/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-de62.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:50:52,523 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:50:52,525 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:50:52,566 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:50:52,613 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:50:52,614 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:50:52,615 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:50:52,616 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:50:52,626 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:50:52,627 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:50:52,629 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:50:52,629 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:50:52,629 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:50:52,630 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:50:52,630 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:50:52,630 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:50:52,630 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:50:52,631 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:50:52,631 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:50:52,631 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:50:52,631 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:50:52,631 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:50:52,631 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:50:52,631 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:50:52,632 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:50:52,632 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:50:52,632 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:50:52,632 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:50:52,632 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:50:52,632 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:50:52,632 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:50:52,877 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:50:52,896 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:50:52,898 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:50:52,899 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:50:52,900 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:50:52,901 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de62.c [2022-03-20 18:50:52,955 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/229fefff4/75ffdef7609b4fdb8eee25c73a5d8d36/FLAG216fd8f13 [2022-03-20 18:50:53,290 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:50:53,290 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de62.c [2022-03-20 18:50:53,294 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/229fefff4/75ffdef7609b4fdb8eee25c73a5d8d36/FLAG216fd8f13 [2022-03-20 18:50:53,714 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/229fefff4/75ffdef7609b4fdb8eee25c73a5d8d36 [2022-03-20 18:50:53,716 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:50:53,717 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:50:53,719 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:50:53,719 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:50:53,722 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:50:53,723 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,724 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@499fd035 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53, skipping insertion in model container [2022-03-20 18:50:53,724 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,729 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:50:53,742 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:50:53,858 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-de62.c[368,381] [2022-03-20 18:50:53,869 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:50:53,875 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:50:53,882 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-de62.c[368,381] [2022-03-20 18:50:53,886 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:50:53,894 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:50:53,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53 WrapperNode [2022-03-20 18:50:53,894 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:50:53,895 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:50:53,895 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:50:53,895 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:50:53,907 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,908 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,912 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,912 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,915 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,919 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,919 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,921 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:50:53,922 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:50:53,922 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:50:53,922 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:50:53,923 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (1/1) ... [2022-03-20 18:50:53,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:50:53,948 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:50:53,958 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 18:50:53,983 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 18:50:53,996 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:50:53,996 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:50:53,996 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:50:53,996 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:50:53,997 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:50:53,997 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:50:53,997 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:50:53,997 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:50:53,997 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:50:53,997 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 18:50:53,997 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:50:53,997 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:50:53,997 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:50:53,998 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:50:53,998 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:50:53,998 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:50:53,998 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:50:53,998 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:50:54,048 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:50:54,050 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:50:54,140 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:50:54,145 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:50:54,145 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2022-03-20 18:50:54,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:50:54 BoogieIcfgContainer [2022-03-20 18:50:54,147 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:50:54,148 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:50:54,148 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:50:54,162 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:50:54,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:50:53" (1/3) ... [2022-03-20 18:50:54,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a888776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:50:54, skipping insertion in model container [2022-03-20 18:50:54,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:50:53" (2/3) ... [2022-03-20 18:50:54,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a888776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:50:54, skipping insertion in model container [2022-03-20 18:50:54,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:50:54" (3/3) ... [2022-03-20 18:50:54,164 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de62.c [2022-03-20 18:50:54,168 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:50:54,168 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:50:54,206 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:50:54,215 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 18:50:54,216 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:50:54,234 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 18:50:54,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:50:54,250 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:54,250 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:54,251 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:54,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:54,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1370249117, now seen corresponding path program 1 times [2022-03-20 18:50:54,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:54,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [103260201] [2022-03-20 18:50:54,280 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:50:54,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1370249117, now seen corresponding path program 2 times [2022-03-20 18:50:54,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:54,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368269635] [2022-03-20 18:50:54,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:54,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:54,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:54,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:54,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:54,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:54,427 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:54,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368269635] [2022-03-20 18:50:54,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368269635] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:54,428 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:54,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:50:54,430 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:54,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [103260201] [2022-03-20 18:50:54,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [103260201] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:54,431 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:54,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:50:54,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072301603] [2022-03-20 18:50:54,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:54,435 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 18:50:54,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:54,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 18:50:54,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:50:54,457 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:54,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:54,516 INFO L93 Difference]: Finished difference Result 43 states and 66 transitions. [2022-03-20 18:50:54,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 18:50:54,518 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:50:54,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:54,522 INFO L225 Difference]: With dead ends: 43 [2022-03-20 18:50:54,523 INFO L226 Difference]: Without dead ends: 18 [2022-03-20 18:50:54,525 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:50:54,527 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 21 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:54,528 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 32 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:50:54,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-20 18:50:54,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-20 18:50:54,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 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) [2022-03-20 18:50:54,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2022-03-20 18:50:54,570 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 17 [2022-03-20 18:50:54,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:54,570 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2022-03-20 18:50:54,570 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:54,571 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2022-03-20 18:50:54,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:50:54,571 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:54,571 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:54,572 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:50:54,572 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:54,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:54,573 INFO L85 PathProgramCache]: Analyzing trace with hash 2115201689, now seen corresponding path program 1 times [2022-03-20 18:50:54,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:54,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1531154425] [2022-03-20 18:50:54,574 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:50:54,574 INFO L85 PathProgramCache]: Analyzing trace with hash 2115201689, now seen corresponding path program 2 times [2022-03-20 18:50:54,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:54,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146305796] [2022-03-20 18:50:54,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:54,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:54,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:54,707 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:54,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:54,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:54,716 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:54,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146305796] [2022-03-20 18:50:54,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146305796] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:54,717 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:54,717 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:50:54,717 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:54,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1531154425] [2022-03-20 18:50:54,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1531154425] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:54,718 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:54,718 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:50:54,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106815651] [2022-03-20 18:50:54,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:54,719 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:50:54,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:54,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:50:54,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:50:54,720 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:54,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:54,843 INFO L93 Difference]: Finished difference Result 34 states and 46 transitions. [2022-03-20 18:50:54,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:50:54,843 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:50:54,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:54,845 INFO L225 Difference]: With dead ends: 34 [2022-03-20 18:50:54,846 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 18:50:54,846 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:50:54,851 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 26 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:54,852 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 35 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:50:54,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 18:50:54,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-20 18:50:54,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:54,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-03-20 18:50:54,863 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 17 [2022-03-20 18:50:54,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:54,864 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-03-20 18:50:54,864 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:54,864 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-03-20 18:50:54,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:50:54,865 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:54,865 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:54,865 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:50:54,865 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:54,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:54,866 INFO L85 PathProgramCache]: Analyzing trace with hash 1181238037, now seen corresponding path program 1 times [2022-03-20 18:50:54,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:54,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1435020545] [2022-03-20 18:50:54,867 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 18:50:54,867 INFO L85 PathProgramCache]: Analyzing trace with hash 1181238037, now seen corresponding path program 2 times [2022-03-20 18:50:54,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:54,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775889944] [2022-03-20 18:50:54,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:54,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:54,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:54,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:54,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:54,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:54,951 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:54,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775889944] [2022-03-20 18:50:54,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775889944] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:54,951 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:54,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:50:54,952 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:54,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1435020545] [2022-03-20 18:50:54,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1435020545] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:54,952 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:54,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:50:54,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337727397] [2022-03-20 18:50:54,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:54,953 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 18:50:54,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:54,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 18:50:54,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 18:50:54,954 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:55,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:55,040 INFO L93 Difference]: Finished difference Result 47 states and 69 transitions. [2022-03-20 18:50:55,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 18:50:55,045 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-20 18:50:55,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:55,046 INFO L225 Difference]: With dead ends: 47 [2022-03-20 18:50:55,046 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 18:50:55,047 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:50:55,048 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 32 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:55,048 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 25 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:50:55,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 18:50:55,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 18:50:55,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.5) internal successors, (42), 28 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) [2022-03-20 18:50:55,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 46 transitions. [2022-03-20 18:50:55,058 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 46 transitions. Word has length 18 [2022-03-20 18:50:55,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:55,061 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 46 transitions. [2022-03-20 18:50:55,062 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:55,063 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 46 transitions. [2022-03-20 18:50:55,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:50:55,064 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:55,064 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:55,064 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:50:55,065 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:55,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:55,065 INFO L85 PathProgramCache]: Analyzing trace with hash -1710900860, now seen corresponding path program 1 times [2022-03-20 18:50:55,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:55,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [50022107] [2022-03-20 18:50:55,067 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 18:50:55,067 INFO L85 PathProgramCache]: Analyzing trace with hash -1710900860, now seen corresponding path program 2 times [2022-03-20 18:50:55,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:55,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157177148] [2022-03-20 18:50:55,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:55,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:55,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:55,129 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:55,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:55,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:55,145 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:55,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157177148] [2022-03-20 18:50:55,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157177148] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:55,145 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:55,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:50:55,146 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:55,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [50022107] [2022-03-20 18:50:55,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [50022107] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:55,146 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:55,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:50:55,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800266313] [2022-03-20 18:50:55,147 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:55,147 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 18:50:55,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:55,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 18:50:55,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 18:50:55,148 INFO L87 Difference]: Start difference. First operand 33 states and 46 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:55,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:55,221 INFO L93 Difference]: Finished difference Result 49 states and 69 transitions. [2022-03-20 18:50:55,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 18:50:55,222 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-20 18:50:55,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:55,222 INFO L225 Difference]: With dead ends: 49 [2022-03-20 18:50:55,223 INFO L226 Difference]: Without dead ends: 37 [2022-03-20 18:50:55,223 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:50:55,224 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 25 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:55,225 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 28 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:50:55,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-20 18:50:55,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-20 18:50:55,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:55,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2022-03-20 18:50:55,236 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 18 [2022-03-20 18:50:55,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:55,236 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2022-03-20 18:50:55,237 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:55,237 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2022-03-20 18:50:55,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:50:55,237 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:55,237 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:55,238 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 18:50:55,238 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:55,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:55,239 INFO L85 PathProgramCache]: Analyzing trace with hash 375506293, now seen corresponding path program 1 times [2022-03-20 18:50:55,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:55,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [352470222] [2022-03-20 18:50:55,429 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:50:55,434 INFO L85 PathProgramCache]: Analyzing trace with hash -289672842, now seen corresponding path program 1 times [2022-03-20 18:50:55,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:55,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246557257] [2022-03-20 18:50:55,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:55,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:55,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:55,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:55,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:55,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:50:55,593 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:55,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246557257] [2022-03-20 18:50:55,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246557257] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:50:55,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426012141] [2022-03-20 18:50:55,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:55,594 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:55,594 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:50:55,595 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:50:55,596 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 18:50:55,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:55,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:50:55,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:50:58,883 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:50:58,884 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 18:50:58,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426012141] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:58,884 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 18:50:58,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 10 [2022-03-20 18:50:59,002 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:59,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [352470222] [2022-03-20 18:50:59,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [352470222] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:59,002 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:59,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:50:59,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970784917] [2022-03-20 18:50:59,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:59,003 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:50:59,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:59,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:50:59,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:50:59,004 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:59,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:59,073 INFO L93 Difference]: Finished difference Result 49 states and 65 transitions. [2022-03-20 18:50:59,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:50:59,075 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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 20 [2022-03-20 18:50:59,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:59,075 INFO L225 Difference]: With dead ends: 49 [2022-03-20 18:50:59,075 INFO L226 Difference]: Without dead ends: 38 [2022-03-20 18:50:59,076 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:50:59,077 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 8 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:59,077 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 67 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 24 Invalid, 0 Unknown, 41 Unchecked, 0.0s Time] [2022-03-20 18:50:59,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-20 18:50:59,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-20 18:50:59,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 33 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:59,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 52 transitions. [2022-03-20 18:50:59,087 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 52 transitions. Word has length 20 [2022-03-20 18:50:59,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:59,087 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 52 transitions. [2022-03-20 18:50:59,091 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:59,091 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 52 transitions. [2022-03-20 18:50:59,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:50:59,092 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:59,092 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:59,118 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 18:50:59,308 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:59,309 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:59,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:59,310 INFO L85 PathProgramCache]: Analyzing trace with hash -1300031754, now seen corresponding path program 1 times [2022-03-20 18:50:59,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:59,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1488654869] [2022-03-20 18:50:59,607 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:50:59,608 INFO L85 PathProgramCache]: Analyzing trace with hash 313424023, now seen corresponding path program 1 times [2022-03-20 18:50:59,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:59,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47725180] [2022-03-20 18:50:59,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:59,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:59,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:59,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:59,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:59,698 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:50:59,699 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:59,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47725180] [2022-03-20 18:50:59,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47725180] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:59,699 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:59,699 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:50:59,715 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:59,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1488654869] [2022-03-20 18:50:59,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1488654869] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:59,716 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:59,716 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:50:59,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778494561] [2022-03-20 18:50:59,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:59,717 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:50:59,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:59,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:50:59,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:50:59,718 INFO L87 Difference]: Start difference. First operand 38 states and 52 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:59,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:59,812 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-03-20 18:50:59,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:50:59,812 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-20 18:50:59,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:59,815 INFO L225 Difference]: With dead ends: 46 [2022-03-20 18:50:59,815 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 18:50:59,816 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:50:59,819 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 25 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:59,819 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 30 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:50:59,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 18:50:59,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-20 18:50:59,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 30 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) [2022-03-20 18:50:59,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 47 transitions. [2022-03-20 18:50:59,839 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 47 transitions. Word has length 20 [2022-03-20 18:50:59,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:59,840 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 47 transitions. [2022-03-20 18:50:59,840 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:59,840 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 47 transitions. [2022-03-20 18:50:59,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:50:59,841 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:59,841 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:59,841 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-20 18:50:59,841 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:59,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:59,842 INFO L85 PathProgramCache]: Analyzing trace with hash -68874311, now seen corresponding path program 2 times [2022-03-20 18:50:59,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:59,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1918477585] [2022-03-20 18:50:59,997 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:50:59,997 INFO L85 PathProgramCache]: Analyzing trace with hash 1628787190, now seen corresponding path program 1 times [2022-03-20 18:50:59,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:59,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644578618] [2022-03-20 18:50:59,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:00,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:00,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:00,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:00,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:00,177 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:00,178 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:00,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644578618] [2022-03-20 18:51:00,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644578618] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:00,180 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:00,180 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:51:00,322 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:00,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1918477585] [2022-03-20 18:51:00,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1918477585] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:00,322 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:00,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:51:00,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073680848] [2022-03-20 18:51:00,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:00,323 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:51:00,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:00,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:51:00,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:51:00,323 INFO L87 Difference]: Start difference. First operand 35 states and 47 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:00,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:00,437 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2022-03-20 18:51:00,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:51:00,438 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-20 18:51:00,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:00,439 INFO L225 Difference]: With dead ends: 45 [2022-03-20 18:51:00,439 INFO L226 Difference]: Without dead ends: 30 [2022-03-20 18:51:00,439 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:51:00,440 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 20 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:00,440 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 56 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 53 Invalid, 0 Unknown, 56 Unchecked, 0.1s Time] [2022-03-20 18:51:00,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-20 18:51:00,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-20 18:51:00,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:00,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2022-03-20 18:51:00,446 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 21 [2022-03-20 18:51:00,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:00,447 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2022-03-20 18:51:00,447 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:00,447 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2022-03-20 18:51:00,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:51:00,447 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:00,447 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:00,448 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-20 18:51:00,448 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:00,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:00,448 INFO L85 PathProgramCache]: Analyzing trace with hash 30273528, now seen corresponding path program 1 times [2022-03-20 