 26 [2022-03-19 08:17:56,080 INFO L226 Difference]: Without dead ends: 21 [2022-03-19 08:17:56,080 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:17:56,080 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 46 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 [2022-03-19 08:17:56,080 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 46 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:17:56,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-19 08:17:56,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-19 08:17:56,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:56,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-03-19 08:17:56,084 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2022-03-19 08:17:56,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:56,084 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-03-19 08:17:56,084 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:56,084 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-03-19 08:17:56,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-19 08:17:56,085 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:56,085 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:56,103 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 08:17:56,302 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 [2022-03-19 08:17:56,302 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:56,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:56,303 INFO L85 PathProgramCache]: Analyzing trace with hash -854221811, now seen corresponding path program 4 times [2022-03-19 08:17:56,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:56,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [897603013] [2022-03-19 08:17:56,455 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:56,455 INFO L85 PathProgramCache]: Analyzing trace with hash 241557421, now seen corresponding path program 1 times [2022-03-19 08:17:56,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:56,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123468178] [2022-03-19 08:17:56,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:56,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:56,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:56,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:56,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:56,543 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:56,544 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:56,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123468178] [2022-03-19 08:17:56,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123468178] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:56,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378563915] [2022-03-19 08:17:56,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:56,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:17:56,544 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:56,545 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) [2022-03-19 08:17:56,559 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 08:17:56,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:56,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:17:56,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:17:56,651 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:56,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:17:56,696 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:56,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378563915] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:17:56,712 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:17:56,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2022-03-19 08:17:56,744 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:56,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [897603013] [2022-03-19 08:17:56,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [897603013] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:56,744 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:56,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:17:56,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373330656] [2022-03-19 08:17:56,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:56,745 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 08:17:56,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:56,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 08:17:56,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-03-19 08:17:56,745 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 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) [2022-03-19 08:17:56,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:56,886 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2022-03-19 08:17:56,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-19 08:17:56,886 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 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 [2022-03-19 08:17:56,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:56,886 INFO L225 Difference]: With dead ends: 34 [2022-03-19 08:17:56,887 INFO L226 Difference]: Without dead ends: 29 [2022-03-19 08:17:56,887 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:17:56,887 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 28 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:56,887 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 30 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:17:56,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-19 08:17:56,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2022-03-19 08:17:56,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:56,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2022-03-19 08:17:56,893 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 20 [2022-03-19 08:17:56,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:56,895 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2022-03-19 08:17:56,895 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 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) [2022-03-19 08:17:56,895 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2022-03-19 08:17:56,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 08:17:56,895 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:56,895 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:56,914 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 08:17:57,119 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 [2022-03-19 08:17:57,119 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:57,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:57,120 INFO L85 PathProgramCache]: Analyzing trace with hash -676577280, now seen corresponding path program 5 times [2022-03-19 08:17:57,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:57,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [353901753] [2022-03-19 08:17:57,322 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:57,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1629884576, now seen corresponding path program 1 times [2022-03-19 08:17:57,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:57,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124724383] [2022-03-19 08:17:57,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:57,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:57,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:57,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:57,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:57,427 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:57,427 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:57,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124724383] [2022-03-19 08:17:57,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124724383] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:57,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213967178] [2022-03-19 08:17:57,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:57,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:17:57,427 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:57,445 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) [2022-03-19 08:17:57,446 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 08:17:57,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:57,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:17:57,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:17:57,520 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:57,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:17:57,610 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:57,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213967178] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:17:57,610 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:17:57,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2022-03-19 08:17:57,643 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:57,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [353901753] [2022-03-19 08:17:57,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [353901753] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:57,643 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:57,643 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:17:57,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594341302] [2022-03-19 08:17:57,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:57,644 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:17:57,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:57,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:17:57,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:17:57,644 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:57,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:57,885 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2022-03-19 08:17:57,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 08:17:57,886 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-19 08:17:57,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:57,886 INFO L225 Difference]: With dead ends: 39 [2022-03-19 08:17:57,886 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 08:17:57,887 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 43 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2022-03-19 08:17:57,887 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:57,887 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 53 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:17:57,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 08:17:57,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-19 08:17:57,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:57,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-03-19 08:17:57,892 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 21 [2022-03-19 08:17:57,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:57,892 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-03-19 08:17:57,892 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:57,892 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-03-19 08:17:57,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 08:17:57,893 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:57,893 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:57,911 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 08:17:58,093 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 [2022-03-19 08:17:58,094 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:58,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:58,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1250397230, now seen corresponding path program 6 times [2022-03-19 08:17:58,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:58,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [102104743] [2022-03-19 08:17:58,169 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:58,169 INFO L85 PathProgramCache]: Analyzing trace with hash -469678193, now seen corresponding path program 1 times [2022-03-19 08:17:58,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:58,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899928711] [2022-03-19 08:17:58,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:58,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:58,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:58,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:58,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:58,247 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:58,247 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:58,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899928711] [2022-03-19 08:17:58,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899928711] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:58,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512165886] [2022-03-19 08:17:58,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:58,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:17:58,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:58,264 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) [2022-03-19 08:17:58,265 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 08:17:58,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:58,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:17:58,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:17:58,372 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:58,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:17:58,471 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:58,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512165886] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:17:58,471 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:17:58,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2022-03-19 08:17:58,535 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:17:58,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [102104743] [2022-03-19 08:17:58,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [102104743] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:17:58,536 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:17:58,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 08:17:58,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901394132] [2022-03-19 08:17:58,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:17:58,536 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 08:17:58,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:58,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 08:17:58,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2022-03-19 08:17:58,537 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:58,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:17:58,899 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2022-03-19 08:17:58,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 08:17:58,900 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-19 08:17:58,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:17:58,900 INFO L225 Difference]: With dead ends: 29 [2022-03-19 08:17:58,900 INFO L226 Difference]: Without dead ends: 24 [2022-03-19 08:17:58,901 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 39 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2022-03-19 08:17:58,901 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 19 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:17:58,901 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 56 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:17:58,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-19 08:17:58,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-19 08:17:58,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:58,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-03-19 08:17:58,906 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 22 [2022-03-19 08:17:58,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:17:58,906 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-03-19 08:17:58,906 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:17:58,906 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-03-19 08:17:58,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 08:17:58,906 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:17:58,906 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:17:58,927 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-19 08:17:59,119 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 [2022-03-19 08:17:59,119 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:17:59,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:17:59,120 INFO L85 PathProgramCache]: Analyzing trace with hash 142103551, now seen corresponding path program 7 times [2022-03-19 08:17:59,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:17:59,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [132829501] [2022-03-19 08:17:59,495 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:17:59,496 INFO L85 PathProgramCache]: Analyzing trace with hash 363359358, now seen corresponding path program 1 times [2022-03-19 08:17:59,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:17:59,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358553681] [2022-03-19 08:17:59,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:59,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:17:59,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:59,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:17:59,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:17:59,976 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:17:59,976 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:17:59,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358553681] [2022-03-19 08:17:59,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358553681] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:17:59,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677254869] [2022-03-19 08:17:59,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:17:59,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:17:59,976 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:17:59,977 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) [2022-03-19 08:17:59,978 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-19 08:18:00,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:00,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-19 08:18:00,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:00,438 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:00,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:00,489 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:00,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677254869] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:00,489 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:00,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2022-03-19 08:18:00,549 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:00,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [132829501] [2022-03-19 08:18:00,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [132829501] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:00,549 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:00,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 08:18:00,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443504624] [2022-03-19 08:18:00,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:00,549 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 08:18:00,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:00,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 08:18:00,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:18:00,550 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:02,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:02,333 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2022-03-19 08:18:02,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-19 08:18:02,333 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-19 08:18:02,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:02,334 INFO L225 Difference]: With dead ends: 40 [2022-03-19 08:18:02,334 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 08:18:02,334 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:18:02,335 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 30 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:02,335 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 40 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-19 08:18:02,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 08:18:02,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 26. [2022-03-19 08:18:02,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:02,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-03-19 08:18:02,339 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 23 [2022-03-19 08:18:02,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:02,339 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-03-19 08:18:02,339 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:02,339 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-03-19 08:18:02,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-19 08:18:02,340 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:02,340 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:02,370 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:02,549 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 [2022-03-19 08:18:02,549 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:02,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:02,549 INFO L85 PathProgramCache]: Analyzing trace with hash 144737870, now seen corresponding path program 8 times [2022-03-19 08:18:02,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:02,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [533744540] [2022-03-19 08:18:03,479 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:03,480 INFO L85 PathProgramCache]: Analyzing trace with hash 407768559, now seen corresponding path program 1 times [2022-03-19 08:18:03,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:03,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433123733] [2022-03-19 08:18:03,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:03,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:03,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:03,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:03,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:03,627 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:03,628 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:03,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433123733] [2022-03-19 08:18:03,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [433123733] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:03,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969169925] [2022-03-19 08:18:03,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:03,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:03,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:03,629 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) [2022-03-19 08:18:03,630 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-19 08:18:03,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:03,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-19 08:18:03,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:03,752 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:03,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:03,908 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:03,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969169925] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:03,909 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:03,909 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2022-03-19 08:18:03,983 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:03,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [533744540] [2022-03-19 08:18:03,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [533744540] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:03,983 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:03,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:18:03,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176924190] [2022-03-19 08:18:03,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:03,984 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:18:03,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:03,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:18:03,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:18:03,984 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:04,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:04,440 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2022-03-19 08:18:04,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 08:18:04,441 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-19 08:18:04,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:04,441 INFO L225 Difference]: With dead ends: 45 [2022-03-19 08:18:04,441 INFO L226 Difference]: Without dead ends: 26 [2022-03-19 08:18:04,455 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=177, Invalid=945, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 08:18:04,456 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 26 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:04,456 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 63 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:18:04,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-19 08:18:04,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-19 08:18:04,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:04,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-03-19 08:18:04,463 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 24 [2022-03-19 08:18:04,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:04,464 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-03-19 08:18:04,464 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:04,464 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-03-19 08:18:04,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-19 08:18:04,465 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:04,465 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:04,482 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:04,665 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 [2022-03-19 08:18:04,666 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:04,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:04,666 INFO L85 PathProgramCache]: Analyzing trace with hash -405165152, now seen corresponding path program 9 times [2022-03-19 08:18:04,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:04,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [974924661] [2022-03-19 08:18:04,792 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:04,793 INFO L85 PathProgramCache]: Analyzing trace with hash -264118944, now seen corresponding path program 1 times [2022-03-19 08:18:04,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:04,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212005336] [2022-03-19 08:18:04,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:04,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:04,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:04,883 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:04,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:04,886 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:04,887 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:04,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212005336] [2022-03-19 08:18:04,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212005336] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:04,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613376168] [2022-03-19 08:18:04,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:04,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:04,887 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:04,888 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) [2022-03-19 08:18:04,916 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-19 08:18:04,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:04,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-19 08:18:04,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:04,986 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:04,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:05,137 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:05,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613376168] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:05,138 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:05,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2022-03-19 08:18:05,299 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:05,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [974924661] [2022-03-19 08:18:05,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [974924661] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:05,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:05,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 08:18:05,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758697081] [2022-03-19 08:18:05,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:05,300 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 08:18:05,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:05,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 08:18:05,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:18:05,301 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:05,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:05,881 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2022-03-19 08:18:05,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 08:18:05,881 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-19 08:18:05,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:05,882 INFO L225 Difference]: With dead ends: 32 [2022-03-19 08:18:05,882 INFO L226 Difference]: Without dead ends: 27 [2022-03-19 08:18:05,882 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=821, Unknown=0, NotChecked=0, Total=992 [2022-03-19 08:18:05,882 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:05,883 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 61 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:18:05,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-19 08:18:05,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-19 08:18:05,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:05,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2022-03-19 08:18:05,887 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 25 [2022-03-19 08:18:05,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:05,887 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2022-03-19 08:18:05,887 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:05,888 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2022-03-19 08:18:05,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-19 08:18:05,888 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:05,888 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:05,905 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:06,103 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 [2022-03-19 08:18:06,103 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:06,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:06,104 INFO L85 PathProgramCache]: Analyzing trace with hash 359277261, now seen corresponding path program 10 times [2022-03-19 08:18:06,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:06,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [723828685] [2022-03-19 08:18:06,235 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:06,235 INFO L85 PathProgramCache]: Analyzing trace with hash 2122293453, now seen corresponding path program 1 times [2022-03-19 08:18:06,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:06,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124697404] [2022-03-19 08:18:06,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:06,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:06,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:06,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:06,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:06,327 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:06,327 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:06,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124697404] [2022-03-19 08:18:06,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124697404] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:06,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661611509] [2022-03-19 08:18:06,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:06,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:06,328 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:06,329 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) [2022-03-19 08:18:06,331 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-19 08:18:06,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:06,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:18:06,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:06,444 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:06,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:06,500 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:06,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661611509] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:06,500 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:06,500 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2022-03-19 08:18:06,666 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:06,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [723828685] [2022-03-19 08:18:06,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [723828685] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:06,667 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:06,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:18:06,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199164585] [2022-03-19 08:18:06,667 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:06,667 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:18:06,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:06,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:18:06,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-19 08:18:06,668 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:07,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:07,112 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2022-03-19 08:18:07,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 08:18:07,112 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-19 08:18:07,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:07,113 INFO L225 Difference]: With dead ends: 46 [2022-03-19 08:18:07,113 INFO L226 Difference]: Without dead ends: 41 [2022-03-19 08:18:07,113 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=155, Invalid=547, Unknown=0, NotChecked=0, Total=702 [2022-03-19 08:18:07,113 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 32 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:07,114 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 65 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:18:07,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-19 08:18:07,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2022-03-19 08:18:07,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:07,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2022-03-19 08:18:07,119 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 26 [2022-03-19 08:18:07,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:07,119 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2022-03-19 08:18:07,119 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:07,119 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2022-03-19 08:18:07,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 08:18:07,119 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:07,119 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:07,136 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-19 08:18:07,322 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 [2022-03-19 08:18:07,322 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:07,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:07,322 INFO L85 PathProgramCache]: Analyzing trace with hash -1712811712, now seen corresponding path program 11 times [2022-03-19 08:18:07,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:07,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1004668169] [2022-03-19 08:18:07,425 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:07,425 INFO L85 PathProgramCache]: Analyzing trace with hash 2113557376, now seen corresponding path program 1 times [2022-03-19 08:18:07,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:07,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108399792] [2022-03-19 08:18:07,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:07,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:07,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:07,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:07,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:07,577 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:07,577 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:07,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108399792] [2022-03-19 08:18:07,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108399792] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:07,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513538172] [2022-03-19 08:18:07,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:07,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:07,578 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:07,579 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) [2022-03-19 08:18:07,579 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-19 08:18:07,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:07,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:18:07,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:07,680 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:07,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:07,875 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:07,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513538172] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:07,875 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:07,875 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2022-03-19 08:18:08,033 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:08,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1004668169] [2022-03-19 08:18:08,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1004668169] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:08,033 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:08,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-19 08:18:08,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261656582] [2022-03-19 08:18:08,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:08,034 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-19 08:18:08,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:08,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-19 