18:51:00,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:00,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [192376208] [2022-03-20 18:51:00,608 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:00,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1779199497, now seen corresponding path program 1 times [2022-03-20 18:51:00,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:00,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673473746] [2022-03-20 18:51:00,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:00,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:00,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:00,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:00,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:00,683 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:00,684 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:00,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673473746] [2022-03-20 18:51:00,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673473746] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:00,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256170918] [2022-03-20 18:51:00,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:00,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:00,685 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:00,688 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:00,715 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 18:51:00,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:00,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 18:51:00,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:00,772 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:00,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:00,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:00,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256170918] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:00,831 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-20 18:51:00,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 6 [2022-03-20 18:51:00,844 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:00,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [192376208] [2022-03-20 18:51:00,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [192376208] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:00,844 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:00,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:51:00,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827961733] [2022-03-20 18:51:00,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:00,845 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:51:00,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:00,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:51:00,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:51:00,846 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:00,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:00,898 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-03-20 18:51:00,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:51:00,899 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 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 21 [2022-03-20 18:51:00,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:00,900 INFO L225 Difference]: With dead ends: 39 [2022-03-20 18:51:00,900 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:51:00,900 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 4 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:51:00,901 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 6 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:00,901 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:51:00,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:51:00,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2022-03-20 18:51:00,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:00,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2022-03-20 18:51:00,926 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 21 [2022-03-20 18:51:00,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:00,927 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2022-03-20 18:51:00,927 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:00,927 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2022-03-20 18:51:00,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:51:00,929 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:00,929 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:00,955 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:01,152 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,SelfDestructingSolverStorable7 [2022-03-20 18:51:01,152 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:01,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:01,153 INFO L85 PathProgramCache]: Analyzing trace with hash -1232820840, now seen corresponding path program 1 times [2022-03-20 18:51:01,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:01,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1535716919] [2022-03-20 18:51:01,303 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:01,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1038307497, now seen corresponding path program 1 times [2022-03-20 18:51:01,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:01,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876654560] [2022-03-20 18:51:01,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:01,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:01,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:01,411 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:01,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:01,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:01,419 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:01,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876654560] [2022-03-20 18:51:01,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876654560] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:01,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291012509] [2022-03-20 18:51:01,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:01,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:01,421 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:01,422 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:01,423 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 18:51:01,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:01,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:51:01,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:01,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:01,749 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:01,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291012509] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:01,750 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:01,750 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2022-03-20 18:51:01,820 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:01,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1535716919] [2022-03-20 18:51:01,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1535716919] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:01,820 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:01,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:51:01,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863060190] [2022-03-20 18:51:01,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:01,821 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:51:01,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:01,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:51:01,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:51:01,822 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:02,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:02,052 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-03-20 18:51:02,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:51:02,053 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-20 18:51:02,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:02,053 INFO L225 Difference]: With dead ends: 39 [2022-03-20 18:51:02,053 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 18:51:02,054 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:51:02,055 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 27 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:02,055 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 31 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:02,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 18:51:02,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-20 18:51:02,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 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) [2022-03-20 18:51:02,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-03-20 18:51:02,062 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 21 [2022-03-20 18:51:02,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:02,063 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-03-20 18:51:02,063 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:02,063 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-03-20 18:51:02,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:51:02,063 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:02,064 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:02,089 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:02,283 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:02,284 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:02,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:02,284 INFO L85 PathProgramCache]: Analyzing trace with hash -29884763, now seen corresponding path program 1 times [2022-03-20 18:51:02,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:02,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1276389615] [2022-03-20 18:51:02,433 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:02,433 INFO L85 PathProgramCache]: Analyzing trace with hash -595870458, now seen corresponding path program 1 times [2022-03-20 18:51:02,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:02,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835400163] [2022-03-20 18:51:02,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:02,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:02,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:02,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:02,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:02,490 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:02,491 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:02,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835400163] [2022-03-20 18:51:02,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835400163] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:02,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243520752] [2022-03-20 18:51:02,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:02,491 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:02,491 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:02,496 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:02,522 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 18:51:02,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:02,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:51:02,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:02,598 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:02,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:02,700 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:02,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243520752] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:02,701 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:02,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2022-03-20 18:51:02,720 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:02,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1276389615] [2022-03-20 18:51:02,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1276389615] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:02,720 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:02,721 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:51:02,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469998377] [2022-03-20 18:51:02,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:02,721 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:51:02,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:02,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:51:02,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:51:02,722 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:02,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:02,860 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2022-03-20 18:51:02,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:51:02,861 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:51:02,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:02,861 INFO L225 Difference]: With dead ends: 45 [2022-03-20 18:51:02,861 INFO L226 Difference]: Without dead ends: 38 [2022-03-20 18:51:02,862 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:51:02,862 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 29 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:02,863 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 34 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:02,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-20 18:51:02,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2022-03-20 18:51:02,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:02,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2022-03-20 18:51:02,882 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 22 [2022-03-20 18:51:02,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:02,882 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2022-03-20 18:51:02,882 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:02,882 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2022-03-20 18:51:02,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:51:02,883 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:02,883 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:02,909 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:03,107 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:03,108 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:03,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:03,108 INFO L85 PathProgramCache]: Analyzing trace with hash 1372943636, now seen corresponding path program 1 times [2022-03-20 18:51:03,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:03,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [542666815] [2022-03-20 18:51:03,266 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:03,266 INFO L85 PathProgramCache]: Analyzing trace with hash -1493974091, now seen corresponding path program 1 times [2022-03-20 18:51:03,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:03,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068049428] [2022-03-20 18:51:03,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:03,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:03,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:03,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:03,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:03,345 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:03,345 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:03,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068049428] [2022-03-20 18:51:03,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068049428] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:03,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674820724] [2022-03-20 18:51:03,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:03,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:03,346 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:03,347 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:03,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 18:51:03,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:03,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:51:03,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:03,471 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:03,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:03,591 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:03,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674820724] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:03,591 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:03,591 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2022-03-20 18:51:03,611 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:03,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [542666815] [2022-03-20 18:51:03,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [542666815] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:03,611 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:03,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:51:03,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762530957] [2022-03-20 18:51:03,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:03,612 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:51:03,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:03,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:51:03,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:51:03,612 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:03,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:03,820 INFO L93 Difference]: Finished difference Result 53 states and 73 transitions. [2022-03-20 18:51:03,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:51:03,821 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:51:03,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:03,822 INFO L225 Difference]: With dead ends: 53 [2022-03-20 18:51:03,822 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 18:51:03,822 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:51:03,823 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 38 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:03,823 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 37 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:03,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 18:51:03,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-03-20 18:51:03,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.5) internal successors, (54), 36 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:03,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 58 transitions. [2022-03-20 18:51:03,837 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 58 transitions. Word has length 22 [2022-03-20 18:51:03,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:03,837 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 58 transitions. [2022-03-20 18:51:03,837 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:03,837 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 58 transitions. [2022-03-20 18:51:03,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:51:03,838 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:03,838 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:03,862 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:04,039 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,SelfDestructingSolverStorable10 [2022-03-20 18:51:04,040 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:04,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:04,040 INFO L85 PathProgramCache]: Analyzing trace with hash 850717494, now seen corresponding path program 2 times [2022-03-20 18:51:04,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:04,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1259079051] [2022-03-20 18:51:04,187 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:04,187 INFO L85 PathProgramCache]: Analyzing trace with hash -22164969, now seen corresponding path program 1 times [2022-03-20 18:51:04,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:04,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883966581] [2022-03-20 18:51:04,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:04,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:04,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:04,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:04,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:04,257 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:04,257 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:04,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883966581] [2022-03-20 18:51:04,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883966581] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:04,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713914904] [2022-03-20 18:51:04,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:04,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:04,258 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:04,259 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:04,268 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 18:51:04,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:04,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:51:04,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:04,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:04,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:04,442 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:04,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713914904] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:04,443 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:04,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-20 18:51:04,459 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:04,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1259079051] [2022-03-20 18:51:04,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1259079051] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:04,459 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:04,459 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:51:04,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732143869] [2022-03-20 18:51:04,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:04,460 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:51:04,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:04,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:51:04,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:51:04,461 INFO L87 Difference]: Start difference. First operand 41 states and 58 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:04,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:04,670 INFO L93 Difference]: Finished difference Result 59 states and 82 transitions. [2022-03-20 18:51:04,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:51:04,671 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:51:04,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:04,672 INFO L225 Difference]: With dead ends: 59 [2022-03-20 18:51:04,672 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 18:51:04,672 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:51:04,672 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 29 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:04,673 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 47 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:04,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 18:51:04,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2022-03-20 18:51:04,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:04,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 55 transitions. [2022-03-20 18:51:04,698 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 55 transitions. Word has length 22 [2022-03-20 18:51:04,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:04,698 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 55 transitions. [2022-03-20 18:51:04,699 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:04,699 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 55 transitions. [2022-03-20 18:51:04,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:51:04,699 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:04,699 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:04,727 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:04,919 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:04,920 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:04,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:04,920 INFO L85 PathProgramCache]: Analyzing trace with hash -353925126, now seen corresponding path program 1 times [2022-03-20 18:51:04,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:04,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [158066896] [2022-03-20 18:51:05,068 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:05,068 INFO L85 PathProgramCache]: Analyzing trace with hash 42073337, now seen corresponding path program 1 times [2022-03-20 18:51:05,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:05,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653676149] [2022-03-20 18:51:05,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:05,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:05,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:05,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:05,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:05,189 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:05,189 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:05,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653676149] [2022-03-20 18:51:05,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653676149] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:05,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211639276] [2022-03-20 18:51:05,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:05,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:05,190 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:05,192 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:05,200 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 18:51:05,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:05,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:51:05,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:05,323 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:05,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:05,391 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:05,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211639276] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:05,392 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:05,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 11 [2022-03-20 18:51:05,453 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:05,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [158066896] [2022-03-20 18:51:05,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [158066896] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:05,453 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:05,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:51:05,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256892106] [2022-03-20 18:51:05,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:05,454 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:51:05,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:05,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:51:05,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:51:05,454 INFO L87 Difference]: Start difference. First operand 40 states and 55 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:05,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:05,715 INFO L93 Difference]: Finished difference Result 66 states and 92 transitions. [2022-03-20 18:51:05,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:51:05,715 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-20 18:51:05,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:05,716 INFO L225 Difference]: With dead ends: 66 [2022-03-20 18:51:05,716 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 18:51:05,716 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 44 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:51:05,717 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 32 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:05,717 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 48 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:05,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 18:51:05,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2022-03-20 18:51:05,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:05,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 61 transitions. [2022-03-20 18:51:05,730 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 61 transitions. Word has length 23 [2022-03-20 18:51:05,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:05,731 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 61 transitions. [2022-03-20 18:51:05,731 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:05,731 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 61 transitions. [2022-03-20 18:51:05,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:51:05,731 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:05,731 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:05,750 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:05,943 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:05,944 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:05,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:05,944 INFO L85 PathProgramCache]: Analyzing trace with hash -1894791784, now seen corresponding path program 2 times [2022-03-20 18:51:05,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:05,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1091691648] [2022-03-20 18:51:06,044 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:06,045 INFO L85 PathProgramCache]: Analyzing trace with hash 186757719, now seen corresponding path program 1 times [2022-03-20 18:51:06,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:06,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525389732] [2022-03-20 18:51:06,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:06,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:06,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:06,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:06,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:06,110 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:06,110 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:06,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525389732] [2022-03-20 18:51:06,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525389732] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:06,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848719441] [2022-03-20 18:51:06,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:06,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:06,110 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:06,112 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:06,126 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 18:51:06,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:06,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 18:51:06,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:06,215 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:06,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:06,316 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:06,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848719441] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:06,317 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:06,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2022-03-20 18:51:06,336 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:06,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1091691648] [2022-03-20 18:51:06,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1091691648] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:06,337 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:06,337 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:51:06,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382148162] [2022-03-20 18:51:06,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:06,337 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:51:06,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:06,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:51:06,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:51:06,338 INFO L87 Difference]: Start difference. First operand 44 states and 61 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:06,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:06,529 INFO L93 Difference]: Finished difference Result 56 states and 76 transitions. [2022-03-20 18:51:06,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:51:06,529 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-20 18:51:06,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:06,530 INFO L225 Difference]: With dead ends: 56 [2022-03-20 18:51:06,530 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 18:51:06,530 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:51:06,531 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:06,531 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 43 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:06,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 18:51:06,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2022-03-20 18:51:06,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 36 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:06,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 56 transitions. [2022-03-20 18:51:06,545 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 56 transitions. Word has length 23 [2022-03-20 18:51:06,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:06,545 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 56 transitions. [2022-03-20 18:51:06,546 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:06,546 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 56 transitions. [2022-03-20 18:51:06,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:51:06,546 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:06,546 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:06,571 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:06,747 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,SelfDestructingSolverStorable13 [2022-03-20 18:51:06,747 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:06,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:06,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1127800217, now seen corresponding path program 3 times [2022-03-20 18:51:06,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:06,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [214624645] [2022-03-20 18:51:06,835 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:06,836 INFO L85 PathProgramCache]: Analyzing trace with hash -1655666970, now seen corresponding path program 1 times [2022-03-20 18:51:06,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:06,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737482043] [2022-03-20 18:51:06,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:06,836 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:06,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:06,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:06,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:06,894 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:51:06,894 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:06,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737482043] [2022-03-20 18:51:06,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737482043] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:06,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [511834620] [2022-03-20 18:51:06,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:06,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:06,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:06,900 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:06,923 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 18:51:06,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:06,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:51:06,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:07,014 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:07,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:07,124 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:07,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [511834620] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:07,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:07,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 8] total 15 [2022-03-20 18:51:07,154 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:07,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [214624645] [2022-03-20 18:51:07,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [214624645] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:07,154 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:07,154 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:51:07,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970390162] [2022-03-20 18:51:07,154 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:07,154 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:51:07,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:07,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:51:07,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:51:07,155 INFO L87 Difference]: Start difference. First operand 41 states and 56 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:07,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:07,367 INFO L93 Difference]: Finished difference Result 79 states and 110 transitions. [2022-03-20 18:51:07,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:51:07,367 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-20 18:51:07,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:07,368 INFO L225 Difference]: With dead ends: 79 [2022-03-20 18:51:07,368 INFO L226 Difference]: Without dead ends: 71 [2022-03-20 18:51:07,368 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:51:07,369 