08:18:08,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=405, Unknown=0, NotChecked=0, Total=462 [2022-03-19 08:18:08,034 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:08,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:08,871 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-03-19 08:18:08,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 08:18:08,872 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-19 08:18:08,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:08,872 INFO L225 Difference]: With dead ends: 51 [2022-03-19 08:18:08,872 INFO L226 Difference]: Without dead ends: 29 [2022-03-19 08:18:08,873 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=240, Invalid=1482, Unknown=0, NotChecked=0, Total=1722 [2022-03-19 08:18:08,873 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 30 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:08,873 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 73 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:18:08,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-19 08:18:08,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-19 08:18:08,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:08,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-03-19 08:18:08,878 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2022-03-19 08:18:08,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:08,878 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-03-19 08:18:08,878 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:08,879 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-03-19 08:18:08,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-19 08:18:08,879 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:08,879 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:08,903 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:09,100 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 [2022-03-19 08:18:09,101 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:09,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:09,101 INFO L85 PathProgramCache]: Analyzing trace with hash -1642818962, now seen corresponding path program 12 times [2022-03-19 08:18:09,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:09,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1540860127] [2022-03-19 08:18:09,193 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:09,194 INFO L85 PathProgramCache]: Analyzing trace with hash 1786804911, now seen corresponding path program 1 times [2022-03-19 08:18:09,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:09,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212551228] [2022-03-19 08:18:09,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:09,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:09,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:09,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:09,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:09,418 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:09,418 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:09,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212551228] [2022-03-19 08:18:09,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212551228] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:09,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1603714721] [2022-03-19 08:18:09,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:09,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:09,419 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:09,421 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) [2022-03-19 08:18:09,422 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-19 08:18:09,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:09,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:18:09,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:09,565 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:09,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:09,763 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:09,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1603714721] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:09,763 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:09,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2022-03-19 08:18:10,025 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:10,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1540860127] [2022-03-19 08:18:10,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1540860127] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:10,025 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:10,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 08:18:10,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480522211] [2022-03-19 08:18:10,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:10,025 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 08:18:10,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:10,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 08:18:10,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:18:10,026 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 18 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 17 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:11,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:11,295 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2022-03-19 08:18:11,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 08:18:11,295 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 17 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-19 08:18:11,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:11,296 INFO L225 Difference]: With dead ends: 35 [2022-03-19 08:18:11,296 INFO L226 Difference]: Without dead ends: 30 [2022-03-19 08:18:11,296 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 46 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=236, Invalid=1246, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 08:18:11,296 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:11,297 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 76 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:18:11,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-19 08:18:11,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-19 08:18:11,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:11,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2022-03-19 08:18:11,302 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 28 [2022-03-19 08:18:11,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:11,302 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2022-03-19 08:18:11,302 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 17 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:11,302 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2022-03-19 08:18:11,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-19 08:18:11,302 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:11,302 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:11,321 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:11,505 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 [2022-03-19 08:18:11,506 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:11,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:11,506 INFO L85 PathProgramCache]: Analyzing trace with hash 646714815, now seen corresponding path program 13 times [2022-03-19 08:18:11,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:11,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [271575616] [2022-03-19 08:18:11,645 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:11,645 INFO L85 PathProgramCache]: Analyzing trace with hash 202751326, now seen corresponding path program 1 times [2022-03-19 08:18:11,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:11,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566837136] [2022-03-19 08:18:11,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:11,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:11,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:11,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:11,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:11,772 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:11,772 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:11,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566837136] [2022-03-19 08:18:11,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566837136] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:11,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496496828] [2022-03-19 08:18:11,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:11,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:11,772 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:11,773 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) [2022-03-19 08:18:11,774 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-19 08:18:11,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:11,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:18:11,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:11,892 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:11,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:11,954 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:11,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496496828] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:11,954 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:11,955 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2022-03-19 08:18:12,239 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:12,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [271575616] [2022-03-19 08:18:12,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [271575616] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:12,239 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:12,239 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 08:18:12,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19899193] [2022-03-19 08:18:12,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:12,239 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 08:18:12,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:12,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 08:18:12,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:18:12,240 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 16 states, 16 states have (on average 1.5625) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:13,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:13,071 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2022-03-19 08:18:13,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 08:18:13,072 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-19 08:18:13,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:13,072 INFO L225 Difference]: With dead ends: 52 [2022-03-19 08:18:13,072 INFO L226 Difference]: Without dead ends: 47 [2022-03-19 08:18:13,073 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=209, Invalid=721, Unknown=0, NotChecked=0, Total=930 [2022-03-19 08:18:13,073 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 43 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:13,073 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 40 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:18:13,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-19 08:18:13,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 32. [2022-03-19 08:18:13,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:13,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2022-03-19 08:18:13,080 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 29 [2022-03-19 08:18:13,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:13,080 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2022-03-19 08:18:13,080 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:13,080 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2022-03-19 08:18:13,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-19 08:18:13,081 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:13,081 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:13,099 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:13,287 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 [2022-03-19 08:18:13,287 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:13,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:13,288 INFO L85 PathProgramCache]: Analyzing trace with hash -1392182130, now seen corresponding path program 14 times [2022-03-19 08:18:13,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:13,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1573436751] [2022-03-19 08:18:13,382 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:13,382 INFO L85 PathProgramCache]: Analyzing trace with hash -481773297, now seen corresponding path program 1 times [2022-03-19 08:18:13,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:13,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851327245] [2022-03-19 08:18:13,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:13,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:13,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:13,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:13,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:13,589 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:13,590 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:13,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851327245] [2022-03-19 08:18:13,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851327245] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:13,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771853952] [2022-03-19 08:18:13,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:13,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:13,590 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:13,591 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) [2022-03-19 08:18:13,592 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-19 08:18:13,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:13,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:18:13,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:13,732 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:13,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:13,978 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:13,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771853952] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:13,978 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:13,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 21 [2022-03-19 08:18:14,310 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:14,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1573436751] [2022-03-19 08:18:14,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1573436751] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:14,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:14,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 08:18:14,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70341385] [2022-03-19 08:18:14,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:14,310 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 08:18:14,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:14,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 08:18:14,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2022-03-19 08:18:14,311 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 20 states, 20 states have (on average 1.3) internal successors, (26), 19 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) [2022-03-19 08:18:15,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:15,872 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2022-03-19 08:18:15,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-19 08:18:15,872 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.3) internal successors, (26), 19 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 30 [2022-03-19 08:18:15,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:15,872 INFO L225 Difference]: With dead ends: 57 [2022-03-19 08:18:15,873 INFO L226 Difference]: Without dead ends: 32 [2022-03-19 08:18:15,873 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 52 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=311, Invalid=2139, Unknown=0, NotChecked=0, Total=2450 [2022-03-19 08:18:15,874 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 26 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:15,874 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 78 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:18:15,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-19 08:18:15,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-19 08:18:15,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:15,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2022-03-19 08:18:15,884 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 30 [2022-03-19 08:18:15,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:15,884 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2022-03-19 08:18:15,884 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.3) internal successors, (26), 19 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) [2022-03-19 08:18:15,884 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2022-03-19 08:18:15,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-19 08:18:15,884 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:15,884 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:15,901 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:16,089 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 [2022-03-19 08:18:16,089 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:16,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:16,089 INFO L85 PathProgramCache]: Analyzing trace with hash 43269344, now seen corresponding path program 15 times [2022-03-19 08:18:16,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:16,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1695465904] [2022-03-19 08:18:16,213 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:16,213 INFO L85 PathProgramCache]: Analyzing trace with hash -844668864, now seen corresponding path program 1 times [2022-03-19 08:18:16,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:16,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628349466] [2022-03-19 08:18:16,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:16,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:16,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:16,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:16,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:16,419 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:16,419 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:16,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628349466] [2022-03-19 08:18:16,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628349466] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:16,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058073372] [2022-03-19 08:18:16,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:16,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:16,419 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:16,436 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) [2022-03-19 08:18:16,483 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-19 08:18:16,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:16,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:18:16,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:16,582 