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 53 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:07,369 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 39 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:07,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-20 18:51:07,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 47. [2022-03-20 18:51:07,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 42 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:07,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 65 transitions. [2022-03-20 18:51:07,393 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 65 transitions. Word has length 23 [2022-03-20 18:51:07,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:07,393 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 65 transitions. [2022-03-20 18:51:07,393 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:07,393 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 65 transitions. [2022-03-20 18:51:07,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 18:51:07,394 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:07,394 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:07,419 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:07,616 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,SelfDestructingSolverStorable14 [2022-03-20 18:51:07,616 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:07,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:07,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1947718100, now seen corresponding path program 2 times [2022-03-20 18:51:07,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:07,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [751404985] [2022-03-20 18:51:07,744 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:07,744 INFO L85 PathProgramCache]: Analyzing trace with hash -818774667, now seen corresponding path program 1 times [2022-03-20 18:51:07,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:07,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599756251] [2022-03-20 18:51:07,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:07,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:07,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:07,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:07,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:07,836 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:07,836 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:07,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599756251] [2022-03-20 18:51:07,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599756251] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:07,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321565404] [2022-03-20 18:51:07,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:07,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:07,836 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:07,838 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:07,863 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 18:51:07,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:07,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:51:07,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:07,958 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:07,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:08,001 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:08,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321565404] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:08,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:08,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 4] total 8 [2022-03-20 18:51:08,016 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:08,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [751404985] [2022-03-20 18:51:08,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [751404985] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:08,017 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:08,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:51:08,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015141887] [2022-03-20 18:51:08,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:08,017 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:51:08,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:08,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:51:08,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:51:08,018 INFO L87 Difference]: Start difference. First operand 47 states and 65 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 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) [2022-03-20 18:51:08,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:08,277 INFO L93 Difference]: Finished difference Result 87 states and 124 transitions. [2022-03-20 18:51:08,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:51:08,278 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 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 [2022-03-20 18:51:08,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:08,278 INFO L225 Difference]: With dead ends: 87 [2022-03-20 18:51:08,278 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 18:51:08,279 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:51:08,279 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 42 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:08,279 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 46 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:08,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 18:51:08,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 51. [2022-03-20 18:51:08,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 46 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:08,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 69 transitions. [2022-03-20 18:51:08,293 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 69 transitions. Word has length 24 [2022-03-20 18:51:08,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:08,294 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 69 transitions. [2022-03-20 18:51:08,294 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 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) [2022-03-20 18:51:08,294 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 69 transitions. [2022-03-20 18:51:08,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 18:51:08,294 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:08,294 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:08,313 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:08,503 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,SelfDestructingSolverStorable15 [2022-03-20 18:51:08,503 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:08,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:08,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1809241787, now seen corresponding path program 3 times [2022-03-20 18:51:08,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:08,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [325807807] [2022-03-20 18:51:08,638 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:08,639 INFO L85 PathProgramCache]: Analyzing trace with hash 431707430, now seen corresponding path program 1 times [2022-03-20 18:51:08,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:08,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696383965] [2022-03-20 18:51:08,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:08,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:08,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:08,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:08,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:08,702 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:08,702 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:08,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696383965] [2022-03-20 18:51:08,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696383965] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:08,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489513684] [2022-03-20 18:51:08,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:08,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:08,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:08,704 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:08,705 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 18:51:08,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:08,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:51:08,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:08,820 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:08,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:08,928 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:08,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489513684] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:08,928 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:08,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 13 [2022-03-20 18:51:08,953 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:08,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [325807807] [2022-03-20 18:51:08,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [325807807] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:08,953 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:08,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:51:08,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385546615] [2022-03-20 18:51:08,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:08,954 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:51:08,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:08,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:51:08,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:51:08,955 INFO L87 Difference]: Start difference. First operand 51 states and 69 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 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) [2022-03-20 18:51:09,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:09,094 INFO L93 Difference]: Finished difference Result 62 states and 80 transitions. [2022-03-20 18:51:09,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:51:09,094 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 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 [2022-03-20 18:51:09,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:09,095 INFO L225 Difference]: With dead ends: 62 [2022-03-20 18:51:09,095 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 18:51:09,095 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:51:09,096 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 29 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:09,096 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 34 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:09,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 18:51:09,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2022-03-20 18:51:09,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 38 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:09,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 59 transitions. [2022-03-20 18:51:09,107 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 59 transitions. Word has length 24 [2022-03-20 18:51:09,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:09,107 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 59 transitions. [2022-03-20 18:51:09,107 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 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) [2022-03-20 18:51:09,108 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 59 transitions. [2022-03-20 18:51:09,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 18:51:09,108 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:09,108 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:09,133 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:09,316 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,SelfDestructingSolverStorable16 [2022-03-20 18:51:09,317 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:09,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:09,317 INFO L85 PathProgramCache]: Analyzing trace with hash 1824672953, now seen corresponding path program 3 times [2022-03-20 18:51:09,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:09,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [637112999] [2022-03-20 18:51:09,463 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:09,463 INFO L85 PathProgramCache]: Analyzing trace with hash 1884211159, now seen corresponding path program 1 times [2022-03-20 18:51:09,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:09,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413587270] [2022-03-20 18:51:09,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:09,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:09,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:09,557 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:09,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:09,561 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:51:09,561 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:09,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413587270] [2022-03-20 18:51:09,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413587270] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:09,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119947060] [2022-03-20 18:51:09,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:09,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:09,562 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:09,564 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:09,572 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 18:51:09,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:09,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 18:51:09,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:09,671 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:09,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:09,711 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:09,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119947060] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:09,711 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:09,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 11 [2022-03-20 18:51:09,797 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:09,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [637112999] [2022-03-20 18:51:09,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [637112999] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:09,798 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:09,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:51:09,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490905730] [2022-03-20 18:51:09,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:09,798 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:51:09,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:09,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:51:09,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:51:09,799 INFO L87 Difference]: Start difference. First operand 43 states and 59 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 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) [2022-03-20 18:51:10,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:10,157 INFO L93 Difference]: Finished difference Result 73 states and 99 transitions. [2022-03-20 18:51:10,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:51:10,158 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 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 25 [2022-03-20 18:51:10,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:10,159 INFO L225 Difference]: With dead ends: 73 [2022-03-20 18:51:10,159 INFO L226 Difference]: Without dead ends: 63 [2022-03-20 18:51:10,159 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:51:10,160 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 47 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:10,160 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 35 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:10,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-20 18:51:10,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 44. [2022-03-20 18:51:10,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.435897435897436) internal successors, (56), 39 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:10,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 60 transitions. [2022-03-20 18:51:10,174 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 60 transitions. Word has length 25 [2022-03-20 18:51:10,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:10,174 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 60 transitions. [2022-03-20 18:51:10,174 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 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) [2022-03-20 18:51:10,174 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 60 transitions. [2022-03-20 18:51:10,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 18:51:10,175 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:10,175 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:10,197 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:10,397 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,SelfDestructingSolverStorable17 [2022-03-20 18:51:10,397 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:10,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:10,398 INFO L85 PathProgramCache]: Analyzing trace with hash 801149717, now seen corresponding path program 4 times [2022-03-20 18:51:10,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:10,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2145233603] [2022-03-20 18:51:10,490 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:10,490 INFO L85 PathProgramCache]: Analyzing trace with hash -1036254345, now seen corresponding path program 1 times [2022-03-20 18:51:10,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:10,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440540105] [2022-03-20 18:51:10,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:10,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:10,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:10,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:10,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:10,554 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:51:10,554 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:10,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440540105] [2022-03-20 18:51:10,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440540105] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:10,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298355080] [2022-03-20 18:51:10,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:10,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:10,555 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:10,560 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:10,561 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 18:51:10,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:10,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:51:10,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:10,657 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:10,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:10,691 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:51:10,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298355080] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:10,692 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:10,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 5] total 11 [2022-03-20 18:51:10,736 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:10,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2145233603] [2022-03-20 18:51:10,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2145233603] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:10,736 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:10,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:51:10,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674293521] [2022-03-20 18:51:10,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:10,737 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:51:10,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:10,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:51:10,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:51:10,737 INFO L87 Difference]: Start difference. First operand 44 states and 60 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:11,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:11,016 INFO L93 Difference]: Finished difference Result 72 states and 99 transitions. [2022-03-20 18:51:11,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:51:11,016 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 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 26 [2022-03-20 18:51:11,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:11,017 INFO L225 Difference]: With dead ends: 72 [2022-03-20 18:51:11,017 INFO L226 Difference]: Without dead ends: 62 [2022-03-20 18:51:11,017 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:51:11,018 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 42 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:11,018 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 35 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:11,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-03-20 18:51:11,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 55. [2022-03-20 18:51:11,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.44) internal successors, (72), 50 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:11,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 76 transitions. [2022-03-20 18:51:11,037 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 76 transitions. Word has length 26 [2022-03-20 18:51:11,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:11,037 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 76 transitions. [2022-03-20 18:51:11,037 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:11,037 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 76 transitions. [2022-03-20 18:51:11,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:51:11,038 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:11,038 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:11,062 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-03-20 18:51:11,260 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:11,260 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:11,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:11,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1041168377, now seen corresponding path program 2 times [2022-03-20 18:51:11,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:11,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1472285068] [2022-03-20 18:51:11,348 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:11,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1704592407, now seen corresponding path program 1 times [2022-03-20 18:51:11,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:11,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978784789] [2022-03-20 18:51:11,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:11,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:11,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:11,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:11,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:11,455 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:11,455 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:11,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978784789] [2022-03-20 18:51:11,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978784789] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:11,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665818428] [2022-03-20 18:51:11,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:11,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:11,456 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:11,457 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:11,488 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 18:51:11,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:11,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:51:11,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:11,663 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:11,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:11,962 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:11,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665818428] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:11,963 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:11,963 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 19 [2022-03-20 18:51:12,020 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:12,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1472285068] [2022-03-20 18:51:12,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1472285068] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:12,020 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:12,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:51:12,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803119566] [2022-03-20 18:51:12,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:12,021 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:51:12,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:12,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:51:12,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:51:12,022 INFO L87 Difference]: Start difference. First operand 55 states and 76 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:12,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:12,633 INFO L93 Difference]: Finished difference Result 83 states and 114 transitions. [2022-03-20 18:51:12,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:51:12,634 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 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 27 [2022-03-20 18:51:12,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:12,634 INFO L225 Difference]: With dead ends: 83 [2022-03-20 18:51:12,634 INFO L226 Difference]: Without dead ends: 78 [2022-03-20 18:51:12,635 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 49 SyntacticMatches, 4 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:51:12,635 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:12,636 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 48 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:51:12,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-20 18:51:12,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 61. [2022-03-20 18:51:12,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.4464285714285714) internal successors, (81), 56 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:12,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 85 transitions. [2022-03-20 18:51:12,661 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 85 transitions. Word has length 27 [2022-03-20 18:51:12,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:12,661 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 85 transitions. [2022-03-20 18:51:12,661 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:12,661 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 85 transitions. [2022-03-20 18:51:12,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:51:12,661 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:12,661 INFO L499 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:12,681 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-03-20 18:51:12,875 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:12,875 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:12,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:12,876 INFO L85 PathProgramCache]: Analyzing trace with hash 1651223545, now seen corresponding path program 4 times [2022-03-20 18:51:12,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:12,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [714990212] [2022-03-20 18:51:13,016 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:13,017 INFO L85 PathProgramCache]: Analyzing trace with hash -191944617, now seen corresponding path program 1 times [2022-03-20 18:51:13,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:13,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464772114] [2022-03-20 18:51:13,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:13,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:13,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:13,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:13,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:13,136 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:13,136 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:13,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464772114] [2022-03-20 18:51:13,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464772114] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:13,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094957602] [2022-03-20 18:51:13,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:13,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:13,137 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:13,138 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:13,169 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 18:51:13,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:13,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:51:13,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:13,294 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:51:13,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:13,418 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:51:13,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094957602] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:13,418 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:13,418 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 18 [2022-03-20 18:51:13,466 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:13,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [714990212] [2022-03-20 18:51:13,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [714990212] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:13,467 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:13,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:51:13,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836602329] [2022-03-20 18:51:13,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:13,467 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:51:13,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:13,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:51:13,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:51:13,471 INFO L87 Difference]: Start difference. First operand 61 states and 85 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 11 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:13,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:13,846 INFO L93 Difference]: Finished difference Result 94 states and 127 transitions. [2022-03-20 18:51:13,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:51:13,847 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 11 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 27 [2022-03-20 18:51:13,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:13,847 INFO L225 Difference]: With dead ends: 94 [2022-03-20 18:51:13,847 INFO L226 Difference]: Without dead ends: 68 [2022-03-20 18:51:13,848 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:51:13,848 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 31 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:13,849 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 53 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:51:13,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-20 18:51:13,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 57. [2022-03-20 18:51:13,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.4230769230769231) internal successors, (74), 52 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:13,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 78 transitions. [2022-03-20 18:51:13,875 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 78 transitions. Word has length 27 [2022-03-20 18:51:13,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:13,875 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 78 transitions. [2022-03-20 18:51:13,875 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 11 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:13,875 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 78 transitions. [2022-03-20 18:51:13,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:51:13,875 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:13,875 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:13,903 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:14,091 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:14,091 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:14,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:14,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1516338727, now seen corresponding path program 5 times [2022-03-20 18:51:14,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:14,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [760199610] [2022-03-20 18:51:14,214 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:14,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1571131785, now seen corresponding path program 1 times [2022-03-20 18:51:14,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:14,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016970073] [2022-03-20 18:51:14,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:14,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:14,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:14,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:14,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:14,333 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:14,333 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:14,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016970073] [2022-03-20 18:51:14,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016970073] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:14,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182120602] [2022-03-20 18:51:14,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:14,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:14,334 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:14,335 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:14,346 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 18:51:14,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:14,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:51:14,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:14,485 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:14,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:14,654 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:14,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182120602] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:14,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:14,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2022-03-20 18:51:14,702 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:14,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [760199610] [2022-03-20 18:51:14,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [760199610] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:14,703 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:14,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:51:14,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452457523] [2022-03-20 18:51:14,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:14,703 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:51:14,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:14,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:51:14,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:51:14,704 INFO L87 Difference]: Start difference. First operand 57 states and 78 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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) [2022-03-20 18:51:15,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:15,763 INFO L93 Difference]: Finished difference Result 119 states and 167 transitions. [2022-03-20 18:51:15,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-20 18:51:15,764 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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 [2022-03-20 18:51:15,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:15,764 INFO L225 Difference]: With dead ends: 119 [2022-03-20 18:51:15,765 INFO L226 Difference]: Without dead ends: 81 [2022-03-20 18:51:15,765 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 55 SyntacticMatches, 7 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=378, Invalid=1602, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:51:15,766 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 84 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:15,766 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 65 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:51:15,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-20 18:51:15,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 68. [2022-03-20 18:51:15,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.380952380952381) internal successors, (87), 63 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:15,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 91 transitions. [2022-03-20 18:51:15,793 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 91 transitions. Word has length 27 [2022-03-20 18:51:15,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:15,793 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 91 transitions. [2022-03-20 18:51:15,793 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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) [2022-03-20 