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:16,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:16,858 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:16,859 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058073372] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:16,859 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:16,859 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 21 [2022-03-19 08:18:17,408 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:17,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1695465904] [2022-03-19 08:18:17,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1695465904] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:17,408 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:17,408 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-19 08:18:17,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893889937] [2022-03-19 08:18:17,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:17,408 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-19 08:18:17,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:17,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-19 08:18:17,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=624, Unknown=0, NotChecked=0, Total=702 [2022-03-19 08:18:17,409 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:20,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:20,220 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2022-03-19 08:18:20,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-19 08:18:20,221 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-19 08:18:20,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:20,221 INFO L225 Difference]: With dead ends: 38 [2022-03-19 08:18:20,221 INFO L226 Difference]: Without dead ends: 33 [2022-03-19 08:18:20,222 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 49 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=311, Invalid=1759, Unknown=0, NotChecked=0, Total=2070 [2022-03-19 08:18:20,222 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:20,223 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 86 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-19 08:18:20,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-19 08:18:20,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-19 08:18:20,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:20,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-03-19 08:18:20,230 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2022-03-19 08:18:20,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:20,230 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-03-19 08:18:20,230 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:20,230 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-03-19 08:18:20,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 08:18:20,246 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:20,246 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:20,263 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:20,462 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 [2022-03-19 08:18:20,463 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:20,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:20,463 INFO L85 PathProgramCache]: Analyzing trace with hash 1375844749, now seen corresponding path program 16 times [2022-03-19 08:18:20,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:20,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [426415632] [2022-03-19 08:18:20,579 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:20,580 INFO L85 PathProgramCache]: Analyzing trace with hash -775382547, now seen corresponding path program 1 times [2022-03-19 08:18:20,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:20,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512370692] [2022-03-19 08:18:20,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:20,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:20,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:20,736 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:20,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:20,739 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:20,739 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:20,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512370692] [2022-03-19 08:18:20,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512370692] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:20,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100134978] [2022-03-19 08:18:20,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:20,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:20,739 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:20,744 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) [2022-03-19 08:18:20,767 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-19 08:18:20,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:20,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-19 08:18:20,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:20,894 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:20,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:20,981 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:20,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100134978] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:20,982 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:20,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2022-03-19 08:18:21,522 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:21,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [426415632] [2022-03-19 08:18:21,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [426415632] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:21,522 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:21,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 08:18:21,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096440314] [2022-03-19 08:18:21,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:21,523 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 08:18:21,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:21,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 08:18:21,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=284, Unknown=0, NotChecked=0, Total=380 [2022-03-19 08:18:21,523 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 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) [2022-03-19 08:18:22,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:22,717 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2022-03-19 08:18:22,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-19 08:18:22,718 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 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 [2022-03-19 08:18:22,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:22,718 INFO L225 Difference]: With dead ends: 58 [2022-03-19 08:18:22,718 INFO L226 Difference]: Without dead ends: 53 [2022-03-19 08:18:22,718 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=272, Invalid=918, Unknown=0, NotChecked=0, Total=1190 [2022-03-19 08:18:22,719 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 43 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:22,719 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 40 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:18:22,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-19 08:18:22,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 35. [2022-03-19 08:18:22,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:22,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2022-03-19 08:18:22,727 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 32 [2022-03-19 08:18:22,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:22,727 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2022-03-19 08:18:22,728 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 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) [2022-03-19 08:18:22,728 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2022-03-19 08:18:22,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-19 08:18:22,728 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:22,728 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:22,746 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:22,928 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 [2022-03-19 08:18:22,929 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:22,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:22,929 INFO L85 PathProgramCache]: Analyzing trace with hash -263990656, now seen corresponding path program 17 times [2022-03-19 08:18:22,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:22,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [669499777] [2022-03-19 08:18:23,021 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:23,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1885970848, now seen corresponding path program 1 times [2022-03-19 08:18:23,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:23,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767597931] [2022-03-19 08:18:23,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:23,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:23,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:23,333 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:23,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:23,336 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:23,337 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:23,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767597931] [2022-03-19 08:18:23,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767597931] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:23,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639682990] [2022-03-19 08:18:23,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:23,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:23,337 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:23,342 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) [2022-03-19 08:18:23,344 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-19 08:18:23,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:23,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-19 08:18:23,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:23,459 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:23,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:23,897 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:23,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639682990] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:23,897 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:23,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 24 [2022-03-19 08:18:24,641 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:24,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [669499777] [2022-03-19 08:18:24,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [669499777] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:24,641 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:24,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 08:18:24,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10097003] [2022-03-19 08:18:24,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:24,641 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 08:18:24,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:24,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 08:18:24,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=784, Unknown=0, NotChecked=0, Total=870 [2022-03-19 08:18:24,642 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:27,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:27,732 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2022-03-19 08:18:27,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-19 08:18:27,732 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-19 08:18:27,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:27,733 INFO L225 Difference]: With dead ends: 63 [2022-03-19 08:18:27,733 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 08:18:27,733 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=390, Invalid=2916, Unknown=0, NotChecked=0, Total=3306 [2022-03-19 08:18:27,734 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 30 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:27,734 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 93 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 447 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-19 08:18:27,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 08:18:27,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-19 08:18:27,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:27,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-03-19 08:18:27,742 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 33 [2022-03-19 08:18:27,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:27,743 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-03-19 08:18:27,743 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:27,743 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-03-19 08:18:27,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-19 08:18:27,743 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:27,744 INFO L500 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:27,768 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:27,957 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 [2022-03-19 08:18:27,957 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:27,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:27,958 INFO L85 PathProgramCache]: Analyzing trace with hash -685840210, now seen corresponding path program 18 times [2022-03-19 08:18:27,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:27,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1291327417] [2022-03-19 08:18:28,078 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:28,078 INFO L85 PathProgramCache]: Analyzing trace with hash 785671631, now seen corresponding path program 1 times [2022-03-19 08:18:28,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:28,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404625554] [2022-03-19 08:18:28,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:28,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:28,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:28,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:28,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:28,376 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:28,376 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:28,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404625554] [2022-03-19 08:18:28,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404625554] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:28,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821034333] [2022-03-19 08:18:28,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:28,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:28,376 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:28,377 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) [2022-03-19 08:18:28,380 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-19 08:18:28,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:28,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-19 08:18:28,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:28,531 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:28,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:28,941 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:28,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821034333] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:28,941 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:28,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 24 [2022-03-19 08:18:30,281 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:30,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1291327417] [2022-03-19 08:18:30,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1291327417] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:30,281 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:30,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-19 08:18:30,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065462546] [2022-03-19 08:18:30,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:30,282 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-19 08:18:30,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:30,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-19 08:18:30,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2022-03-19 08:18:30,282 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 24 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:35,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:35,446 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-03-19 08:18:35,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-19 08:18:35,446 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-19 08:18:35,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:35,447 INFO L225 Difference]: With dead ends: 41 [2022-03-19 08:18:35,447 INFO L226 Difference]: Without dead ends: 36 [2022-03-19 08:18:35,447 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=396, Invalid=2360, Unknown=0, NotChecked=0, Total=2756 [2022-03-19 08:18:35,448 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 29 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:35,448 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 96 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 346 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-19 08:18:35,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-19 08:18:35,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-03-19 08:18:35,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:35,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2022-03-19 08:18:35,455 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 34 [2022-03-19 08:18:35,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:35,456 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2022-03-19 08:18:35,456 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:35,456 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2022-03-19 08:18:35,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-19 08:18:35,456 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:35,456 INFO L500 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:35,473 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:35,656 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 [2022-03-19 08:18:35,657 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:35,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:35,657 INFO L85 PathProgramCache]: Analyzing trace with hash 248285055, now seen corresponding path program 19 times [2022-03-19 08:18:35,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:35,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [158733709] [2022-03-19 08:18:35,769 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:35,770 INFO L85 PathProgramCache]: Analyzing trace with hash 1328895550, now seen corresponding path program 1 times [2022-03-19 08:18:35,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:35,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496113334] [2022-03-19 08:18:35,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:35,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:35,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:36,003 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:36,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:36,006 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:36,006 