18:51:15,794 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 91 transitions. [2022-03-20 18:51:15,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 18:51:15,794 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:15,794 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:15,811 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:15,998 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 18:51:15,998 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:15,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:15,999 INFO L85 PathProgramCache]: Analyzing trace with hash 982849365, now seen corresponding path program 3 times [2022-03-20 18:51:15,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:15,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [55034069] [2022-03-20 18:51:16,131 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:16,131 INFO L85 PathProgramCache]: Analyzing trace with hash -1110682057, now seen corresponding path program 1 times [2022-03-20 18:51:16,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:16,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738647968] [2022-03-20 18:51:16,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:16,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:16,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:16,272 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:16,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:16,278 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:51:16,278 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:16,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738647968] [2022-03-20 18:51:16,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738647968] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:16,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134432406] [2022-03-20 18:51:16,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:16,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:16,279 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:16,280 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:16,281 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 18:51:16,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:16,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 18:51:16,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:16,367 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:51:16,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:16,450 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:51:16,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134432406] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:16,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:16,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5] total 10 [2022-03-20 18:51:16,571 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:16,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [55034069] [2022-03-20 18:51:16,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [55034069] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:16,571 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:16,571 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:51:16,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495833484] [2022-03-20 18:51:16,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:16,572 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:51:16,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:16,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:51:16,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:51:16,573 INFO L87 Difference]: Start difference. First operand 68 states and 91 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:17,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:17,053 INFO L93 Difference]: Finished difference Result 110 states and 152 transitions. [2022-03-20 18:51:17,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:51:17,054 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-20 18:51:17,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:17,054 INFO L225 Difference]: With dead ends: 110 [2022-03-20 18:51:17,054 INFO L226 Difference]: Without dead ends: 95 [2022-03-20 18:51:17,055 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=394, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:51:17,055 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 43 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:17,055 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 52 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:51:17,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-20 18:51:17,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 70. [2022-03-20 18:51:17,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.353846153846154) internal successors, (88), 65 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:17,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 92 transitions. [2022-03-20 18:51:17,083 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 92 transitions. Word has length 28 [2022-03-20 18:51:17,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:17,083 INFO L478 AbstractCegarLoop]: Abstraction has 70 states and 92 transitions. [2022-03-20 18:51:17,083 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:17,083 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 92 transitions. [2022-03-20 18:51:17,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 18:51:17,084 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:17,084 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:17,100 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-03-20 18:51:17,284 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:17,284 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:17,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:17,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1492099036, now seen corresponding path program 6 times [2022-03-20 18:51:17,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:17,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1208134139] [2022-03-20 18:51:17,399 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:17,399 INFO L85 PathProgramCache]: Analyzing trace with hash 314390214, now seen corresponding path program 1 times [2022-03-20 18:51:17,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:17,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685772887] [2022-03-20 18:51:17,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:17,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:17,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:17,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:17,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:17,483 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 18:51:17,484 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:17,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685772887] [2022-03-20 18:51:17,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685772887] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:17,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394656781] [2022-03-20 18:51:17,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:17,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:17,484 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:17,488 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:17,528 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 18:51:17,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:17,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 18:51:17,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:17,772 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:17,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:17,866 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:17,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394656781] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:17,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:17,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 7] total 19 [2022-03-20 18:51:17,940 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:17,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1208134139] [2022-03-20 18:51:17,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1208134139] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:17,941 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:17,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:51:17,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226149951] [2022-03-20 18:51:17,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:17,941 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:51:17,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:17,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:51:17,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=368, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:51:17,942 INFO L87 Difference]: Start difference. First operand 70 states and 92 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:18,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:18,546 INFO L93 Difference]: Finished difference Result 187 states and 264 transitions. [2022-03-20 18:51:18,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:51:18,547 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-20 18:51:18,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:18,548 INFO L225 Difference]: With dead ends: 187 [2022-03-20 18:51:18,548 INFO L226 Difference]: Without dead ends: 169 [2022-03-20 18:51:18,548 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=755, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:51:18,549 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 96 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:18,549 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 49 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:51:18,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2022-03-20 18:51:18,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 81. [2022-03-20 18:51:18,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.355263157894737) internal successors, (103), 76 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:18,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 107 transitions. [2022-03-20 18:51:18,588 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 107 transitions. Word has length 28 [2022-03-20 18:51:18,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:18,588 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 107 transitions. [2022-03-20 18:51:18,588 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:18,589 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 107 transitions. [2022-03-20 18:51:18,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:51:18,589 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:18,589 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:18,605 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-03-20 18:51:18,790 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:18,790 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:18,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:18,790 INFO L85 PathProgramCache]: Analyzing trace with hash 939274105, now seen corresponding path program 4 times [2022-03-20 18:51:18,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:18,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1569385985] [2022-03-20 18:51:18,878 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:18,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1747422551, now seen corresponding path program 1 times [2022-03-20 18:51:18,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:18,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847537547] [2022-03-20 18:51:18,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:18,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:18,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:18,968 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:18,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:18,972 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:18,972 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:18,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847537547] [2022-03-20 18:51:18,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847537547] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:18,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801061405] [2022-03-20 18:51:18,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:18,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:18,972 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:18,973 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:18,982 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 18:51:19,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:19,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:51:19,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:19,102 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 18:51:19,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:19,166 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 18:51:19,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801061405] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:19,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:19,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2022-03-20 18:51:19,215 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:19,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1569385985] [2022-03-20 18:51:19,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1569385985] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:19,215 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:19,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:51:19,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002951570] [2022-03-20 18:51:19,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:19,216 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:51:19,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:19,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:51:19,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:51:19,217 INFO L87 Difference]: Start difference. First operand 81 states and 107 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:19,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:19,539 INFO L93 Difference]: Finished difference Result 135 states and 184 transitions. [2022-03-20 18:51:19,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:51:19,539 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 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 29 [2022-03-20 18:51:19,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:19,540 INFO L225 Difference]: With dead ends: 135 [2022-03-20 18:51:19,540 INFO L226 Difference]: Without dead ends: 130 [2022-03-20 18:51:19,540 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:51:19,541 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 60 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:19,541 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 44 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:51:19,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-03-20 18:51:19,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 89. [2022-03-20 18:51:19,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.380952380952381) internal successors, (116), 84 states have internal predecessors, (116), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:19,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 120 transitions. [2022-03-20 18:51:19,588 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 120 transitions. Word has length 29 [2022-03-20 18:51:19,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:19,589 INFO L478 AbstractCegarLoop]: Abstraction has 89 states and 120 transitions. [2022-03-20 18:51:19,589 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:19,589 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 120 transitions. [2022-03-20 18:51:19,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:51:19,589 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:19,589 INFO L499 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:19,609 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-03-20 18:51:19,800 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:19,800 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:19,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:19,801 INFO L85 PathProgramCache]: Analyzing trace with hash 2067331961, now seen corresponding path program 5 times [2022-03-20 18:51:19,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:19,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1598799718] [2022-03-20 18:51:19,916 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:19,916 INFO L85 PathProgramCache]: Analyzing trace with hash -777930345, now seen corresponding path program 1 times [2022-03-20 18:51:19,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:19,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651364512] [2022-03-20 18:51:19,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:19,917 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:19,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:20,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:20,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:20,050 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 18:51:20,050 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:20,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651364512] [2022-03-20 18:51:20,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651364512] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:20,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078186041] [2022-03-20 18:51:20,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:20,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:20,051 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:20,056 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:20,076 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 18:51:20,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:20,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:51:20,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:20,169 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 18:51:20,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:20,347 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 18:51:20,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078186041] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:20,347 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:20,347 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2022-03-20 18:51:20,401 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:20,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1598799718] [2022-03-20 18:51:20,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1598799718] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:20,401 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:20,401 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:51:20,401 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536383237] [2022-03-20 18:51:20,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:20,401 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:51:20,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:20,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:51:20,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:51:20,403 INFO L87 Difference]: Start difference. First operand 89 states and 120 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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) [2022-03-20 18:51:20,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:20,953 INFO L93 Difference]: Finished difference Result 114 states and 152 transitions. [2022-03-20 18:51:20,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 18:51:20,953 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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 29 [2022-03-20 18:51:20,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:20,954 INFO L225 Difference]: With dead ends: 114 [2022-03-20 18:51:20,954 INFO L226 Difference]: Without dead ends: 92 [2022-03-20 18:51:20,955 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 65 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=129, Invalid=627, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:51:20,955 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 38 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:20,955 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 60 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:51:20,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-03-20 18:51:20,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 84. [2022-03-20 18:51:20,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.379746835443038) internal successors, (109), 79 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:20,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 113 transitions. [2022-03-20 18:51:20,989 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 113 transitions. Word has length 29 [2022-03-20 18:51:20,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:20,989 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 113 transitions. [2022-03-20 18:51:20,989 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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) [2022-03-20 18:51:20,989 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 113 transitions. [2022-03-20 18:51:20,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:51:20,989 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:20,990 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:21,006 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:21,190 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,SelfDestructingSolverStorable25 [2022-03-20 18:51:21,190 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:21,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:21,190 INFO L85 PathProgramCache]: Analyzing trace with hash 522425753, now seen corresponding path program 6 times [2022-03-20 18:51:21,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:21,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2357775] [2022-03-20 18:51:21,324 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:21,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1681280009, now seen corresponding path program 1 times [2022-03-20 18:51:21,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:21,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111615264] [2022-03-20 18:51:21,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:21,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:21,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:21,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:21,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:21,427 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 18:51:21,427 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:21,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111615264] [2022-03-20 18:51:21,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111615264] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:21,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256805022] [2022-03-20 18:51:21,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:21,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:21,428 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:21,429 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:21,429 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 18:51:21,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:21,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:51:21,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:21,593 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:21,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:21,643 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:21,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256805022] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:21,644 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:21,644 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 14 [2022-03-20 18:51:21,729 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:21,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2357775] [2022-03-20 18:51:21,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2357775] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:21,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:21,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:51:21,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519282538] [2022-03-20 18:51:21,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:21,730 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:51:21,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:21,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:51:21,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:51:21,730 INFO L87 Difference]: Start difference. First operand 84 states and 113 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:22,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:22,377 INFO L93 Difference]: Finished difference Result 218 states and 308 transitions. [2022-03-20 18:51:22,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:51:22,378 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-20 18:51:22,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:22,379 INFO L225 Difference]: With dead ends: 218 [2022-03-20 18:51:22,379 INFO L226 Difference]: Without dead ends: 188 [2022-03-20 18:51:22,380 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=121, Invalid=529, Unknown=0, NotChecked=0, Total=650 [2022-03-20 18:51:22,380 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 114 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:22,380 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 59 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:51:22,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-03-20 18:51:22,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 91. [2022-03-20 18:51:22,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.372093023255814) internal successors, (118), 86 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:22,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 122 transitions. [2022-03-20 18:51:22,415 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 122 transitions. Word has length 29 [2022-03-20 18:51:22,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:22,415 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 122 transitions. [2022-03-20 18:51:22,416 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:22,416 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 122 transitions. [2022-03-20 18:51:22,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 18:51:22,416 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:22,416 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:22,432 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-20 18:51:22,616 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,SelfDestructingSolverStorable26 [2022-03-20 18:51:22,617 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:22,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:22,617 INFO L85 PathProgramCache]: Analyzing trace with hash -1414418204, now seen corresponding path program 5 times [2022-03-20 18:51:22,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:22,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1399319803] [2022-03-20 18:51:22,739 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:22,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1698563590, now seen corresponding path program 1 times [2022-03-20 18:51:22,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:22,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989678234] [2022-03-20 18:51:22,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:22,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:22,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:22,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:22,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:22,814 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 18:51:22,814 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:22,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989678234] [2022-03-20 18:51:22,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989678234] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:22,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1171394429] [2022-03-20 18:51:22,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:22,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:22,815 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:22,816 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:22,816 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 18:51:22,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:22,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:51:22,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:22,912 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 18:51:22,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:22,962 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 18:51:22,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1171394429] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:22,962 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:22,962 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 6 [2022-03-20 18:51:22,996 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:22,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1399319803] [2022-03-20 18:51:22,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1399319803] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:22,996 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:22,997 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:51:22,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106841903] [2022-03-20 18:51:22,997 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:22,997 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:51:22,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:22,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:51:22,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:51:22,997 INFO L87 Difference]: Start difference. First operand 91 states and 122 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 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) [2022-03-20 18:51:23,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:23,302 INFO L93 Difference]: Finished difference Result 113 states and 149 transitions. [2022-03-20 18:51:23,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:51:23,302 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 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 30 [2022-03-20 18:51:23,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:23,303 INFO L225 Difference]: With dead ends: 113 [2022-03-20 18:51:23,303 INFO L226 Difference]: Without dead ends: 102 [2022-03-20 18:51:23,303 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:51:23,304 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 38 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:23,304 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 42 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:51:23,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-20 18:51:23,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2022-03-20 18:51:23,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.367816091954023) internal successors, (119), 87 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:23,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 123 transitions. [2022-03-20 18:51:23,344 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 123 transitions. Word has length 30 [2022-03-20 18:51:23,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:23,344 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 123 transitions. [2022-03-20 18:51:23,344 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 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) [2022-03-20 18:51:23,344 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 123 transitions. [2022-03-20 18:51:23,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 18:51:23,345 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:23,345 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:23,364 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-20 18:51:23,555 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,SelfDestructingSolverStorable27 [2022-03-20 18:51:23,555 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:23,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:23,555 INFO L85 PathProgramCache]: Analyzing trace with hash -1097440363, now seen corresponding path program 7 times [2022-03-20 18:51:23,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:23,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1348299636] [2022-03-20 18:51:23,686 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:23,686 INFO L85 PathProgramCache]: Analyzing trace with hash 428957815, now seen corresponding path program 1 times [2022-03-20 18:51:23,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:23,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154668610] [2022-03-20 18:51:23,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:23,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:23,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:23,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:23,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:23,857 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:23,857 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:23,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154668610] [2022-03-20 18:51:23,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154668610] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:23,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252299435] [2022-03-20 18:51:23,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:23,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:23,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:23,860 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:23,888 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 18:51:23,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:23,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 18:51:23,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:24,049 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:24,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:24,336 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 5 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:51:24,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252299435] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:24,337 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:24,337 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2022-03-20 18:51:24,407 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:24,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1348299636] [2022-03-20 18:51:24,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1348299636] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:24,407 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:24,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:51:24,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883465914] [2022-03-20 18:51:24,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:24,408 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:51:24,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:24,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:51:24,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=332, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:51:24,408 INFO L87 Difference]: Start difference. First operand 92 states and 123 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:27,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:27,191 INFO L93 Difference]: Finished difference Result 178 states and 251 transitions. [2022-03-20 18:51:27,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-20 18:51:27,191 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 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 [2022-03-20 18:51:27,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:27,192 INFO L225 Difference]: With dead ends: 178 [2022-03-20 18:51:27,192 INFO L226 Difference]: Without dead ends: 134 [2022-03-20 18:51:27,194 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 58 SyntacticMatches, 11 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1024 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=716, Invalid=3316, Unknown=0, NotChecked=0, Total=4032 [2022-03-20 18:51:27,194 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 138 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:27,194 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 74 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:51:27,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-03-20 18:51:27,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 122. [2022-03-20 18:51:27,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.4017094017094016) internal successors, (164), 117 states have internal predecessors, (164), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:27,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 168 transitions. [2022-03-20 18:51:27,250 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 168 transitions. Word has length 30 [2022-03-20 18:51:27,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:27,250 INFO L478 AbstractCegarLoop]: Abstraction has 122 states and 168 transitions. [2022-03-20 18:51:27,250 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:27,250 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 168 transitions. [2022-03-20 18:51:27,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 18:51:27,251 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:27,251 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:27,267 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-03-20 18:51:27,451 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:27,452 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:27,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:27,452 INFO L85 PathProgramCache]: Analyzing trace with hash -427337179, now