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:36,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496113334] [2022-03-19 08:18:36,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496113334] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:36,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033359344] [2022-03-19 08:18:36,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:36,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:36,006 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:36,007 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) [2022-03-19 08:18:36,008 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-19 08:18:36,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:36,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-19 08:18:36,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:36,163 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:36,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:36,255 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:36,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033359344] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:36,255 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:36,255 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2022-03-19 08:18:37,419 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:37,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [158733709] [2022-03-19 08:18:37,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [158733709] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:37,419 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:37,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 08:18:37,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896511188] [2022-03-19 08:18:37,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:37,420 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 08:18:37,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:37,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 08:18:37,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2022-03-19 08:18:37,420 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 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) [2022-03-19 08:18:39,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:39,758 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2022-03-19 08:18:39,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-19 08:18:39,758 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 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 [2022-03-19 08:18:39,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:39,759 INFO L225 Difference]: With dead ends: 64 [2022-03-19 08:18:39,759 INFO L226 Difference]: Without dead ends: 59 [2022-03-19 08:18:39,761 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=344, Invalid=1138, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 08:18:39,762 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 42 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:39,763 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 40 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-19 08:18:39,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-19 08:18:39,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 38. [2022-03-19 08:18:39,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.121212121212121) internal successors, (37), 33 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:39,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2022-03-19 08:18:39,789 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 35 [2022-03-19 08:18:39,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:39,789 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2022-03-19 08:18:39,789 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 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) [2022-03-19 08:18:39,789 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2022-03-19 08:18:39,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-19 08:18:39,790 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:39,790 INFO L500 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:39,808 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:40,006 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 [2022-03-19 08:18:40,006 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:40,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:40,007 INFO L85 PathProgramCache]: Analyzing trace with hash -858602802, now seen corresponding path program 20 times [2022-03-19 08:18:40,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:40,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1884269458] [2022-03-19 08:18:40,135 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:40,135 INFO L85 PathProgramCache]: Analyzing trace with hash 636099631, now seen corresponding path program 1 times [2022-03-19 08:18:40,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:40,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015920070] [2022-03-19 08:18:40,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:40,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:40,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:40,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:40,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:40,537 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:40,537 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:40,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015920070] [2022-03-19 08:18:40,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015920070] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:40,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112585364] [2022-03-19 08:18:40,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:40,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:40,537 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:40,538 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) [2022-03-19 08:18:40,539 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-19 08:18:40,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:40,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-19 08:18:40,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:40,668 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:40,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:41,123 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:41,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112585364] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:41,123 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:41,123 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 27 [2022-03-19 08:18:42,881 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:42,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1884269458] [2022-03-19 08:18:42,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1884269458] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:42,882 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:42,882 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:18:42,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946847758] [2022-03-19 08:18:42,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:42,882 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:18:42,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:42,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:18:42,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1020, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 08:18:42,883 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 26 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 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) [2022-03-19 08:18:49,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:49,333 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2022-03-19 08:18:49,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-19 08:18:49,333 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 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 36 [2022-03-19 08:18:49,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:49,334 INFO L225 Difference]: With dead ends: 69 [2022-03-19 08:18:49,334 INFO L226 Difference]: Without dead ends: 38 [2022-03-19 08:18:49,335 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 682 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=477, Invalid=3813, Unknown=0, NotChecked=0, Total=4290 [2022-03-19 08:18:49,337 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 26 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:49,337 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 113 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-19 08:18:49,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-19 08:18:49,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-19 08:18:49,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:18:49,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-03-19 08:18:49,346 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 36 [2022-03-19 08:18:49,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:49,346 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-03-19 08:18:49,346 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 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) [2022-03-19 08:18:49,346 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-03-19 08:18:49,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 08:18:49,346 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:49,346 INFO L500 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:49,363 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-19 08:18:49,561 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 [2022-03-19 08:18:49,561 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:49,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:49,561 INFO L85 PathProgramCache]: Analyzing trace with hash 843169312, now seen corresponding path program 21 times [2022-03-19 08:18:49,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:49,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [404908835] [2022-03-19 08:18:49,640 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:18:49,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1499769632, now seen corresponding path program 1 times [2022-03-19 08:18:49,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:49,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560321323] [2022-03-19 08:18:49,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:49,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:49,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:50,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:50,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:50,066 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:50,066 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:50,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560321323] [2022-03-19 08:18:50,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560321323] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:50,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711684206] [2022-03-19 08:18:50,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:50,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:50,066 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:50,072 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) [2022-03-19 08:18:50,074 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-19 08:18:50,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:50,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-19 08:18:50,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:50,292 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:50,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:50,783 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:50,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711684206] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:50,783 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:50,783 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 27 [2022-03-19 08:18:54,126 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:54,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [404908835] [2022-03-19 08:18:54,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [404908835] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:54,127 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:54,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-19 08:18:54,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260008070] [2022-03-19 08:18:54,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:54,127 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-19 08:18:54,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:54,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-19 08:18:54,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1079, Unknown=0, NotChecked=0, Total=1190 [2022-03-19 08:18:54,128 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 27 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 26 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:19:07,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:19:07,555 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2022-03-19 08:19:07,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-19 08:19:07,555 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 26 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-19 08:19:07,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:19:07,556 INFO L225 Difference]: With dead ends: 44 [2022-03-19 08:19:07,556 INFO L226 Difference]: Without dead ends: 39 [2022-03-19 08:19:07,557 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 54 SyntacticMatches, 7 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=491, Invalid=3049, Unknown=0, NotChecked=0, Total=3540 [2022-03-19 08:19:07,557 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 29 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:19:07,557 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 101 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-03-19 08:19:07,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-19 08:19:07,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-19 08:19:07,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:19:07,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2022-03-19 08:19:07,566 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 37 [2022-03-19 08:19:07,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:19:07,566 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2022-03-19 08:19:07,566 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 26 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:19:07,566 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2022-03-19 08:19:07,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-19 08:19:07,566 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:19:07,566 INFO L500 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:19:07,584 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-19 08:19:07,783 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 [2022-03-19 08:19:07,785 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:19:07,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:19:07,785 INFO L85 PathProgramCache]: Analyzing trace with hash 402939981, now seen corresponding path program 22 times [2022-03-19 08:19:07,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:19:07,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [208312308] [2022-03-19 08:19:07,860 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:19:07,861 INFO L85 PathProgramCache]: Analyzing trace with hash -710751475, now seen corresponding path program 1 times [2022-03-19 08:19:07,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:19:07,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110488768] [2022-03-19 08:19:07,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:19:07,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:19:07,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:08,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:19:08,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:08,264 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:08,264 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:19:08,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110488768] [2022-03-19 08:19:08,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110488768] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:19:08,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175949294] [2022-03-19 08:19:08,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:19:08,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:19:08,265 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:19:08,280 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) [2022-03-19 08:19:08,290 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-19 08:19:08,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:08,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 08:19:08,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:19:08,484 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:08,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:19:08,612 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:08,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175949294] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:19:08,613 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:19:08,613 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2022-03-19 08:19:11,965 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:19:11,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [208312308] [2022-03-19 08:19:11,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [208312308] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:19:11,966 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:19:11,966 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-19 08:19:11,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068710528] [2022-03-19 08:19:11,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:19:11,966 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-19 08:19:11,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:19:11,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-19 08:19:11,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=405, Unknown=0, NotChecked=0, Total=552 [2022-03-19 08:19:11,967 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 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) [2022-03-19 08:19:16,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:19:16,036 INFO L93 Difference]: Finished difference Result 70 states and 81 transitions. [2022-03-19 08:19:16,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-19 08:19:16,037 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 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 [2022-03-19 08:19:16,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:19:16,038 INFO L225 Difference]: With dead ends: 70 [2022-03-19 08:19:16,038 INFO L226 Difference]: Without dead ends: 65 [2022-03-19 08:19:16,038 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=425, Invalid=1381, Unknown=0, NotChecked=0, Total=1806 [2022-03-19 08:19:16,038 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 46 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:19:16,038 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 50 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 366 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-19 08:19:16,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-19 08:19:16,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 41. [2022-03-19 08:19:16,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:19:16,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2022-03-19 08:19:16,050 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 38 [2022-03-19 08:19:16,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:19:16,050 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2022-03-19 08:19:16,050 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 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) [2022-03-19 08:19:16,050 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2022-03-19 08:19:16,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-19 08:19:16,050 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:19:16,050 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:19:16,068 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-03-19 08:19:16,252 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 [2022-03-19 08:19:16,253 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:19:16,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:19:16,258 INFO L85 PathProgramCache]: Analyzing trace with hash -359267392, now seen corresponding path program 23 times [2022-03-19 08:19:16,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:19:16,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1276134825] [2022-03-19 08:19:16,381 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:19:16,382 INFO L85 PathProgramCache]: Analyzing trace with hash -321375936, now seen corresponding path program 1 times [2022-03-19 08:19:16,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:19:16,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231516145] [2022-03-19 08:19:16,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:19:16,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:19:16,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:16,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:19:16,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:16,954 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:19:16,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231516145] [2022-03-19 08:19:16,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231516145] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:19:16,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675344259] [2022-03-19 08:19:16,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:19:16,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:19:16,955 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:19:16,956 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) [2022-03-19 08:19:16,957 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-19 08:19:16,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:16,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 08:19:16,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:19:17,115 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:17,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:19:17,789 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:17,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675344259] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:19:17,790 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:19:17,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 30 [2022-03-19 08:19:23,274 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:19:23,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1276134825] [2022-03-19 08:19:23,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1276134825] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:19:23,274 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:19:23,275 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-19 08:19:23,275 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978891734] [2022-03-19 08:19:23,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:19:23,275 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-19 08:19:23,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:19:23,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-19 08:19:23,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1287, Unknown=0, NotChecked=0, Total=1406 [2022-03-19 08:19:23,276 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 28 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) [2022-03-19 08:19:37,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:19:37,624 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2022-03-19 08:19:37,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-19 08:19:37,624 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 28 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 39 [2022-03-19 08:19:37,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:19:37,625 INFO L225 Difference]: With dead ends: 75 [2022-03-19 08:19:37,625 INFO L226 Difference]: Without dead ends: 41 [2022-03-19 08:19:37,626 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 61 SyntacticMatches, 5 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 875 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=572, Invalid=4830, Unknown=0, NotChecked=0, Total=5402 [2022-03-19 08:19:37,626 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-03-19 08:19:37,626 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 118 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-03-19 08:19:37,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-19 08:19:37,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-19 08:19:37,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:19:37,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-03-19 08:19:37,640 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 39 [2022-03-19 08:19:37,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:19:37,640 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-03-19 08:19:37,640 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 28 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) [2022-03-19 08:19:37,640 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-03-19 08:19:37,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-19 08:19:37,641 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:19:37,641 INFO L500 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:19:37,657 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-03-19 08:19:37,857 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 [2022-03-19 08:19:37,857 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:19:37,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:19:37,858 INFO L85 PathProgramCache]: Analyzing trace with hash -416379154, now seen corresponding path program 24 times [2022-03-19 08:19:37,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:19:37,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [820072356] [2022-03-19 08:19:38,012 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:19:38,013 INFO L85 PathProgramCache]: Analyzing trace with hash 878643439, now seen corresponding path program 1 times [2022-03-19 08:19:38,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:19:38,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684539615] [2022-03-19 08:19:38,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:19:38,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:19:38,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:38,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:19:38,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:38,612 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:38,612 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:19:38,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684539615] [2022-03-19 08:19:38,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684539615] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:19:38,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768321774] [2022-03-19 08:19:38,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:19:38,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:19:38,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:19:38,614 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) [2022-03-19 08:19:38,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-19 08:19:38,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:19:38,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 08:19:38,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:19:39,005 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:39,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:19:40,009 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:19:40,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768321774] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:19:40,009 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:19:40,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 30 [2022-03-19 08:19:47,260 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:19:47,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [820072356] [2022-03-19 08:19:47,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [820072356] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:19:47,261 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:19:47,261 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-19 08:19:47,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248756513] [2022-03-19 08:19:47,261 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:19:47,261 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-19 08:19:47,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:19:47,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-19 08:19:47,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1353, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 08:19:47,262 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:12,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:12,106 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2022-03-19 08:20:12,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-19 08:20:12,107 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2022-03-19 08:20:12,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:12,107 INFO L225 Difference]: With dead ends: 47 [2022-03-19 08:20:12,107 INFO L226 Difference]: Without dead ends: 42 [2022-03-19 08:20:12,108 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 27.4s TimeCoverageRelationStatistics Valid=596, Invalid=3826, Unknown=0, NotChecked=0, Total=4422 [2022-03-19 08:20:12,109 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 33 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:12,109 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 116 Invalid, 631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2022-03-19 08:20:12,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-19 08:20:12,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-03-19 08:20:12,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:12,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-03-19 08:20:12,136 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 40 [2022-03-19 08:20:12,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:12,136 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-03-19 08:20:12,137 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:12,137 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-03-19 08:20:12,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 08:20:12,137 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:12,137 INFO L500 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:12,163 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:12,343 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 [2022-03-19 08:20:12,344 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:12,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:12,344 INFO L85 PathProgramCache]: Analyzing trace with hash 11643199, now seen corresponding path program 25 times [2022-03-19 08:20:12,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:12,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [541961029] [2022-03-19 08:20:12,448 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:12,448 INFO L85 PathProgramCache]: Analyzing trace with hash -807061730, now seen corresponding path program 1 times [2022-03-19 08:20:12,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:12,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572354306] [2022-03-19 08:20:12,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:12,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:12,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:13,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:13,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:13,008 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:13,008 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:13,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572354306] [2022-03-19 08:20:13,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572354306] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:13,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129361238] [2022-03-19 08:20:13,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:13,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:13,009 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:13,010 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) [2022-03-19 08:20:13,011 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-19 08:20:13,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:13,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-19 08:20:13,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:13,282 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:13,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:13,439 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:13,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129361238] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:13,439 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:13,439 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2022-03-19 08:20:20,173 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:20,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [541961029] [2022-03-19 08:20:20,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [541961029] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:20,174 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:20,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-19 08:20:20,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092123058] [2022-03-19 08:20:20,174 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:20,174 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-19 08:20:20,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:20,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-19 08:20:20,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=473, Unknown=0, NotChecked=0, Total=650 [2022-03-19 08:20:20,176 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:29,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:29,215 INFO L93 Difference]: Finished difference Result 76 states and 88 transitions. [2022-03-19 08:20:29,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-19 08:20:29,215 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (3), 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 [2022-03-19 08:20:29,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:29,215 INFO L225 Difference]: With dead ends: 76 [2022-03-19 08:20:29,215 INFO L226 Difference]: Without dead ends: 71 [2022-03-19 08:20:29,216 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=515, Invalid=1647, Unknown=0, NotChecked=0, Total=2162 [2022-03-19 08:20:29,216 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 52 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:29,216 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 45 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-03-19 08:20:29,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-19 08:20:29,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 44. [2022-03-19 08:20:29,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:29,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2022-03-19 08:20:29,232 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 41 [2022-03-19 08:20:29,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:29,232 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2022-03-19 08:20:29,232 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:29,232 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2022-03-19 08:20:29,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-19 08:20:29,232 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:29,233 INFO L500 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:29,251 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:29,446 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 [2022-03-19 08:20:29,446 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:29,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:29,447 INFO L85 PathProgramCache]: Analyzing trace with hash 395434254, now seen corresponding path program 26 times [2022-03-19 08:20:29,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:29,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1026588237] [2022-03-19 08:20:29,572 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:29,572 INFO L85 PathProgramCache]: Analyzing trace with hash -2095827121, now seen corresponding path program 1 times [2022-03-19 08:20:29,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:29,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775669596] [2022-03-19 08:20:29,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:29,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:29,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:30,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:30,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:30,497 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:30,497 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:30,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775669596] [2022-03-19 08:20:30,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775669596] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:30,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702967735] [2022-03-19 08:20:30,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:30,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:30,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:30,498 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) [2022-03-19 08:20:30,500 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-19 08:20:30,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:30,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-19 08:20:30,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:30,679 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:30,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:31,894 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:31,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702967735] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:31,894 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:31,894 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 33 [2022-03-19 08:20:43,422 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:43,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1026588237] [2022-03-19 08:20:43,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1026588237] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:43,423 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:43,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-19 08:20:43,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506853801] [2022-03-19 08:20:43,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:43,423 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-19 