seen corresponding path program 8 times [2022-03-20 18:51:27,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:27,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1171372300] [2022-03-20 18:51:27,546 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:27,546 INFO L85 PathProgramCache]: Analyzing trace with hash -1716674458, now seen corresponding path program 1 times [2022-03-20 18:51:27,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:27,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479614067] [2022-03-20 18:51:27,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:27,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:27,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:27,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:27,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:27,655 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 18:51:27,656 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:27,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479614067] [2022-03-20 18:51:27,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479614067] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:27,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624220872] [2022-03-20 18:51:27,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:27,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:27,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:27,660 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:27,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 18:51:27,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:27,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:51:27,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:27,827 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 18:51:27,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:27,908 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 18:51:27,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624220872] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:27,909 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:27,909 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 12 [2022-03-20 18:51:27,992 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:27,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1171372300] [2022-03-20 18:51:27,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1171372300] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:27,992 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:27,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:51:27,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327102209] [2022-03-20 18:51:27,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:27,992 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:51:27,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:27,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:51:27,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:51:27,994 INFO L87 Difference]: Start difference. First operand 122 states and 168 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:28,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:28,752 INFO L93 Difference]: Finished difference Result 159 states and 219 transitions. [2022-03-20 18:51:28,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:51:28,752 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 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 30 [2022-03-20 18:51:28,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:28,753 INFO L225 Difference]: With dead ends: 159 [2022-03-20 18:51:28,753 INFO L226 Difference]: Without dead ends: 143 [2022-03-20 18:51:28,753 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=250, Invalid=940, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 18:51:28,754 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 63 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:28,754 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 46 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:51:28,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-03-20 18:51:28,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 129. [2022-03-20 18:51:28,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.3790322580645162) internal successors, (171), 124 states have internal predecessors, (171), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:28,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 175 transitions. [2022-03-20 18:51:28,821 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 175 transitions. Word has length 30 [2022-03-20 18:51:28,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:28,821 INFO L478 AbstractCegarLoop]: Abstraction has 129 states and 175 transitions. [2022-03-20 18:51:28,821 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:28,822 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 175 transitions. [2022-03-20 18:51:28,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:51:28,822 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:28,822 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:28,838 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-03-20 18:51:29,024 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:29,025 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:29,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:29,025 INFO L85 PathProgramCache]: Analyzing trace with hash -629277016, now seen corresponding path program 9 times [2022-03-20 18:51:29,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:29,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1540431070] [2022-03-20 18:51:29,149 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:29,149 INFO L85 PathProgramCache]: Analyzing trace with hash -139510138, now seen corresponding path program 1 times [2022-03-20 18:51:29,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:29,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523332116] [2022-03-20 18:51:29,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:29,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:29,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:29,300 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:29,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:29,303 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 18:51:29,303 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:29,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523332116] [2022-03-20 18:51:29,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523332116] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:29,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879287951] [2022-03-20 18:51:29,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:29,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:29,304 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:29,308 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:29,309 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 18:51:29,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:29,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 18:51:29,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:29,571 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:29,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:29,640 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:29,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879287951] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:29,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:29,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 16 [2022-03-20 18:51:29,734 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:29,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1540431070] [2022-03-20 18:51:29,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1540431070] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:29,735 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:29,735 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:51:29,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889364841] [2022-03-20 18:51:29,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:29,736 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:51:29,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:29,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:51:29,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:51:29,736 INFO L87 Difference]: Start difference. First operand 129 states and 175 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 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) [2022-03-20 18:51:30,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:30,672 INFO L93 Difference]: Finished difference Result 325 states and 477 transitions. [2022-03-20 18:51:30,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:51:30,674 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 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 31 [2022-03-20 18:51:30,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:30,675 INFO L225 Difference]: With dead ends: 325 [2022-03-20 18:51:30,675 INFO L226 Difference]: Without dead ends: 281 [2022-03-20 18:51:30,676 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=135, Invalid=677, Unknown=0, NotChecked=0, Total=812 [2022-03-20 18:51:30,676 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 107 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:30,676 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 87 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:51:30,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2022-03-20 18:51:30,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 137. [2022-03-20 18:51:30,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.371212121212121) internal successors, (181), 132 states have internal predecessors, (181), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:30,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 185 transitions. [2022-03-20 18:51:30,751 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 185 transitions. Word has length 31 [2022-03-20 18:51:30,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:30,751 INFO L478 AbstractCegarLoop]: Abstraction has 137 states and 185 transitions. [2022-03-20 18:51:30,751 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 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) [2022-03-20 18:51:30,751 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 185 transitions. [2022-03-20 18:51:30,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:51:30,752 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:30,752 INFO L499 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:30,769 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:30,956 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-03-20 18:51:30,956 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:30,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:30,957 INFO L85 PathProgramCache]: Analyzing trace with hash 96842421, now seen corresponding path program 6 times [2022-03-20 18:51:30,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:30,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1735565555] [2022-03-20 18:51:31,074 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:31,075 INFO L85 PathProgramCache]: Analyzing trace with hash -1893718441, now seen corresponding path program 1 times [2022-03-20 18:51:31,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:31,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555873287] [2022-03-20 18:51:31,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:31,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:31,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:31,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:31,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:31,206 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:51:31,206 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:31,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555873287] [2022-03-20 18:51:31,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555873287] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:31,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280986133] [2022-03-20 18:51:31,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:31,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:31,206 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:31,207 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:31,208 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 18:51:31,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:31,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:51:31,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:31,374 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:31,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:31,628 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:31,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280986133] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:31,629 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:31,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11] total 18 [2022-03-20 18:51:31,702 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:31,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1735565555] [2022-03-20 18:51:31,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1735565555] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:31,703 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:31,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:51:31,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289955861] [2022-03-20 18:51:31,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:31,703 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:51:31,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:31,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:51:31,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:51:31,704 INFO L87 Difference]: Start difference. First operand 137 states and 185 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:32,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:32,542 INFO L93 Difference]: Finished difference Result 226 states and 312 transitions. [2022-03-20 18:51:32,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 18:51:32,542 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 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 32 [2022-03-20 18:51:32,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:32,543 INFO L225 Difference]: With dead ends: 226 [2022-03-20 18:51:32,543 INFO L226 Difference]: Without dead ends: 130 [2022-03-20 18:51:32,544 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=226, Invalid=1180, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:51:32,544 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 47 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:32,544 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 61 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:51:32,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-03-20 18:51:32,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 117. [2022-03-20 18:51:32,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.3839285714285714) internal successors, (155), 112 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:32,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 159 transitions. [2022-03-20 18:51:32,596 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 159 transitions. Word has length 32 [2022-03-20 18:51:32,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:32,596 INFO L478 AbstractCegarLoop]: Abstraction has 117 states and 159 transitions. [2022-03-20 18:51:32,596 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:32,596 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 159 transitions. [2022-03-20 18:51:32,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:51:32,597 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:32,597 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:32,615 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-03-20 18:51:32,804 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,SelfDestructingSolverStorable31 [2022-03-20 18:51:32,805 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:32,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:32,805 INFO L85 PathProgramCache]: Analyzing trace with hash -106095820, now seen corresponding path program 4 times [2022-03-20 18:51:32,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:32,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [620543388] [2022-03-20 18:51:32,928 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:32,928 INFO L85 PathProgramCache]: Analyzing trace with hash 562939381, now seen corresponding path program 1 times [2022-03-20 18:51:32,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:32,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784659437] [2022-03-20 18:51:32,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:32,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:32,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:33,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:33,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:33,100 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:51:33,100 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:33,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784659437] [2022-03-20 18:51:33,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784659437] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:33,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729371892] [2022-03-20 18:51:33,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:33,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:33,101 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:33,104 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:33,136 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 18:51:33,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:33,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:51:33,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:33,384 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:33,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:33,818 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:51:33,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729371892] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:33,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:33,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 12] total 27 [2022-03-20 18:51:34,013 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:34,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [620543388] [2022-03-20 18:51:34,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [620543388] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:34,014 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:34,014 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:51:34,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86512199] [2022-03-20 18:51:34,014 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:34,014 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:51:34,014 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:34,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:51:34,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:51:34,015 INFO L87 Difference]: Start difference. First operand 117 states and 159 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:35,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:35,752 INFO L93 Difference]: Finished difference Result 143 states and 191 transitions. [2022-03-20 18:51:35,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 18:51:35,753 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 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 32 [2022-03-20 18:51:35,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:35,753 INFO L225 Difference]: With dead ends: 143 [2022-03-20 18:51:35,753 INFO L226 Difference]: Without dead ends: 138 [2022-03-20 18:51:35,754 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 50 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=480, Invalid=2600, Unknown=0, NotChecked=0, Total=3080 [2022-03-20 18:51:35,754 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 82 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:35,755 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 64 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:51:35,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-03-20 18:51:35,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 109. [2022-03-20 18:51:35,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.3365384615384615) internal successors, (139), 104 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:35,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 143 transitions. [2022-03-20 18:51:35,816 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 143 transitions. Word has length 32 [2022-03-20 18:51:35,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:35,816 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 143 transitions. [2022-03-20 18:51:35,816 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:35,816 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 143 transitions. [2022-03-20 18:51:35,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 18:51:35,817 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:35,817 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:35,835 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-03-20 18:51:36,024 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:36,024 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:36,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:36,024 INFO L85 PathProgramCache]: Analyzing trace with hash 503233447, now seen corresponding path program 10 times [2022-03-20 18:51:36,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:36,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [359598772] [2022-03-20 18:51:36,146 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:36,146 INFO L85 PathProgramCache]: Analyzing trace with hash -224976698, now seen corresponding path program 1 times [2022-03-20 18:51:36,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:36,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083216468] [2022-03-20 18:51:36,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:36,147 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:36,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:36,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:36,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:36,394 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:36,395 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:36,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083216468] [2022-03-20 18:51:36,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083216468] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:36,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981764896] [2022-03-20 18:51:36,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:36,395 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:36,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:36,400 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:36,406 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 18:51:36,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:36,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:51:36,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:36,682 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:36,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:37,265 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:37,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981764896] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:37,265 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:37,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 14] total 28 [2022-03-20 18:51:37,518 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:37,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [359598772] [2022-03-20 18:51:37,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [359598772] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:37,518 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:37,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:51:37,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514576507] [2022-03-20 18:51:37,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:37,519 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:51:37,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:37,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:51:37,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=856, Unknown=0, NotChecked=0, Total=930 [2022-03-20 18:51:37,519 INFO L87 Difference]: Start difference. First operand 109 states and 143 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:48,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:48,139 INFO L93 Difference]: Finished difference Result 219 states and 303 transitions. [2022-03-20 18:51:48,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-03-20 18:51:48,140 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 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 [2022-03-20 18:51:48,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:48,141 INFO L225 Difference]: With dead ends: 219 [2022-03-20 18:51:48,141 INFO L226 Difference]: Without dead ends: 168 [2022-03-20 18:51:48,143 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2223 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=1195, Invalid=7547, Unknown=0, NotChecked=0, Total=8742 [2022-03-20 18:51:48,143 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 192 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 283 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 283 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:48,143 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 84 Invalid, 914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [283 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 18:51:48,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-03-20 18:51:48,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 143. [2022-03-20 18:51:48,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.3695652173913044) internal successors, (189), 138 states have internal predecessors, (189), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:48,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 193 transitions. [2022-03-20 18:51:48,215 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 193 transitions. Word has length 33 [2022-03-20 18:51:48,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:48,215 INFO L478 AbstractCegarLoop]: Abstraction has 143 states and 193 transitions. [2022-03-20 18:51:48,216 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:48,216 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 193 transitions. [2022-03-20 18:51:48,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 18:51:48,216 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:48,216 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:48,233 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-20 18:51:48,420 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:48,421 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:48,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:48,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1746970838, now seen corresponding path program 11 times [2022-03-20 18:51:48,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:48,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1102328362] [2022-03-20 18:51:48,543 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:48,543 INFO L85 PathProgramCache]: Analyzing trace with hash 849881047, now seen corresponding path program 1 times [2022-03-20 18:51:48,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:48,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620231494] [2022-03-20 18:51:48,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:48,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:48,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:48,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:48,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:48,770 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-03-20 18:51:48,770 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:48,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620231494] [2022-03-20 18:51:48,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620231494] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:48,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748699722] [2022-03-20 18:51:48,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:48,771 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:48,771 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:48,772 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:48,773 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 18:51:48,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:48,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 18:51:48,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:49,567 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:51:49,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:50,089 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:51:50,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748699722] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:50,090 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:50,090 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 9] total 31 [2022-03-20 18:51:50,511 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:50,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1102328362] [2022-03-20 18:51:50,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1102328362] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:50,511 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:50,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:51:50,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778252129] [2022-03-20 18:51:50,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:50,512 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:51:50,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:50,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:51:50,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1018, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:51:50,512 INFO L87 Difference]: Start difference. First operand 143 states and 193 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:52,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:52,502 INFO L93 Difference]: Finished difference Result 425 states and 624 transitions. [2022-03-20 18:51:52,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 18:51:52,503 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-20 18:51:52,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:52,505 INFO L225 Difference]: With dead ends: 425 [2022-03-20 18:51:52,505 INFO L226 Difference]: Without dead ends: 380 [2022-03-20 18:51:52,505 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=236, Invalid=2020, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:51:52,506 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 153 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:52,506 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 63 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:51:52,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2022-03-20 18:51:52,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 153. [2022-03-20 18:51:52,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 148 states have (on average 1.364864864864865) internal successors, (202), 148 states have internal predecessors, (202), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:52,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 206 transitions. [2022-03-20 18:51:52,589 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 206 transitions. Word has length 34 [2022-03-20 18:51:52,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:52,589 INFO L478 AbstractCegarLoop]: Abstraction has 153 states and 206 transitions. [2022-03-20 18:51:52,589 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:52,589 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 206 transitions. [2022-03-20 18:51:52,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 18:51:52,590 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:52,590 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:52,606 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-20 18:51:52,790 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:52,791 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:52,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:52,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1050639595, now seen corresponding path program 12 times [2022-03-20 18:51:52,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:52,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2065005186] [2022-03-20 18:51:52,916 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:52,917 INFO L85 PathProgramCache]: Analyzing trace with hash -1692789417, now seen corresponding path program 1 times [2022-03-20 18:51:52,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:52,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035843987] [2022-03-20 18:51:52,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:52,917 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:52,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:53,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:53,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:53,081 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 18:51:53,081 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:53,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035843987] [2022-03-20 18:51:53,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035843987] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:53,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216630264] [2022-03-20 18:51:53,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:53,082 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:53,082 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:53,083 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:53,083 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 18:51:53,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:53,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 18:51:53,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:53,299 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 18:51:53,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:53,356 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-20 18:51:53,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216630264] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:53,356 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:53,356 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 16 [2022-03-20 18:51:53,633 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:53,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2065005186] [2022-03-20 18:51:53,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2065005186] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:53,633 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:53,633 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:51:53,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687886902] [2022-03-20 18:51:53,633 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:53,634 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:51:53,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:53,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:51:53,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:51:53,634 INFO L87 Difference]: Start difference. First operand 153 states and 206 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:55,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:55,830 INFO L93 Difference]: Finished difference Result 218 states and 300 transitions. [2022-03-20 18:51:55,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-20 18:51:55,831 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-20 18:51:55,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:55,832 INFO L225 Difference]: With dead ends: 218 [2022-03-20 18:51:55,832 INFO L226 Difference]: Without dead ends: 200 [2022-03-20 18:51:55,832 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=369, Invalid=1983, Unknown=0, NotChecked=0, Total=2352 [2022-03-20 18:51:55,833 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 79 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:55,833 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 46 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:51:55,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-03-20 18:51:55,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 162. [2022-03-20 18:51:55,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 157 states have (on average 1.3439490445859872) internal successors, (211), 157 states have internal predecessors, (211), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:55,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 215 transitions. [2022-03-20 18:51:55,923 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 215 transitions. Word has length 34 [2022-03-20 18:51:55,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:55,923 INFO L478 AbstractCegarLoop]: Abstraction has 162 states and 215 transitions. [2022-03-20 18:51:55,923 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:55,923 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 215 transitions. [2022-03-20 18:51:55,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:51:55,923 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:55,924 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:55,939 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-03-20 18:51:56,124 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,SelfDestructingSolverStorable35 [2022-03-20 18:51:56,124 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:56,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:56,125 INFO L85 PathProgramCache]: Analyzing trace with hash 289270042, now seen corresponding path program 7 times [2022-03-20 18:51:56,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:56,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1430078070] [2022-03-20 18:51:56,247 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:56,247 INFO L85 PathProgramCache]: Analyzing trace with hash -2075141703, now seen corresponding path program 1 times [2022-03-20 18:51:56,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:56,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812601519] [2022-03-20 18:51:56,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:56,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:56,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:56,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:56,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:56,431 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:51:56,431 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:56,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812601519] [2022-03-20 18:51:56,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812601519] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:56,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62411040] [2022-03-20 18:51:56,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:56,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:56,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:56,432 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:56,433 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 18:51:56,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:56,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:51:56,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:56,570 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 18:51:56,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:56,653 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 18:51:56,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62411040] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:56,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:56,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2022-03-20 18:51:56,835 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:56,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1430078070] [2022-03-20 18:51:56,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1430078070] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:56,835 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:56,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:51:56,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076039131] [2022-03-20 18:51:56,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:56,836 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:51:56,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:56,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:51:56,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:51:56,837 INFO L87 Difference]: Start difference. First operand 162 states and 215 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 10 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:57,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:51:57,682 INFO L93 Difference]: Finished difference Result 251 states and 350 transitions. [2022-03-20 18:51:57,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:51:57,683 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 10 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 35 [2022-03-20 18:51:57,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:51:57,684 INFO L225 Difference]: With dead ends: 251 [2022-03-20 18:51:57,684 INFO L226 Difference]: Without dead ends: 246 [2022-03-20 18:51:57,685 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:51:57,685 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 71 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:51:57,685 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 52 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:51:57,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2022-03-20 18:51:57,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 176. [2022-03-20 18:51:57,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 171 states have (on average 1.368421052631579) internal successors, (234), 171 states have internal predecessors, (234), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:57,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 238 transitions. [2022-03-20 18:51:57,810 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 238 transitions. Word has length 35 [2022-03-20 18:51:57,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:51:57,810 INFO L478 AbstractCegarLoop]: Abstraction has 176 states and 238 transitions. [2022-03-20 18:51:57,811 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 10 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:51:57,811 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 238 transitions. [2022-03-20 18:51:57,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:51:57,811 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:51:57,811 INFO L499 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:51:57,834 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-20 18:51:58,034 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,SelfDestructingSolverStorable36 [2022-03-20 18:51:58,034 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:51:58,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:51:58,035 INFO L85 PathProgramCache]: Analyzing trace with hash 1735513016, now seen corresponding path program 13 times [2022-03-20 18:51:58,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:58,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [117367821] [2022-03-20 18:51:58,159 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:51:58,160 INFO L85 PathProgramCache]: Analyzing trace with hash 1356368919, now seen corresponding path program 1 times [2022-03-20 18:51:58,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:51:58,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75208021] [2022-03-20 18:51:58,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:58,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:51:58,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:58,332 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:51:58,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:58,335 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:51:58,335 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:51:58,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75208021] [2022-03-20 18:51:58,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75208021] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:51:58,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652096722] [2022-03-20 18:51:58,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:51:58,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:51:58,336 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:51:58,340 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:51:58,369 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-20 18:51:58,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:51:58,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:51:58,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:51:58,495 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:51:58,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:51:58,785 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:51:58,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652096722] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:51:58,785 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:51:58,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2022-03-20 18:51:59,104 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:51:59,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [117367821] [2022-03-20 18:51:59,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [117367821] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:51:59,104 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:51:59,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:51:59,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019084263] [2022-03-20 18:51:59,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:51:59,105 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:51:59,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:51:59,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:51:59,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:51:59,106 INFO L87 Difference]: Start difference. First operand 176 states and 238 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:01,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:52:01,069 INFO L93 Difference]: Finished difference Result 217 states and 290 transitions. [2022-03-20 18:52:01,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 18:52:01,070 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 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 35 [2022-03-20 18:52:01,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:52:01,071 INFO L225 Difference]: With dead ends: 217 [2022-03-20 18:52:01,071 INFO L226 Difference]: Without dead ends: 189 [2022-03-20 18:52:01,072 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 76 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=223, Invalid=1337, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:52:01,072 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 69 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:52:01,072 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 66 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:52:01,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2022-03-20 18:52:01,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 169. [2022-03-20 18:52:01,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.3719512195121952) internal successors, (225), 164 states have internal predecessors, (225), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:01,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 229 transitions. [2022-03-20 18:52:01,212 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 229 transitions. Word has length 35 [2022-03-20 18:52:01,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:52:01,213 INFO L478 AbstractCegarLoop]: Abstraction has 169 states and 229 transitions. [2022-03-20 18:52:01,213 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:01,213 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 229 transitions. [2022-03-20 18:52:01,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:52:01,213 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:52:01,213 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:52:01,237 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-20 18:52:01,436 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-03-20 18:52:01,437 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:52:01,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:52:01,437 INFO L85 PathProgramCache]: Analyzing trace with hash -759177288, now seen corresponding path program 14 times [2022-03-20 18:52:01,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:01,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [895836946] [2022-03-20 18:52:01,563 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:52:01,563 INFO L85 PathProgramCache]: Analyzing trace with hash 846946263, now seen corresponding path program 1 times [2022-03-20 18:52:01,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:52:01,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215524291] [2022-03-20 18:52:01,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:01,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:52:01,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:01,965 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:52:01,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:01,968 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:52:01,968 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:52:01,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215524291] [2022-03-20 18:52:01,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215524291] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:52:01,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057180249] [2022-03-20 18:52:01,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:01,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:01,969 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:52:01,970 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:52:01,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-20 18:52:02,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:02,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:52:02,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:52:02,287 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:02,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:52:02,933 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 7 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:02,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057180249] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:52:02,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:52:02,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 24 [2022-03-20 18:52:03,307 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:52:03,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [895836946] [2022-03-20 18:52:03,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [895836946] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:52:03,308 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:52:03,308 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:52:03,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846575408] [2022-03-20 18:52:03,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:52:03,308 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:52:03,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:03,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:52:03,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=634, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:52:03,309 INFO L87 Difference]: Start difference. First operand 169 states and 229 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 19 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:20,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:52:20,234 INFO L93 Difference]: Finished difference Result 320 states and 457 transitions. [2022-03-20 18:52:20,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-03-20 18:52:20,236 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 19 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-20 18:52:20,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:52:20,238 INFO L225 Difference]: With dead ends: 320 [2022-03-20 18:52:20,238 INFO L226 Difference]: Without dead ends: 236 [2022-03-20 18:52:20,241 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 65 SyntacticMatches, 11 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4083 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=2041, Invalid=10615, Unknown=0, NotChecked=0, Total=12656 [2022-03-20 18:52:20,241 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 256 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 816 mSolverCounterSat, 397 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 1213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:52:20,242 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 98 Invalid, 1213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 816 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-03-20 18:52:20,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2022-03-20 18:52:20,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 212. [2022-03-20 18:52:20,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 207 states have (on average 1.4057971014492754) internal successors, (291), 207 states have internal predecessors, (291), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:20,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 295 transitions. [2022-03-20 18:52:20,388 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 295 transitions. Word has length 35 [2022-03-20 18:52:20,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:52:20,389 INFO L478 AbstractCegarLoop]: Abstraction has 212 states and 295 transitions. [2022-03-20 18:52:20,389 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 19 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:20,389 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 295 transitions. [2022-03-20 18:52:20,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 18:52:20,389 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:52:20,389 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:52:20,405 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-03-20 18:52:20,590 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,SelfDestructingSolverStorable38 [2022-03-20 18:52:20,590 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:52:20,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:52:20,590 INFO L85 PathProgramCache]: Analyzing trace with hash 2040976357, now seen corresponding path program 8 times [2022-03-20 18:52:20,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:20,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [231011086] [2022-03-20 18:52:20,712 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:52:20,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1704953830, now seen corresponding path program 1 times [2022-03-20 18:52:20,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:52:20,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059929059] [2022-03-20 18:52:20,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:20,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:52:20,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:20,879 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:52:20,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:20,882 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 18:52:20,882 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:52:20,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059929059] [2022-03-20 18:52:20,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059929059] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:52:20,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002525029] [2022-03-20 18:52:20,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:20,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:20,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:52:20,884 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:52:20,884 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-20 18:52:20,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:20,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:52:20,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:52:21,156 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:52:21,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:52:21,722 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:52:21,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002525029] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:52:21,723 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:52:21,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 13] total 20 [2022-03-20 18:52:22,078 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:52:22,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [231011086] [2022-03-20 18:52:22,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [231011086] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:52:22,078 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:52:22,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:52:22,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618790403] [2022-03-20 18:52:22,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:52:22,078 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:52:22,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:22,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:52:22,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:52:22,079 INFO L87 Difference]: Start difference. First operand 212 states and 295 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:23,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:52:23,848 INFO L93 Difference]: Finished difference Result 244 states and 335 transitions. [2022-03-20 18:52:23,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:52:23,851 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 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 36 [2022-03-20 18:52:23,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:52:23,852 INFO L225 Difference]: With dead ends: 244 [2022-03-20 18:52:23,852 INFO L226 Difference]: Without dead ends: 230 [2022-03-20 18:52:23,853 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=190, Invalid=1216, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:52:23,853 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 42 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:52:23,853 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 52 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:52:23,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2022-03-20 18:52:24,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 213. [2022-03-20 18:52:24,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 208 states have (on average 1.4038461538461537) internal successors, (292), 208 states have internal predecessors, (292), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:24,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 296 transitions. [2022-03-20 18:52:24,054 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 296 transitions. Word has length 36 [2022-03-20 18:52:24,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:52:24,055 INFO L478 AbstractCegarLoop]: Abstraction has 213 states and 296 transitions. [2022-03-20 18:52:24,055 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:24,055 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 296 transitions. [2022-03-20 18:52:24,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 18:52:24,055 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:52:24,056 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:52:24,085 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-20 18:52:24,275 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-20 18:52:24,275 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:52:24,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:52:24,276 INFO L85 PathProgramCache]: Analyzing trace with hash 1266943717, now seen corresponding path program 15 times [2022-03-20 18:52:24,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:24,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2078847115] [2022-03-20 18:52:24,399 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:52:24,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1950291162, now seen corresponding path program 1 times [2022-03-20 18:52:24,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:52:24,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412168414] [2022-03-20 18:52:24,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:24,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:52:24,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:24,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:52:24,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:24,852 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-03-20 18:52:24,852 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:52:24,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412168414] [2022-03-20 18:52:24,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412168414] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:52:24,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098835233] [2022-03-20 18:52:24,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:24,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:24,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:52:24,854 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:52:24,855 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-20 18:52:24,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:24,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:52:24,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:52:25,449 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:52:25,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:52:25,525 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:52:25,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098835233] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:52:25,525 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:52:25,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 20 [2022-03-20 18:52:26,011 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:52:26,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2078847115] [2022-03-20 18:52:26,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2078847115] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:52:26,011 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:52:26,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:52:26,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7051474] [2022-03-20 18:52:26,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:52:26,012 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:52:26,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:26,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:52:26,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:52:26,012 INFO L87 Difference]: Start difference. First operand 213 states and 296 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:28,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:52:28,849 INFO L93 Difference]: Finished difference Result 594 states and 900 transitions. [2022-03-20 18:52:28,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:52:28,851 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 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 36 [2022-03-20 18:52:28,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:52:28,853 INFO L225 Difference]: With dead ends: 594 [2022-03-20 18:52:28,853 INFO L226 Difference]: Without dead ends: 513 [2022-03-20 18:52:28,853 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=214, Invalid=1192, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:52:28,853 INFO L913 BasicCegarLoop]: 52 mSDtfsCounter, 162 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:52:28,854 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 74 Invalid, 744 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-20 18:52:28,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2022-03-20 18:52:29,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 223. [2022-03-20 18:52:29,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 218 states have (on average 1.3944954128440368) internal successors, (304), 218 states have internal predecessors, (304), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:29,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 308 transitions. [2022-03-20 18:52:29,021 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 308 transitions. Word has length 36 [2022-03-20 18:52:29,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:52:29,021 INFO L478 AbstractCegarLoop]: Abstraction has 223 states and 308 transitions. [2022-03-20 18:52:29,021 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:29,021 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 308 transitions. [2022-03-20 18:52:29,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:52:29,022 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:52:29,022 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:52:29,037 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-03-20 18:52:29,222 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:29,222 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:52:29,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:52:29,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1959719609, now seen corresponding path program 16 times [2022-03-20 18:52:29,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:29,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2017740796] [2022-03-20 18:52:29,350 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:52:29,350 INFO L85 PathProgramCache]: Analyzing trace with hash -2033022746, now seen corresponding path program 1 times [2022-03-20 18:52:29,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:52:29,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404185650] [2022-03-20 18:52:29,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:29,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:52:29,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:30,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:52:30,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:30,233 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:52:30,233 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:52:30,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404185650] [2022-03-20 18:52:30,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404185650] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:52:30,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1400399796] [2022-03-20 18:52:30,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:30,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:30,233 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:52:30,234 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:52:30,235 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-20 18:52:30,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:30,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:52:30,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:52:30,747 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:30,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:52:32,101 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:32,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1400399796] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:52:32,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:52:32,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 27 [2022-03-20 18:52:32,771 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:52:32,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2017740796] [2022-03-20 18:52:32,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2017740796] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:52:32,772 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:52:32,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 18:52:32,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849919293] [2022-03-20 18:52:32,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:52:32,772 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 18:52:32,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:32,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 18:52:32,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=794, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:52:32,773 INFO L87 Difference]: Start difference. First operand 223 states and 308 transitions. Second operand has 22 states, 22 states have (on average 1.5) internal successors, (33), 21 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:17,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:53:18,000 INFO L93 Difference]: Finished difference Result 409 states and 592 transitions. [2022-03-20 18:53:18,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-03-20 18:53:18,001 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5) internal successors, (33), 21 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 [2022-03-20 18:53:18,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:53:18,002 INFO L225 Difference]: With dead ends: 409 [2022-03-20 18:53:18,002 INFO L226 Difference]: Without dead ends: 294 [2022-03-20 18:53:18,004 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 70 SyntacticMatches, 10 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6790 ImplicationChecksByTransitivity, 42.8s TimeCoverageRelationStatistics Valid=3084, Invalid=16656, Unknown=0, NotChecked=0, Total=19740 [2022-03-20 18:53:18,004 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 359 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 971 mSolverCounterSat, 577 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 1548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 577 IncrementalHoareTripleChecker+Valid, 971 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:53:18,004 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [359 Valid, 108 Invalid, 1548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [577 Valid, 971 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-03-20 18:53:18,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2022-03-20 18:53:18,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 270. [2022-03-20 18:53:18,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 265 states have (on average 1.4188679245283018) internal successors, (376), 265 states have internal predecessors, (376), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:18,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 380 transitions. [2022-03-20 18:53:18,200 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 380 transitions. Word has length 37 [2022-03-20 18:53:18,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:53:18,200 INFO L478 AbstractCegarLoop]: Abstraction has 270 states and 380 transitions. [2022-03-20 18:53:18,200 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5) internal successors, (33), 21 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:18,200 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 380 transitions. [2022-03-20 18:53:18,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:53:18,201 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:53:18,201 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:53:18,217 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-03-20 18:53:18,401 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:53:18,401 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:53:18,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:53:18,402 INFO L85 PathProgramCache]: Analyzing trace with hash 784665945, now seen corresponding path program 5 times [2022-03-20 18:53:18,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:18,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1519362987] [2022-03-20 18:53:18,531 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:53:18,532 INFO L85 PathProgramCache]: Analyzing trace with hash 1590005143, now seen corresponding path program 1 times [2022-03-20 18:53:18,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:53:18,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936256544] [2022-03-20 18:53:18,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:53:18,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:53:18,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:19,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:53:19,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:19,096 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 3 proven. 27 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:53:19,096 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:53:19,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936256544] [2022-03-20 18:53:19,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936256544] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:53:19,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261541421] [2022-03-20 18:53:19,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:53:19,096 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:53:19,096 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:53:19,097 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:53:19,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-20 18:53:19,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:19,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 18:53:19,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:53:19,884 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:53:19,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:53:21,490 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:53:21,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1261541421] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:53:21,491 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:53:21,491 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 15] total 35 [2022-03-20 18:53:22,767 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:53:22,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1519362987] [2022-03-20 18:53:22,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1519362987] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:53:22,767 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:53:22,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:53:22,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052054916] [2022-03-20 18:53:22,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:53:22,768 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:53:22,768 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:22,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:53:22,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1304, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 18:53:22,769 INFO L87 Difference]: Start difference. First operand 270 states and 380 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:34,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:53:34,236 INFO L93 Difference]: Finished difference Result 344 states and 469 transitions. [2022-03-20 18:53:34,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-03-20 18:53:34,238 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 15 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 37 [2022-03-20 18:53:34,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:53:34,239 INFO L225 Difference]: With dead ends: 344 [2022-03-20 18:53:34,239 INFO L226 Difference]: Without dead ends: 318 [2022-03-20 18:53:34,240 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 55 SyntacticMatches, 4 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1719 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=1083, Invalid=6749, Unknown=0, NotChecked=0, Total=7832 [2022-03-20 18:53:34,240 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 139 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 654 mSolverCounterSat, 188 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 188 IncrementalHoareTripleChecker+Valid, 654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:53:34,240 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 72 Invalid, 842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [188 Valid, 654 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-20 18:53:34,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2022-03-20 18:53:34,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 256. [2022-03-20 18:53:34,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 251 states have (on average 1.3824701195219125) internal successors, (347), 251 states have internal predecessors, (347), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:34,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 351 transitions. [2022-03-20 18:53:34,428 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 351 transitions. Word has length 37 [2022-03-20 18:53:34,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:53:34,428 INFO L478 AbstractCegarLoop]: Abstraction has 256 states and 351 transitions. [2022-03-20 18:53:34,428 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:34,428 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 351 transitions. [2022-03-20 18:53:34,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 18:53:34,429 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:53:34,429 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:53:34,447 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-20 18:53:34,637 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:53:34,637 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:53:34,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:53:34,638 INFO L85 PathProgramCache]: Analyzing trace with hash -1590129866, now seen corresponding path program 17 times [2022-03-20 18:53:34,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:34,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [291620221] [2022-03-20 18:53:34,732 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:53:34,732 INFO L85 PathProgramCache]: Analyzing trace with hash -1044855817, now seen corresponding path program 1 times [2022-03-20 18:53:34,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:53:34,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125169547] [2022-03-20 18:53:34,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:53:34,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:53:34,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:35,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:53:35,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:35,744 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-03-20 18:53:35,744 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:53:35,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125169547] [2022-03-20 18:53:35,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125169547] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:53:35,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361726176] [2022-03-20 18:53:35,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:53:35,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:53:35,745 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:53:35,746 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:53:35,750 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-20 18:53:35,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:35,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:53:35,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:53:36,950 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:53:36,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:53:37,039 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:53:37,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361726176] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:53:37,039 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:53:37,040 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 22 [2022-03-20 18:53:38,011 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:53:38,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [291620221] [2022-03-20 18:53:38,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [291620221] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:53:38,011 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:53:38,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:53:38,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366669073] [2022-03-20 18:53:38,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:53:38,012 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:53:38,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:38,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:53:38,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2022-03-20 18:53:38,012 INFO L87 Difference]: Start difference. First operand 256 states and 351 transitions. Second operand has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:43,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:53:43,167 INFO L93 Difference]: Finished difference Result 758 states and 1132 transitions. [2022-03-20 18:53:43,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:53:43,169 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 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 38 [2022-03-20 18:53:43,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:53:43,171 INFO L225 Difference]: With dead ends: 758 [2022-03-20 18:53:43,171 INFO L226 Difference]: Without dead ends: 668 [2022-03-20 18:53:43,172 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=231, Invalid=1409, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 18:53:43,172 INFO L913 BasicCegarLoop]: 58 mSDtfsCounter, 201 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 678 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:53:43,172 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 75 Invalid, 860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 678 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 18:53:43,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2022-03-20 18:53:43,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 267. [2022-03-20 18:53:43,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 262 states have (on average 1.3740458015267176) internal successors, (360), 262 states have internal predecessors, (360), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:43,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 364 transitions. [2022-03-20 18:53:43,383 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 364 transitions. Word has length 38 [2022-03-20 18:53:43,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:53:43,383 INFO L478 AbstractCegarLoop]: Abstraction has 267 states and 364 transitions. [2022-03-20 18:53:43,383 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:43,383 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 364 transitions. [2022-03-20 18:53:43,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 18:53:43,384 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:53:43,384 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:53:43,401 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-03-20 18:53:43,584 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-03-20 18:53:43,585 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:53:43,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:53:43,585 INFO L85 PathProgramCache]: Analyzing trace with hash 78239141, now seen corresponding path program 18 times [2022-03-20 18:53:43,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:43,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1421312982] [2022-03-20 18:53:43,712 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:53:43,712 INFO L85 PathProgramCache]: Analyzing trace with hash 2103372422, now seen corresponding path program 1 times [2022-03-20 18:53:43,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:53:43,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667207353] [2022-03-20 18:53:43,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:53:43,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:53:43,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:44,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:53:44,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:44,243 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 15 proven. 15 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 18:53:44,243 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:53:44,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667207353] [2022-03-20 18:53:44,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667207353] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:53:44,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396382729] [2022-03-20 18:53:44,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:53:44,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:53:44,244 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:53:44,244 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:53:44,245 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-20 18:53:44,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:53:44,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-20 18:53:44,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:53:45,042 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 1 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:53:45,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:53:46,591 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 1 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:53:46,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396382729] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:53:46,592 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:53:46,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 18] total 40 [2022-03-20 18:53:49,026 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:53:49,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1421312982] [2022-03-20 18:53:49,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1421312982] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:53:49,026 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:53:49,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:53:49,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882324721] [2022-03-20 18:53:49,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:53:49,027 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:53:49,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:49,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:53:49,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1763, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:53:49,027 INFO L87 Difference]: Start difference. First operand 267 states and 364 transitions. Second operand has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:05,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:54:05,047 INFO L93 Difference]: Finished difference Result 358 states and 497 transitions. [2022-03-20 18:54:05,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-20 18:54:05,049 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 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 38 [2022-03-20 18:54:05,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:54:05,050 INFO L225 Difference]: With dead ends: 358 [2022-03-20 18:54:05,050 INFO L226 Difference]: Without dead ends: 334 [2022-03-20 18:54:05,050 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 46 SyntacticMatches, 5 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1489 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=1099, Invalid=6383, Unknown=0, NotChecked=0, Total=7482 [2022-03-20 18:54:05,051 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 97 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:54:05,051 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 47 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-20 18:54:05,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2022-03-20 18:54:05,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 278. [2022-03-20 18:54:05,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 273 states have (on average 1.358974358974359) internal successors, (371), 273 states have internal predecessors, (371), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:05,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 375 transitions. [2022-03-20 18:54:05,259 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 375 transitions. Word has length 38 [2022-03-20 18:54:05,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:54:05,259 INFO L478 AbstractCegarLoop]: Abstraction has 278 states and 375 transitions. [2022-03-20 18:54:05,259 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:05,259 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 375 transitions. [2022-03-20 18:54:05,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 18:54:05,260 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:54:05,260 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:54:05,278 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-03-20 18:54:05,461 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-03-20 18:54:05,461 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:54:05,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:54:05,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1447198440, now seen corresponding path program 19 times [2022-03-20 18:54:05,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:05,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [743554692] [2022-03-20 18:54:05,550 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:54:05,551 INFO L85 PathProgramCache]: Analyzing trace with hash -275107849, now seen corresponding path program 1 times [2022-03-20 18:54:05,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:54:05,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663213653] [2022-03-20 18:54:05,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:05,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:54:05,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:07,411 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:54:07,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:07,413 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:54:07,414 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:54:07,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663213653] [2022-03-20 18:54:07,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663213653] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:54:07,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280524090] [2022-03-20 18:54:07,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:07,414 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:54:07,414 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:54:07,415 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:54:07,416 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-20 18:54:07,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:07,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 18:54:07,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:54:08,346 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:54:08,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:54:10,981 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 9 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:54:10,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280524090] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:54:10,981 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:54:10,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 30 [2022-03-20 18:54:12,208 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:54:12,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [743554692] [2022-03-20 18:54:12,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [743554692] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:54:12,208 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:54:12,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 18:54:12,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976411298] [2022-03-20 18:54:12,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:54:12,209 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 18:54:12,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:12,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 18:54:12,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=972, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 18:54:12,209 INFO L87 Difference]: Start difference. First operand 278 states and 375 transitions. Second operand has 24 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:42,229 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:55:40,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:55:40,125 INFO L93 Difference]: Finished difference Result 493 states and 699 transitions. [2022-03-20 18:55:40,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-03-20 18:55:40,126 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 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 [2022-03-20 18:55:40,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:55:40,127 INFO L225 Difference]: With dead ends: 493 [2022-03-20 18:55:40,127 INFO L226 Difference]: Without dead ends: 368 [2022-03-20 18:55:40,129 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 73 SyntacticMatches, 11 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9512 ImplicationChecksByTransitivity, 85.4s TimeCoverageRelationStatistics Valid=4198, Invalid=23192, Unknown=0, NotChecked=0, Total=27390 [2022-03-20 18:55:40,129 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 405 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 1047 mSolverCounterSat, 747 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 1795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 747 IncrementalHoareTripleChecker+Valid, 1047 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:55:40,130 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [405 Valid, 113 Invalid, 1795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [747 Valid, 1047 Invalid, 1 Unknown, 0 Unchecked, 7.9s Time] [2022-03-20 18:55:40,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2022-03-20 18:55:40,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 330. [2022-03-20 18:55:40,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 325 states have (on average 1.3876923076923078) internal successors, (451), 325 states have internal predecessors, (451), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:55:40,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 455 transitions. [2022-03-20 18:55:40,420 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 455 transitions. Word has length 39 [2022-03-20 18:55:40,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:55:40,421 INFO L478 AbstractCegarLoop]: Abstraction has 330 states and 455 transitions. [2022-03-20 18:55:40,421 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:55:40,421 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 455 transitions. [2022-03-20 18:55:40,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 18:55:40,422 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:55:40,422 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:55:40,443 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-03-20 18:55:40,635 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-03-20 18:55:40,635 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:55:40,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:55:40,636 INFO L85 PathProgramCache]: Analyzing trace with hash 1413124485, now seen corresponding path program 20 times [2022-03-20 18:55:40,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:40,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [269928043] [2022-03-20 18:55:40,759 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:55:40,759 INFO L85 PathProgramCache]: Analyzing trace with hash 69586630, now seen corresponding path program 1 times [2022-03-20 18:55:40,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:55:40,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762597839] [2022-03-20 18:55:40,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:55:40,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:55:40,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:41,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:55:41,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:42,003 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-03-20 18:55:42,003 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:55:42,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762597839] [2022-03-20 18:55:42,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762597839] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:55:42,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377744602] [2022-03-20 18:55:42,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:55:42,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:55:42,004 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:55:42,008 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:55:42,012 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-20 18:55:42,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:42,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-20 18:55:42,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:55:45,088 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:55:45,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:55:45,597 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 9 proven. 81 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:55:45,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377744602] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:55:45,597 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:55:45,597 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21, 12] total 35 [2022-03-20 18:55:47,265 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:55:47,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [269928043] [2022-03-20 18:55:47,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [269928043] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:55:47,265 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:55:47,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:55:47,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737162681] [2022-03-20 18:55:47,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:55:47,265 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:55:47,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:47,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:55:47,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1288, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:55:47,266 INFO L87 Difference]: Start difference. First operand 330 states and 455 transitions. Second operand has 17 states, 17 states have (on average 1.6470588235294117) 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) [2022-03-20 18:55:55,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:55:55,439 INFO L93 Difference]: Finished difference Result 976 states and 1496 transitions. [2022-03-20 18:55:55,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 18:55:55,442 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.6470588235294117) 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 40 [2022-03-20 18:55:55,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:55:55,444 INFO L225 Difference]: With dead ends: 976 [2022-03-20 18:55:55,444 INFO L226 Difference]: Without dead ends: 862 [2022-03-20 18:55:55,444 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=280, Invalid=2690, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 18:55:55,445 INFO L913 BasicCegarLoop]: 66 mSDtfsCounter, 193 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 962 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 1125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 962 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:55:55,445 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 83 Invalid, 1125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 962 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-20 18:55:55,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 862 states. [2022-03-20 18:55:55,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 862 to 342. [2022-03-20 18:55:55,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 337 states have (on average 1.3798219584569733) internal successors, (465), 337 states have internal predecessors, (465), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:55:55,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 469 transitions. [2022-03-20 18:55:55,747 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 469 transitions. Word has length 40 [2022-03-20 18:55:55,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:55:55,747 INFO L478 AbstractCegarLoop]: Abstraction has 342 states and 469 transitions. [2022-03-20 18:55:55,747 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.6470588235294117) 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) [2022-03-20 18:55:55,747 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 469 transitions. [2022-03-20 18:55:55,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 18:55:55,748 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:55:55,748 INFO L499 BasicCegarLoop]: trace histogram [9, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:55:55,765 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-03-20 18:55:55,951 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-03-20 18:55:55,951 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:55:55,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:55:55,952 INFO L85 PathProgramCache]: Analyzing trace with hash 2099434202, now seen corresponding path program 9 times [2022-03-20 18:55:55,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:55,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [268421335] [2022-03-20 18:55:56,076 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:55:56,077 INFO L85 PathProgramCache]: Analyzing trace with hash -693160583, now seen corresponding path program 1 times [2022-03-20 18:55:56,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:55:56,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684094245] [2022-03-20 18:55:56,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:55:56,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:55:56,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:56,825 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:55:56,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:56,827 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 24 proven. 24 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:55:56,827 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:55:56,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684094245] [2022-03-20 18:55:56,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684094245] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:55:56,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753175848] [2022-03-20 18:55:56,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:55:56,828 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:55:56,828 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:55:56,829 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:55:56,830 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-20 18:55:56,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:55:56,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:55:56,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:55:57,109 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-03-20 18:55:57,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:55:57,316 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-03-20 18:55:57,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753175848] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:55:57,317 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:55:57,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 6] total 12 [2022-03-20 18:55:57,850 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:55:57,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [268421335] [2022-03-20 18:55:57,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [268421335] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:55:57,851 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:55:57,851 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:55:57,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096183789] [2022-03-20 18:55:57,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:55:57,851 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:55:57,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:57,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:55:57,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:55:57,855 INFO L87 Difference]: Start difference. First operand 342 states and 469 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:02,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:56:02,686 INFO L93 Difference]: Finished difference Result 551 states and 779 transitions. [2022-03-20 18:56:02,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-20 18:56:02,689 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 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 41 [2022-03-20 18:56:02,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:56:02,690 INFO L225 Difference]: With dead ends: 551 [2022-03-20 18:56:02,690 INFO L226 Difference]: Without dead ends: 346 [2022-03-20 18:56:02,690 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=269, Invalid=1537, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 18:56:02,691 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:56:02,691 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 72 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:56:02,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2022-03-20 18:56:02,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 316. [2022-03-20 18:56:02,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 311 states have (on average 1.3858520900321543) internal successors, (431), 311 states have internal predecessors, (431), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:02,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 435 transitions. [2022-03-20 18:56:02,949 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 435 transitions. Word has length 41 [2022-03-20 18:56:02,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:56:02,950 INFO L478 AbstractCegarLoop]: Abstraction has 316 states and 435 transitions. [2022-03-20 18:56:02,950 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:02,950 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 435 transitions. [2022-03-20 18:56:02,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 18:56:02,951 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:56:02,951 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:56:02,970 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-03-20 18:56:03,163 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:56:03,163 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:56:03,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:56:03,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1046867033, now seen corresponding path program 10 times [2022-03-20 18:56:03,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:03,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [287656623] [2022-03-20 18:56:03,253 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:56:03,253 INFO L85 PathProgramCache]: Analyzing trace with hash -625180905, now seen corresponding path program 1 times [2022-03-20 18:56:03,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:56:03,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290451870] [2022-03-20 18:56:03,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:03,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:56:03,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:03,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:56:03,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:03,842 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:56:03,842 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:56:03,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290451870] [2022-03-20 18:56:03,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290451870] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:56:03,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504689592] [2022-03-20 18:56:03,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:03,842 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:56:03,842 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:56:03,843 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:56:03,844 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-20 18:56:03,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:03,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:56:03,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:56:04,082 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:56:04,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:56:04,253 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:56:04,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504689592] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:56:04,253 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:56:04,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2022-03-20 18:56:05,261 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:56:05,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [287656623] [2022-03-20 18:56:05,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [287656623] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:56:05,261 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:56:05,261 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:56:05,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987255844] [2022-03-20 18:56:05,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:56:05,262 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:56:05,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:05,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:56:05,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:56:05,262 INFO L87 Difference]: Start difference. First operand 316 states and 435 transitions. Second operand has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:08,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:56:08,958 INFO L93 Difference]: Finished difference Result 475 states and 688 transitions. [2022-03-20 18:56:08,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:56:08,961 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-20 18:56:08,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:56:08,962 INFO L225 Difference]: With dead ends: 475 [2022-03-20 18:56:08,962 INFO L226 Difference]: Without dead ends: 470 [2022-03-20 18:56:08,962 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 87 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=155, Invalid=547, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:56:08,963 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 123 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:56:08,963 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 65 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-20 18:56:08,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2022-03-20 18:56:09,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 345. [2022-03-20 18:56:09,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 340 states have (on average 1.4147058823529413) internal successors, (481), 340 states have internal predecessors, (481), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:09,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 485 transitions. [2022-03-20 18:56:09,303 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 485 transitions. Word has length 41 [2022-03-20 18:56:09,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:56:09,303 INFO L478 AbstractCegarLoop]: Abstraction has 345 states and 485 transitions. [2022-03-20 18:56:09,304 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:09,304 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 485 transitions. [2022-03-20 18:56:09,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:56:09,305 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:56:09,305 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:56:09,331 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-03-20 18:56:09,519 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-03-20 18:56:09,519 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:56:09,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:56:09,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1383374916, now seen corresponding path program 11 times [2022-03-20 18:56:09,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:09,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [108821892] [2022-03-20 18:56:09,652 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:56:09,653 INFO L85 PathProgramCache]: Analyzing trace with hash 1291869446, now seen corresponding path program 1 times [2022-03-20 18:56:09,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:56:09,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915141200] [2022-03-20 18:56:09,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:09,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:56:09,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:10,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:56:10,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:10,584 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:56:10,584 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:56:10,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915141200] [2022-03-20 18:56:10,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915141200] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:56:10,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158135798] [2022-03-20 18:56:10,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:10,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:56:10,585 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:56:10,586 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:56:10,586 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-20 18:56:10,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:10,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 52 conjunts are in the unsatisfiable core [2022-03-20 18:56:10,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:56:12,537 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:56:12,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:56:14,451 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 5 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:56:14,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158135798] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:56:14,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:56:14,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 16, 19] total 34 [2022-03-20 18:56:17,204 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:56:17,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [108821892] [2022-03-20 18:56:17,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [108821892] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:56:17,204 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:56:17,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:56:17,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269778686] [2022-03-20 18:56:17,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:56:17,205 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:56:17,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:17,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:56:17,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1291, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:56:17,205 INFO L87 Difference]: Start difference. First operand 345 states and 485 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:25,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:56:25,755 INFO L93 Difference]: Finished difference Result 400 states and 552 transitions. [2022-03-20 18:56:25,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:56:25,763 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 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 42 [2022-03-20 18:56:25,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:56:25,764 INFO L225 Difference]: With dead ends: 400 [2022-03-20 18:56:25,764 INFO L226 Difference]: Without dead ends: 384 [2022-03-20 18:56:25,764 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 65 SyntacticMatches, 8 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=324, Invalid=2982, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 18:56:25,764 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 53 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:56:25,765 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 57 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:56:25,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2022-03-20 18:56:26,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 346. [2022-03-20 18:56:26,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 346 states, 341 states have (on average 1.4134897360703813) internal successors, (482), 341 states have internal predecessors, (482), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:26,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 486 transitions. [2022-03-20 18:56:26,096 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 486 transitions. Word has length 42 [2022-03-20 18:56:26,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:56:26,096 INFO L478 AbstractCegarLoop]: Abstraction has 346 states and 486 transitions. [2022-03-20 18:56:26,096 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:26,096 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 486 transitions. [2022-03-20 18:56:26,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:56:26,097 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:56:26,097 INFO L499 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:56:26,124 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-03-20 18:56:26,311 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-03-20 18:56:26,311 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:56:26,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:56:26,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1370793700, now seen corresponding path program 21 times [2022-03-20 18:56:26,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:26,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1947931488] [2022-03-20 18:56:26,399 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:56:26,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1481661286, now seen corresponding path program 1 times [2022-03-20 18:56:26,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:56:26,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65645836] [2022-03-20 18:56:26,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:26,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:56:26,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:27,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:56:27,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:27,076 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 25 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:56:27,076 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:56:27,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65645836] [2022-03-20 18:56:27,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65645836] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:56:27,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788449373] [2022-03-20 18:56:27,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:27,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:56:27,076 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:56:27,078 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:56:27,078 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-20 18:56:27,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:27,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-20 18:56:27,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:56:27,364 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 25 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:56:27,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:56:28,230 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 25 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:56:28,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1788449373] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:56:28,230 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:56:28,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 19 [2022-03-20 18:56:29,555 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:56:29,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1947931488] [2022-03-20 18:56:29,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1947931488] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:56:29,555 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:56:29,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:56:29,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788129334] [2022-03-20 18:56:29,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:56:29,555 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:56:29,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:29,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:56:29,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:56:29,556 INFO L87 Difference]: Start difference. First operand 346 states and 486 transitions. Second operand has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:39,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:56:39,398 INFO L93 Difference]: Finished difference Result 405 states and 561 transitions. [2022-03-20 18:56:39,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-20 18:56:39,400 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 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 42 [2022-03-20 18:56:39,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:56:39,402 INFO L225 Difference]: With dead ends: 405 [2022-03-20 18:56:39,402 INFO L226 Difference]: Without dead ends: 369 [2022-03-20 18:56:39,402 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 91 SyntacticMatches, 6 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 18:56:39,402 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 75 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 592 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:56:39,403 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 77 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 592 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-20 18:56:39,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2022-03-20 18:56:39,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 336. [2022-03-20 18:56:39,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 331 states have (on average 1.4199395770392749) internal successors, (470), 331 states have internal predecessors, (470), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:39,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 474 transitions. [2022-03-20 18:56:39,702 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 474 transitions. Word has length 42 [2022-03-20 18:56:39,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:56:39,703 INFO L478 AbstractCegarLoop]: Abstraction has 336 states and 474 transitions. [2022-03-20 18:56:39,703 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:56:39,703 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 474 transitions. [2022-03-20 18:56:39,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:56:39,704 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:56:39,704 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:56:39,722 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-03-20 18:56:39,911 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2022-03-20 18:56:39,911 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:56:39,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:56:39,912 INFO L85 PathProgramCache]: Analyzing trace with hash -965071804, now seen corresponding path program 22 times [2022-03-20 18:56:39,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:39,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1065614244] [2022-03-20 18:56:40,040 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:56:40,040 INFO L85 PathProgramCache]: Analyzing trace with hash -651831162, now seen corresponding path program 1 times [2022-03-20 18:56:40,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:56:40,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772170348] [2022-03-20 18:56:40,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:40,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:56:40,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:43,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:56:43,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:43,193 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:56:43,193 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:56:43,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772170348] [2022-03-20 18:56:43,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772170348] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:56:43,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348121457] [2022-03-20 18:56:43,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:56:43,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:56:43,194 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:56:43,195 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:56:43,197 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-20 18:56:43,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:56:43,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-20 18:56:43,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:56:44,849 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:56:44,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:56:49,218 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:56:49,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348121457] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:56:49,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:56:49,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 33 [2022-03-20 18:56:52,501 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:56:52,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1065614244] [2022-03-20 18:56:52,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1065614244] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:56:52,501 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:56:52,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 18:56:52,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038613338] [2022-03-20 18:56:52,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:56:52,502 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 18:56:52,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:56:52,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 18:56:52,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1235, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:56:52,502 INFO L87 Difference]: Start difference. First operand 336 states and 474 transitions. Second operand has 27 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 26 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:21,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:00:21,357 INFO L93 Difference]: Finished difference Result 630 states and 925 transitions. [2022-03-20 19:00:21,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2022-03-20 19:00:21,358 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 26 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 [2022-03-20 19:00:21,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:00:21,359 INFO L225 Difference]: With dead ends: 630 [2022-03-20 19:00:21,359 INFO L226 Difference]: Without dead ends: 435 [2022-03-20 19:00:21,361 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 77 SyntacticMatches, 10 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16865 ImplicationChecksByTransitivity, 206.2s TimeCoverageRelationStatistics Valid=6578, Invalid=37732, Unknown=0, NotChecked=0, Total=44310 [2022-03-20 19:00:21,362 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 538 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 1526 mSolverCounterSat, 992 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 538 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 2518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 992 IncrementalHoareTripleChecker+Valid, 1526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:00:21,362 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [538 Valid, 134 Invalid, 2518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [992 Valid, 1526 Invalid, 0 Unknown, 0 Unchecked, 13.4s Time] [2022-03-20 19:00:21,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435 states. [2022-03-20 19:00:21,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435 to 395. [2022-03-20 19:00:21,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 390 states have (on average 1.4384615384615385) internal successors, (561), 390 states have internal predecessors, (561), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:21,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 565 transitions. [2022-03-20 19:00:21,758 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 565 transitions. Word has length 42 [2022-03-20 19:00:21,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:00:21,759 INFO L478 AbstractCegarLoop]: Abstraction has 395 states and 565 transitions. [2022-03-20 19:00:21,759 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 26 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:21,759 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 565 transitions. [2022-03-20 19:00:21,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 19:00:21,759 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:00:21,759 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:00:21,775 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-03-20 19:00:21,960 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:00:21,960 INFO L403 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:00:21,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:00:21,960 INFO L85 PathProgramCache]: Analyzing trace with hash 29751636, now seen corresponding path program 6 times [2022-03-20 19:00:21,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:00:21,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1090734085] [2022-03-20 19:00:22,092 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:00:22,092 INFO L85 PathProgramCache]: Analyzing trace with hash 264517557, now seen corresponding path program 1 times [2022-03-20 19:00:22,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:00:22,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810251496] [2022-03-20 19:00:22,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:00:22,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:00:22,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:23,763 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:00:23,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:23,768 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 39 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 19:00:23,768 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:00:23,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810251496] [2022-03-20 19:00:23,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810251496] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:00:23,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364550062] [2022-03-20 19:00:23,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:00:23,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:00:23,770 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:00:23,771 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:00:23,772 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-03-20 19:00:23,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:23,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 19:00:23,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:00:24,822 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-03-20 19:00:24,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:00:25,162 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 5 proven. 30 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-03-20 19:00:25,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364550062] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:00:25,162 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:00:25,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 21 [2022-03-20 19:00:27,726 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:00:27,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1090734085] [2022-03-20 19:00:27,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1090734085] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:00:27,726 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:00:27,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 19:00:27,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245819120] [2022-03-20 19:00:27,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:00:27,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 19:00:27,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:00:27,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 19:00:27,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2022-03-20 19:00:27,727 INFO L87 Difference]: Start difference. First operand 395 states and 565 transitions. Second operand has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:52,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:00:52,897 INFO L93 Difference]: Finished difference Result 493 states and 683 transitions. [2022-03-20 19:00:52,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-03-20 19:00:52,899 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 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 42 [2022-03-20 19:00:52,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:00:52,901 INFO L225 Difference]: With dead ends: 493 [2022-03-20 19:00:52,901 INFO L226 Difference]: Without dead ends: 462 [2022-03-20 19:00:52,901 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 80 SyntacticMatches, 4 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2550 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=1111, Invalid=7261, Unknown=0, NotChecked=0, Total=8372 [2022-03-20 19:00:52,902 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 141 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 827 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 1058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-03-20 19:00:52,902 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 75 Invalid, 1058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 827 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-03-20 19:00:52,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2022-03-20 19:00:53,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 375. [2022-03-20 19:00:53,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 370 states have (on average 1.4054054054054055) internal successors, (520), 370 states have internal predecessors, (520), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:53,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 524 transitions. [2022-03-20 19:00:53,307 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 524 transitions. Word has length 42 [2022-03-20 19:00:53,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:00:53,308 INFO L478 AbstractCegarLoop]: Abstraction has 375 states and 524 transitions. [2022-03-20 19:00:53,308 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 18 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:00:53,308 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 524 transitions. [2022-03-20 19:00:53,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 19:00:53,309 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:00:53,309 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:00:53,328 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2022-03-20 19:00:53,518 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,48 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:00:53,519 INFO L403 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:00:53,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:00:53,519 INFO L85 PathProgramCache]: Analyzing trace with hash -1465117931, now seen corresponding path program 23 times [2022-03-20 19:00:53,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:00:53,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [735623460] [2022-03-20 19:00:53,609 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:00:53,610 INFO L85 PathProgramCache]: Analyzing trace with hash -1900652809, now seen corresponding path program 1 times [2022-03-20 19:00:53,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:00:53,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333035308] [2022-03-20 19:00:53,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:00:53,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:00:53,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:54,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:00:54,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:54,737 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-03-20 19:00:54,737 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:00:54,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333035308] [2022-03-20 19:00:54,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333035308] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:00:54,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373217343] [2022-03-20 19:00:54,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:00:54,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:00:54,737 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:00:54,738 INFO L229 MonitoredProcess]: Starting monitored process 49 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:00:54,739 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-03-20 19:00:54,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:00:54,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 19:00:54,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:00:56,802 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-03-20 19:00:56,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:00:57,641 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-03-20 19:00:57,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373217343] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:00:57,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:00:57,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 9] total 28 [2022-03-20 19:01:00,823 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:01:00,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [735623460] [2022-03-20 19:01:00,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [735623460] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:01:00,824 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:01:00,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 19:01:00,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055113375] [2022-03-20 19:01:00,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:01:00,824 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 19:01:00,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:01:00,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 19:01:00,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=975, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 19:01:00,825 INFO L87 Difference]: Start difference. First operand 375 states and 524 transitions. Second operand has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:01:31,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:01:31,539 INFO L93 Difference]: Finished difference Result 490 states and 696 transitions. [2022-03-20 19:01:31,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-03-20 19:01:31,542 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-20 19:01:31,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:01:31,543 INFO L225 Difference]: With dead ends: 490 [2022-03-20 19:01:31,544 INFO L226 Difference]: Without dead ends: 459 [2022-03-20 19:01:31,544 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 66 SyntacticMatches, 5 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2000 ImplicationChecksByTransitivity, 33.1s TimeCoverageRelationStatistics Valid=1068, Invalid=6588, Unknown=0, NotChecked=0, Total=7656 [2022-03-20 19:01:31,544 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 94 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 551 mSolverCounterSat, 225 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 225 IncrementalHoareTripleChecker+Valid, 551 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:01:31,545 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 57 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [225 Valid, 551 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-03-20 19:01:31,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2022-03-20 19:01:31,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 388. [2022-03-20 19:01:31,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 383 states have (on average 1.391644908616188) internal successors, (533), 383 states have internal predecessors, (533), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:01:31,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 537 transitions. [2022-03-20 19:01:31,962 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 537 transitions. Word has length 42 [2022-03-20 19:01:31,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:01:31,962 INFO L478 AbstractCegarLoop]: Abstraction has 388 states and 537 transitions. [2022-03-20 19:01:31,962 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:01:31,962 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 537 transitions. [2022-03-20 19:01:31,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 19:01:31,963 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:01:31,963 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:01:31,979 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-03-20 19:01:32,163 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,49 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:01:32,164 INFO L403 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:01:32,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:01:32,164 INFO L85 PathProgramCache]: Analyzing trace with hash -820818983, now seen corresponding path program 24 times [2022-03-20 19:01:32,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:01:32,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [303062238] [2022-03-20 19:01:32,296 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:01:32,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1940531351, now seen corresponding path program 1 times [2022-03-20 19:01:32,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:01:32,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186442513] [2022-03-20 19:01:32,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:01:32,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:01:32,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:01:35,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:01:35,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:01:35,378 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-03-20 19:01:35,378 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:01:35,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186442513] [2022-03-20 19:01:35,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186442513] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:01:35,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1780821759] [2022-03-20 19:01:35,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:01:35,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:01:35,379 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:01:35,380 INFO L229 MonitoredProcess]: Starting monitored process 50 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:01:35,381 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-03-20 19:01:35,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:01:35,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 19:01:35,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:01:38,729 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 10 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 19:01:38,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:01:38,880 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 10 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 19:01:38,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1780821759] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:01:38,881 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:01:38,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 26 [2022-03-20 19:01:43,428 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:01:43,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [303062238] [2022-03-20 19:01:43,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [303062238] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:01:43,428 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:01:43,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 19:01:43,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053873800] [2022-03-20 19:01:43,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:01:43,429 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 19:01:43,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:01:43,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 19:01:43,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2022-03-20 19:01:43,429 INFO L87 Difference]: Start difference. First operand 388 states and 537 transitions. Second operand has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:02:03,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:02:03,682 INFO L93 Difference]: Finished difference Result 1204 states and 1837 transitions. [2022-03-20 19:02:03,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 19:02:03,686 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 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 43 [2022-03-20 19:02:03,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:02:03,688 INFO L225 Difference]: With dead ends: 1204 [2022-03-20 19:02:03,688 INFO L226 Difference]: Without dead ends: 1058 [2022-03-20 19:02:03,689 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=331, Invalid=2119, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 19:02:03,689 INFO L913 BasicCegarLoop]: 67 mSDtfsCounter, 211 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1010 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 1206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 1010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:02:03,689 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 89 Invalid, 1206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 1010 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-03-20 19:02:03,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1058 states. [2022-03-20 19:02:04,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1058 to 402. [2022-03-20 19:02:04,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 397 states have (on average 1.385390428211587) internal successors, (550), 397 states have internal predecessors, (550), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:02:04,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 554 transitions. [2022-03-20 19:02:04,109 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 554 transitions. Word has length 43 [2022-03-20 19:02:04,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:02:04,109 INFO L478 AbstractCegarLoop]: Abstraction has 402 states and 554 transitions. [2022-03-20 19:02:04,109 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:02:04,109 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 554 transitions. [2022-03-20 19:02:04,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 19:02:04,110 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:02:04,110 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:02:04,129 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-03-20 19:02:04,319 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-03-20 19:02:04,319 INFO L403 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:02:04,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:02:04,320 INFO L85 PathProgramCache]: Analyzing trace with hash 1122311317, now seen corresponding path program 25 times [2022-03-20 19:02:04,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:02:04,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2086446409] [2022-03-20 19:02:04,457 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:02:04,458 INFO L85 PathProgramCache]: Analyzing trace with hash 2031804247, now seen corresponding path program 1 times [2022-03-20 19:02:04,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:02:04,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145315475] [2022-03-20 19:02:04,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:02:04,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:02:04,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:02:11,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:02:11,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:02:11,487 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 19:02:11,487 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:02:11,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145315475] [2022-03-20 19:02:11,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145315475] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:02:11,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823732106] [2022-03-20 19:02:11,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:02:11,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:02:11,488 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:02:11,492 INFO L229 MonitoredProcess]: Starting monitored process 51 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 19:02:11,495 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-03-20 19:02:11,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:02:11,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 19:02:11,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:02:14,441 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 123 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:02:14,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:02:22,556 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 11 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:02:22,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823732106] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:02:22,556 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:02:22,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 36 [2022-03-20 19:02:27,389 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:02:27,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2086446409] [2022-03-20 19:02:27,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2086446409] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:02:27,390 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:02:27,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 19:02:27,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290906851] [2022-03-20 19:02:27,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:02:27,390 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 19:02:27,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:02:27,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 19:02:27,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1455, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 19:02:27,391 INFO L87 Difference]: Start difference. First operand 402 states and 554 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 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)