08:20:43,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:43,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-19 08:20:43,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1585, Unknown=0, NotChecked=0, Total=1722 [2022-03-19 08:20:43,424 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 32 states, 32 states have (on average 1.1875) internal successors, (38), 31 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) [2022-03-19 08:21:10,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:10,509 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2022-03-19 08:21:10,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-19 08:21:10,510 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 31 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 42 [2022-03-19 08:21:10,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:10,510 INFO L225 Difference]: With dead ends: 81 [2022-03-19 08:21:10,510 INFO L226 Difference]: Without dead ends: 44 [2022-03-19 08:21:10,511 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1092 ImplicationChecksByTransitivity, 36.6s TimeCoverageRelationStatistics Valid=675, Invalid=5967, Unknown=0, NotChecked=0, Total=6642 [2022-03-19 08:21:10,512 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:10,512 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 128 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 848 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-03-19 08:21:10,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-19 08:21:10,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-19 08:21:10,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:10,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2022-03-19 08:21:10,526 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 42 [2022-03-19 08:21:10,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:10,526 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2022-03-19 08:21:10,526 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 31 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) [2022-03-19 08:21:10,526 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2022-03-19 08:21:10,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-19 08:21:10,526 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:10,526 INFO L500 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:10,542 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-19 08:21:10,743 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 [2022-03-19 08:21:10,743 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:10,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:10,743 INFO L85 PathProgramCache]: Analyzing trace with hash -1246089376, now seen corresponding path program 27 times [2022-03-19 08:21:10,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:10,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [724527749] [2022-03-19 08:21:10,864 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:21:10,865 INFO L85 PathProgramCache]: Analyzing trace with hash 173522432, now seen corresponding path program 1 times [2022-03-19 08:21:10,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:10,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317694418] [2022-03-19 08:21:10,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:10,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:10,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:11,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:11,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:11,780 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:11,780 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:11,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317694418] [2022-03-19 08:21:11,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317694418] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:11,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805233253] [2022-03-19 08:21:11,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:11,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:11,780 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:11,781 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) [2022-03-19 08:21:11,782 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-19 08:21:11,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:11,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-19 08:21:11,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:12,061 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:12,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:13,180 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:13,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805233253] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:13,181 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:13,181 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 33 [2022-03-19 08:21:29,579 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:29,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [724527749] [2022-03-19 08:21:29,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [724527749] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:29,579 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:29,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-19 08:21:29,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374166444] [2022-03-19 08:21:29,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:29,579 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-19 08:21:29,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:29,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-19 08:21:29,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1658, Unknown=0, NotChecked=0, Total=1806 [2022-03-19 08:21:29,580 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 32 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:15,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:15,874 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2022-03-19 08:22:15,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-19 08:22:15,874 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 32 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-19 08:22:15,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:15,875 INFO L225 Difference]: With dead ends: 50 [2022-03-19 08:22:15,875 INFO L226 Difference]: Without dead ends: 45 [2022-03-19 08:22:15,875 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 60 SyntacticMatches, 7 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 54.3s TimeCoverageRelationStatistics Valid=711, Invalid=4691, Unknown=0, NotChecked=0, Total=5402 [2022-03-19 08:22:15,875 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 37 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 736 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:15,876 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 126 Invalid, 736 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 575 Invalid, 0 Unknown, 0 Unchecked, 10.2s Time] [2022-03-19 08:22:15,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-19 08:22:15,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-19 08:22:15,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:15,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-03-19 08:22:15,889 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 43 [2022-03-19 08:22:15,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:15,889 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-03-19 08:22:15,889 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 32 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:15,889 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-03-19 08:22:15,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-19 08:22:15,889 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:15,889 INFO L500 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:15,908 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:16,098 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 [2022-03-19 08:22:16,099 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:16,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:16,100 INFO L85 PathProgramCache]: Analyzing trace with hash 60430093, now seen corresponding path program 28 times [2022-03-19 08:22:16,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:16,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1283368929] [2022-03-19 08:22:16,222 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:16,223 INFO L85 PathProgramCache]: Analyzing trace with hash 1995453485, now seen corresponding path program 1 times [2022-03-19 08:22:16,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:16,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029607896] [2022-03-19 08:22:16,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:16,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:16,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:17,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:17,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:17,034 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:17,034 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:17,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029607896] [2022-03-19 08:22:17,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029607896] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:17,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719376584] [2022-03-19 08:22:17,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:17,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:17,034 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:17,035 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) [2022-03-19 08:22:17,036 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-19 08:22:17,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:17,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 08:22:17,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:17,306 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:17,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:17,486 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:17,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [719376584] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:17,486 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:17,486 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2022-03-19 08:22:30,731 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:30,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1283368929] [2022-03-19 08:22:30,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1283368929] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:30,732 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:30,732 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:22:30,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992282755] [2022-03-19 08:22:30,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:30,732 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:22:30,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:30,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:22:30,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=546, Unknown=0, NotChecked=0, Total=756 [2022-03-19 08:22:30,733 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:47,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:47,649 INFO L93 Difference]: Finished difference Result 82 states and 95 transitions. [2022-03-19 08:22:47,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 08:22:47,649 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 2 states have call successors, (3), 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 [2022-03-19 08:22:47,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:47,650 INFO L225 Difference]: With dead ends: 82 [2022-03-19 08:22:47,650 INFO L226 Difference]: Without dead ends: 77 [2022-03-19 08:22:47,650 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=614, Invalid=1936, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 08:22:47,651 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 57 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:47,651 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 35 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-03-19 08:22:47,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-19 08:22:47,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 47. [2022-03-19 08:22:47,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 42 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:47,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2022-03-19 08:22:47,669 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 44 [2022-03-19 08:22:47,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:47,669 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2022-03-19 08:22:47,669 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:47,669 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2022-03-19 08:22:47,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-19 08:22:47,670 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:47,670 INFO L500 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:47,704 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:47,885 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 [2022-03-19 08:22:47,885 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:47,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:47,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1907827968, now seen corresponding path program 29 times [2022-03-19 08:22:47,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:47,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1087212505] [2022-03-19 08:22:48,010 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:48,010 INFO L85 PathProgramCache]: Analyzing trace with hash -1122120672, now seen corresponding path program 1 times [2022-03-19 08:22:48,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:48,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350722348] [2022-03-19 08:22:48,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:48,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:48,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:49,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,633 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:49,633 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:49,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350722348] [2022-03-19 08:22:49,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350722348] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:49,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569621874] [2022-03-19 08:22:49,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:49,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:49,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:49,635 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) [2022-03-19 08:22:49,636 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-19 08:22:49,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 08:22:49,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:49,851 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:49,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:51,837 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:51,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569621874] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:51,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:51,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 36 [2022-03-19 08:23:13,638 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:13,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1087212505] [2022-03-19 08:23:13,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1087212505] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:13,639 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:13,639 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-19 08:23:13,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348656218] [2022-03-19 08:23:13,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:13,639 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-19 08:23:13,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:13,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-19 08:23:13,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1914, Unknown=0, NotChecked=0, Total=2070 [2022-03-19 08:23:13,640 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 34 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) [2022-03-19 08:24:12,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:12,615 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2022-03-19 08:24:12,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-19 08:24:12,615 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 34 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 45 [2022-03-19 08:24:12,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:12,616 INFO L225 Difference]: With dead ends: 87 [2022-03-19 08:24:12,616 INFO L226 Difference]: Without dead ends: 47 [2022-03-19 08:24:12,616 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 68 SyntacticMatches, 4 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1333 ImplicationChecksByTransitivity, 72.7s TimeCoverageRelationStatistics Valid=786, Invalid=7224, Unknown=0, NotChecked=0, Total=8010 [2022-03-19 08:24:12,617 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 30 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 988 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 1097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 988 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:12,617 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 138 Invalid, 1097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 988 Invalid, 0 Unknown, 0 Unchecked, 11.3s Time] [2022-03-19 08:24:12,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-19 08:24:12,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-19 08:24:12,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:12,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-03-19 08:24:12,632 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 45 [2022-03-19 08:24:12,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:12,632 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-03-19 08:24:12,632 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 34 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) [2022-03-19 08:24:12,632 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-03-19 08:24:12,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-19 08:24:12,633 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:12,633 INFO L500 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:12,651 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-03-19 08:24:12,836 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 [2022-03-19 08:24:12,837 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:12,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:12,837 INFO L85 PathProgramCache]: Analyzing trace with hash -154434258, now seen corresponding path program 30 times [2022-03-19 08:24:12,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:12,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1096473382] [2022-03-19 08:24:12,952 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:24:12,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1040344079, now seen corresponding path program 1 times [2022-03-19 08:24:12,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:12,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440296413] [2022-03-19 08:24:12,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:12,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:12,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:14,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:14,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:14,986 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:14,986 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:14,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440296413] [2022-03-19 08:24:14,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440296413] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:14,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702014793] [2022-03-19 08:24:14,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:14,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:14,987 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:14,988 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) [2022-03-19 08:24:14,989 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-19 08:24:15,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:15,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 08:24:15,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:15,428 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:15,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:17,960 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:17,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [702014793] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:17,961 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:17,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 36 [2022-03-19 08:24:49,093 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:49,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1096473382] [2022-03-19 08:24:49,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1096473382] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:49,093 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:49,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-19 08:24:49,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690241627] [2022-03-19 08:24:49,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:49,093 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-19 08:24:49,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:49,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-19 08:24:49,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1994, Unknown=0, NotChecked=0, Total=2162 [2022-03-19 08:24:49,094 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 36 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 35 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:26:15,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:26:15,266 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2022-03-19 08:26:15,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-19 08:26:15,270 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 35 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-03-19 08:26:15,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:26:15,271 INFO L225 Difference]: With dead ends: 53 [2022-03-19 08:26:15,271 INFO L226 Difference]: Without dead ends: 48 [2022-03-19 08:26:15,272 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 63 SyntacticMatches, 7 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 102.6s TimeCoverageRelationStatistics Valid=836, Invalid=5643, Unknown=1, NotChecked=0, Total=6480 [2022-03-19 08:26:15,272 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 35 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 694 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:26:15,272 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 146 Invalid, 880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 694 Invalid, 0 Unknown, 0 Unchecked, 18.9s Time] [2022-03-19 08:26:15,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-19 08:26:15,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-03-19 08:26:15,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:26:15,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2022-03-19 08:26:15,295 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 46 [2022-03-19 08:26:15,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:26:15,296 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2022-03-19 08:26:15,296 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 35 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:26:15,296 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2022-03-19 08:26:15,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-19 08:26:15,296 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:26:15,296 INFO L500 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:26:15,312 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-19 08:26:15,512 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 [2022-03-19 08:26:15,512 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:26:15,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:26:15,513 INFO L85 PathProgramCache]: Analyzing trace with hash -457999617, now seen corresponding path program 31 times [2022-03-19 08:26:15,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:26:15,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1361879548] [2022-03-19 08:26:15,648 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:26:15,648 INFO L85 PathProgramCache]: Analyzing trace with hash -1350344706, now seen corresponding path program 1 times [2022-03-19 08:26:15,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:26:15,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68672239] [2022-03-19 08:26:15,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:26:15,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:26:15,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:16,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:26:16,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:16,896 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:26:16,896 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:26:16,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68672239] [2022-03-19 08:26:16,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68672239] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:26:16,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730640294] [2022-03-19 08:26:16,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:26:16,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:26:16,897 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:26:16,898 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) [2022-03-19 08:26:16,899 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-19 08:26:16,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:16,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-19 08:26:16,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:26:17,216 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:26:17,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:26:17,493 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:26:17,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730640294] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:26:17,493 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:26:17,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2022-03-19 08:26:38,783 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:26:38,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1361879548] [2022-03-19 08:26:38,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1361879548] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:26:38,783 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:26:38,783 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-19 08:26:38,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806736047] [2022-03-19 08:26:38,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:26:38,783 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-19 08:26:38,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:26:38,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-19 08:26:38,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=624, Unknown=0, NotChecked=0, Total=870 [2022-03-19 08:26:38,784 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:27:11,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:27:11,259 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2022-03-19 08:27:11,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-19 08:27:11,259 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 2 states have call successors, (3), 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 [2022-03-19 08:27:11,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:27:11,260 INFO L225 Difference]: With dead ends: 88 [2022-03-19 08:27:11,260 INFO L226 Difference]: Without dead ends: 83 [2022-03-19 08:27:11,260 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 84 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 47.5s TimeCoverageRelationStatistics Valid=722, Invalid=2248, Unknown=0, NotChecked=0, Total=2970 [2022-03-19 08:27:11,260 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 74 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:27:11,261 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 40 Invalid, 708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 541 Invalid, 0 Unknown, 0 Unchecked, 7.3s Time] [2022-03-19 08:27:11,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-03-19 08:27:11,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 50. [2022-03-19 08:27:11,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:27:11,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2022-03-19 08:27:11,285 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 47 [2022-03-19 08:27:11,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:27:11,286 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2022-03-19 08:27:11,286 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:27:11,286 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2022-03-19 08:27:11,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-19 08:27:11,286 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:27:11,286 INFO L500 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:27:11,305 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-03-19 08:27:11,499 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 [2022-03-19 08:27:11,500 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:27:11,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:27:11,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1278591154, now seen corresponding path program 32 times [2022-03-19 08:27:11,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:27:11,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [84135980] [2022-03-19 08:27:11,629 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:27:11,629 INFO L85 PathProgramCache]: Analyzing trace with hash 2099841647, now seen corresponding path program 1 times [2022-03-19 08:27:11,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:27:11,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701551485] [2022-03-19 08:27:11,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:27:11,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:27:11,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:27:15,435 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:27:15,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:27:15,442 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:27:15,442 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:27:15,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701551485] [2022-03-19 08:27:15,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701551485] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:27:15,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475126414] [2022-03-19 08:27:15,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:27:15,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:27:15,443 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:27:15,444 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) [2022-03-19 08:27:15,445 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-19 08:27:15,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:27:15,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-19 08:27:15,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:27:15,765 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:27:15,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:27:19,093 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:27:19,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475126414] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:27:19,093 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:27:19,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 39 [2022-03-19 08:28:01,552 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:28:01,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [84135980] [2022-03-19 08:28:01,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [84135980] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:28:01,565 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:28:01,565 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-19 08:28:01,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774883564] [2022-03-19 08:28:01,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:28:01,565 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-19 08:28:01,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:28:01,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-19 08:28:01,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2274, Unknown=0, NotChecked=0, Total=2450 [2022-03-19 08:28:01,566 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 38 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 37 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) [2022-03-19 08:29:07,102 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 08:29:38,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:29:38,879 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2022-03-19 08:29:38,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-19 08:29:38,881 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 37 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 48 [2022-03-19 08:29:38,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:29:38,881 INFO L225 Difference]: With dead ends: 93 [2022-03-19 08:29:38,881 INFO L226 Difference]: Without dead ends: 50 [2022-03-19 08:29:38,882 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1598 ImplicationChecksByTransitivity, 127.3s TimeCoverageRelationStatistics Valid=905, Invalid=8601, Unknown=0, NotChecked=0, Total=9506 [2022-03-19 08:29:38,882 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 1194 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 1319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 1194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:29:38,883 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 153 Invalid, 1319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 1194 Invalid, 0 Unknown, 0 Unchecked, 19.0s Time] [2022-03-19 08:29:38,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-19 08:29:38,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-03-19 08:29:38,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:38,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2022-03-19 08:29:38,904 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 48 [2022-03-19 08:29:38,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:29:38,904 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2022-03-19 08:29:38,904 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 37 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) [2022-03-19 08:29:38,904 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2022-03-19 08:29:38,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-19 08:29:38,905 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:29:38,905 INFO L500 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:29:38,921 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-19 08:29:39,119 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 [2022-03-19 08:29:39,119 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:29:39,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:29:39,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1691717792, now seen corresponding path program 33 times [2022-03-19 08:29:39,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:29:39,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1571083530] [2022-03-19 08:29:39,240 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:29:39,240 INFO L85 PathProgramCache]: Analyzing trace with hash 668899552, now seen corresponding path program 1 times [2022-03-19 08:29:39,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:29:39,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51945089] [2022-03-19 08:29:39,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:29:39,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:29:39,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:41,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:29:41,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:41,570 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:29:41,570 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:29:41,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51945089] [2022-03-19 08:29:41,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51945089] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:29:41,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179390549] [2022-03-19 08:29:41,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:29:41,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:29:41,571 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:29:41,572 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) [2022-03-19 08:29:41,572 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-19 08:29:41,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:41,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-19 08:29:41,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:29:42,059 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:29:42,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:29:44,991 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:29:44,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179390549] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:29:44,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:29:44,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 39 [2022-03-19 08:30:43,631 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:30:43,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1571083530] [2022-03-19 08:30:43,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1571083530] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:30:43,631 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:30:43,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-19 08:30:43,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257150889] [2022-03-19 08:30:43,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:30:43,632 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-19 08:30:43,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:30:43,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-19 08:30:43,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2361, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 08:30:43,632 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 39 states, 39 states have (on average 1.1538461538461537) internal successors, (45), 38 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:25,028 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 08:31:58,377 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers []