/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-de52.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 08:22:28,166 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 08:22:28,168 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 08:22:28,203 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 08:22:28,240 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 08:22:28,240 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 08:22:28,242 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 08:22:28,242 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-19 08:22:28,251 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 08:22:28,251 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 08:22:28,252 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 08:22:28,252 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 08:22:28,252 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 08:22:28,252 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 08:22:28,252 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 08:22:28,252 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 08:22:28,252 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 08:22:28,253 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 08:22:28,253 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 08:22:28,253 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 08:22:28,253 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 08:22:28,253 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 08:22:28,254 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 08:22:28,254 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:22:28,254 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 08:22:28,254 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 08:22:28,254 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 08:22:28,254 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 08:22:28,254 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 08:22:28,254 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 08:22:28,254 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 08:22:28,440 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 08:22:28,463 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 08:22:28,465 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 08:22:28,466 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 08:22:28,466 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 08:22:28,467 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de52.c [2022-03-19 08:22:28,515 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aabcfd5b8/1e5e520818bb42438a05bae30b992169/FLAG2ad298b90 [2022-03-19 08:22:28,870 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 08:22:28,870 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de52.c [2022-03-19 08:22:28,875 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aabcfd5b8/1e5e520818bb42438a05bae30b992169/FLAG2ad298b90 [2022-03-19 08:22:28,888 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aabcfd5b8/1e5e520818bb42438a05bae30b992169 [2022-03-19 08:22:28,890 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 08:22:28,891 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 08:22:28,893 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 08:22:28,893 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 08:22:28,896 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 08:22:28,896 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:22:28" (1/1) ... [2022-03-19 08:22:28,898 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a920774 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:28, skipping insertion in model container [2022-03-19 08:22:28,898 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:22:28" (1/1) ... [2022-03-19 08:22:28,902 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 08:22:28,912 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 08:22:29,046 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-de52.c[368,381] [2022-03-19 08:22:29,060 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:22:29,065 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 08:22:29,073 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-de52.c[368,381] [2022-03-19 08:22:29,076 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:22:29,084 INFO L208 MainTranslator]: Completed translation [2022-03-19 08:22:29,085 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29 WrapperNode [2022-03-19 08:22:29,085 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 08:22:29,086 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 08:22:29,087 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 08:22:29,087 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 08:22:29,094 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (1/1) ... [2022-03-19 08:22:29,094 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (1/1) ... [2022-03-19 08:22:29,099 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (1/1) ... [2022-03-19 08:22:29,099 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (1/1) ... [2022-03-19 08:22:29,107 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (1/1) ... [2022-03-19 08:22:29,112 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (1/1) ... [2022-03-19 08:22:29,116 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (1/1) ... [2022-03-19 08:22:29,120 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 08:22:29,121 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 08:22:29,121 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 08:22:29,121 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 08:22:29,121 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (1/1) ... [2022-03-19 08:22:29,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:22:29,133 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:29,143 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-19 08:22:29,160 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-19 08:22:29,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 08:22:29,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 08:22:29,176 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 08:22:29,176 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 08:22:29,176 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 08:22:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 08:22:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 08:22:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 08:22:29,177 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 08:22:29,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-19 08:22:29,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 08:22:29,177 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 08:22:29,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 08:22:29,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 08:22:29,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 08:22:29,178 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 08:22:29,179 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 08:22:29,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 08:22:29,220 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 08:22:29,221 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 08:22:29,315 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 08:22:29,320 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 08:22:29,320 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2022-03-19 08:22:29,329 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:22:29 BoogieIcfgContainer [2022-03-19 08:22:29,329 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 08:22:29,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 08:22:29,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 08:22:29,346 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 08:22:29,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 08:22:28" (1/3) ... [2022-03-19 08:22:29,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69020c3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:22:29, skipping insertion in model container [2022-03-19 08:22:29,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:22:29" (2/3) ... [2022-03-19 08:22:29,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69020c3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:22:29, skipping insertion in model container [2022-03-19 08:22:29,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:22:29" (3/3) ... [2022-03-19 08:22:29,348 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de52.c [2022-03-19 08:22:29,352 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 08:22:29,352 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 08:22:29,401 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 08:22:29,420 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-19 08:22:29,421 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 08:22:29,448 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 08:22:29,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-19 08:22:29,453 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:29,453 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:29,454 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:29,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:29,457 INFO L85 PathProgramCache]: Analyzing trace with hash -1060076674, now seen corresponding path program 1 times [2022-03-19 08:22:29,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:29,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [350919922] [2022-03-19 08:22:29,471 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:22:29,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1060076674, now seen corresponding path program 2 times [2022-03-19 08:22:29,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:29,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824096236] [2022-03-19 08:22:29,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:29,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:29,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:29,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:29,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:29,651 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:29,651 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:29,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824096236] [2022-03-19 08:22:29,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824096236] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:29,652 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:29,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 08:22:29,655 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:29,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [350919922] [2022-03-19 08:22:29,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [350919922] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:29,656 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:29,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 08:22:29,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748338291] [2022-03-19 08:22:29,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:29,660 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 08:22:29,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:29,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 08:22:29,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 08:22:29,684 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 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 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:29,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:29,733 INFO L93 Difference]: Finished difference Result 41 states and 60 transitions. [2022-03-19 08:22:29,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 08:22:29,735 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-19 08:22:29,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:29,739 INFO L225 Difference]: With dead ends: 41 [2022-03-19 08:22:29,739 INFO L226 Difference]: Without dead ends: 17 [2022-03-19 08:22:29,741 INFO L911 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 [2022-03-19 08:22:29,744 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 19 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 30 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 [2022-03-19 08:22:29,744 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 30 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:22:29,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-19 08:22:29,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-19 08:22:29,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:29,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-03-19 08:22:29,769 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 16 [2022-03-19 08:22:29,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:29,770 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-03-19 08:22:29,770 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:29,770 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-03-19 08:22:29,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-19 08:22:29,771 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:29,771 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:29,772 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 08:22:29,772 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:29,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:29,773 INFO L85 PathProgramCache]: Analyzing trace with hash -1174593278, now seen corresponding path program 1 times [2022-03-19 08:22:29,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:29,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1663078329] [2022-03-19 08:22:29,775 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:22:29,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1174593278, now seen corresponding path program 2 times [2022-03-19 08:22:29,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:29,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307458676] [2022-03-19 08:22:29,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:29,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:29,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:29,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:29,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:29,876 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:29,877 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:29,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307458676] [2022-03-19 08:22:29,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307458676] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:29,878 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:29,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:22:29,878 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:29,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1663078329] [2022-03-19 08:22:29,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1663078329] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:29,879 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:29,879 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:22:29,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245374294] [2022-03-19 08:22:29,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:29,879 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:22:29,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:29,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:22:29,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:22:29,880 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:29,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:29,957 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2022-03-19 08:22:29,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 08:22:29,958 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-19 08:22:29,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:29,958 INFO L225 Difference]: With dead ends: 34 [2022-03-19 08:22:29,958 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 08:22:29,959 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:22:29,960 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 28 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:29,960 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 32 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:22:29,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 08:22:29,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-19 08:22:29,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:29,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2022-03-19 08:22:29,966 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 16 [2022-03-19 08:22:29,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:29,966 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2022-03-19 08:22:29,966 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:29,966 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2022-03-19 08:22:29,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 08:22:29,967 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:29,967 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:29,967 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-19 08:22:29,967 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:29,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:29,968 INFO L85 PathProgramCache]: Analyzing trace with hash -2018158143, now seen corresponding path program 1 times [2022-03-19 08:22:29,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:29,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1272064089] [2022-03-19 08:22:29,968 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-19 08:22:29,968 INFO L85 PathProgramCache]: Analyzing trace with hash -2018158143, now seen corresponding path program 2 times [2022-03-19 08:22:29,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:29,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317880792] [2022-03-19 08:22:29,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:29,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:29,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:30,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:30,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:30,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:30,022 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:30,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317880792] [2022-03-19 08:22:30,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317880792] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:30,023 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:30,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:22:30,023 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:30,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1272064089] [2022-03-19 08:22:30,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1272064089] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:30,023 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:30,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:22:30,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603521843] [2022-03-19 08:22:30,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:30,024 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 08:22:30,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:30,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 08:22:30,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 08:22:30,025 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:30,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:30,061 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2022-03-19 08:22:30,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 08:22:30,061 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-19 08:22:30,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:30,062 INFO L225 Difference]: With dead ends: 34 [2022-03-19 08:22:30,062 INFO L226 Difference]: Without dead ends: 27 [2022-03-19 08:22:30,062 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-19 08:22:30,063 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 21 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 26 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 [2022-03-19 08:22:30,063 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 26 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:22:30,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-19 08:22:30,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-19 08:22:30,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 22 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:30,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2022-03-19 08:22:30,070 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 17 [2022-03-19 08:22:30,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:30,070 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2022-03-19 08:22:30,070 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:30,070 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2022-03-19 08:22:30,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 08:22:30,070 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:30,071 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:30,071 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-19 08:22:30,071 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:30,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:30,071 INFO L85 PathProgramCache]: Analyzing trace with hash -615329744, now seen corresponding path program 1 times [2022-03-19 08:22:30,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:30,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1612269304] [2022-03-19 08:22:30,072 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-19 08:22:30,072 INFO L85 PathProgramCache]: Analyzing trace with hash -615329744, now seen corresponding path program 2 times [2022-03-19 08:22:30,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:30,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70519884] [2022-03-19 08:22:30,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:30,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:30,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:30,096 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:30,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:30,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:30,114 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:30,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70519884] [2022-03-19 08:22:30,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70519884] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:30,115 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:30,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:22:30,115 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:30,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1612269304] [2022-03-19 08:22:30,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1612269304] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:30,115 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:30,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:22:30,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985006821] [2022-03-19 08:22:30,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:30,116 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 08:22:30,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:30,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 08:22:30,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 08:22:30,117 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:30,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:30,145 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2022-03-19 08:22:30,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 08:22:30,145 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-19 08:22:30,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:30,146 INFO L225 Difference]: With dead ends: 43 [2022-03-19 08:22:30,146 INFO L226 Difference]: Without dead ends: 32 [2022-03-19 08:22:30,146 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-19 08:22:30,147 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 21 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:30,147 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 27 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:22:30,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-19 08:22:30,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-19 08:22:30,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:30,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 43 transitions. [2022-03-19 08:22:30,155 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 43 transitions. Word has length 17 [2022-03-19 08:22:30,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:30,155 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 43 transitions. [2022-03-19 08:22:30,156 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:30,156 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 43 transitions. [2022-03-19 08:22:30,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-19 08:22:30,156 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:30,156 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:30,156 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-19 08:22:30,156 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:30,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:30,157 INFO L85 PathProgramCache]: Analyzing trace with hash 669375650, now seen corresponding path program 1 times [2022-03-19 08:22:30,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:30,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1309351709] [2022-03-19 08:22:30,326 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:30,328 INFO L85 PathProgramCache]: Analyzing trace with hash 1460958083, now seen corresponding path program 1 times [2022-03-19 08:22:30,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:30,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832830290] [2022-03-19 08:22:30,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:30,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:30,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:30,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:30,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:30,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:30,483 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:30,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832830290] [2022-03-19 08:22:30,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832830290] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:30,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112411767] [2022-03-19 08:22:30,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:30,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:30,484 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:30,485 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:30,506 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 08:22:30,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:30,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:22:30,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:35,415 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:35,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 08:22:35,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112411767] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:35,416 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-19 08:22:35,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 10 [2022-03-19 08:22:35,506 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:35,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1309351709] [2022-03-19 08:22:35,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1309351709] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:35,507 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:35,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-19 08:22:35,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959584593] [2022-03-19 08:22:35,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:35,508 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-19 08:22:35,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:35,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-19 08:22:35,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-03-19 08:22:35,508 INFO L87 Difference]: Start difference. First operand 32 states and 43 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:35,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:35,581 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2022-03-19 08:22:35,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 08:22:35,583 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 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 18 [2022-03-19 08:22:35,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:35,584 INFO L225 Difference]: With dead ends: 42 [2022-03-19 08:22:35,584 INFO L226 Difference]: Without dead ends: 33 [2022-03-19 08:22:35,584 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2022-03-19 08:22:35,585 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 24 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:35,585 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 61 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 14 Invalid, 0 Unknown, 24 Unchecked, 0.0s Time] [2022-03-19 08:22:35,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-19 08:22:35,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-19 08:22:35,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:35,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2022-03-19 08:22:35,591 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 18 [2022-03-19 08:22:35,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:35,591 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2022-03-19 08:22:35,591 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:35,592 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2022-03-19 08:22:35,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 08:22:35,592 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:35,592 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:35,612 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-19 08:22:35,812 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 [2022-03-19 08:22:35,812 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:35,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:35,812 INFO L85 PathProgramCache]: Analyzing trace with hash 1840537200, now seen corresponding path program 2 times [2022-03-19 08:22:35,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:35,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [86670137] [2022-03-19 08:22:38,546 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:38,547 INFO L85 PathProgramCache]: Analyzing trace with hash 1747989443, now seen corresponding path program 1 times [2022-03-19 08:22:38,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:38,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911900590] [2022-03-19 08:22:38,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:38,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:38,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:38,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:38,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:38,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:38,646 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:38,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911900590] [2022-03-19 08:22:38,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1911900590] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:38,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994546431] [2022-03-19 08:22:38,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:38,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:38,647 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:38,648 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:38,663 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 08:22:38,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:38,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:22:38,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:44,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:44,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 08:22:44,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994546431] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:44,747 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-19 08:22:44,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 11 [2022-03-19 08:22:44,910 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:44,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [86670137] [2022-03-19 08:22:44,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [86670137] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:44,911 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:44,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:22:44,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142866805] [2022-03-19 08:22:44,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:44,911 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 08:22:44,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:44,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 08:22:44,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=136, Unknown=1, NotChecked=0, Total=182 [2022-03-19 08:22:44,912 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:44,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:44,938 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2022-03-19 08:22:44,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 08:22:44,938 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 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 19 [2022-03-19 08:22:44,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:44,938 INFO L225 Difference]: With dead ends: 41 [2022-03-19 08:22:44,938 INFO L226 Difference]: Without dead ends: 28 [2022-03-19 08:22:44,939 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=54, Invalid=155, Unknown=1, NotChecked=0, Total=210 [2022-03-19 08:22:44,939 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 3 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:44,940 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 79 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 35 Unchecked, 0.0s Time] [2022-03-19 08:22:44,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-19 08:22:44,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-19 08:22:44,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:44,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-03-19 08:22:44,944 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 19 [2022-03-19 08:22:44,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:44,944 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-03-19 08:22:44,944 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:44,944 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-03-19 08:22:44,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 08:22:44,945 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:44,945 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:44,966 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:45,159 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-03-19 08:22:45,160 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:45,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:45,160 INFO L85 PathProgramCache]: Analyzing trace with hash 735022287, now seen corresponding path program 1 times [2022-03-19 08:22:45,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:45,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [802622385] [2022-03-19 08:22:45,299 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:45,300 INFO L85 PathProgramCache]: Analyzing trace with hash 603383854, now seen corresponding path program 1 times [2022-03-19 08:22:45,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:45,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976235475] [2022-03-19 08:22:45,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:45,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:45,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:45,339 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:45,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:45,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:45,343 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:45,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976235475] [2022-03-19 08:22:45,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976235475] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:45,343 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:45,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:22:45,353 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:45,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [802622385] [2022-03-19 08:22:45,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [802622385] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:45,353 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:45,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:22:45,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245203625] [2022-03-19 08:22:45,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:45,354 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:22:45,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:45,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:22:45,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:22:45,356 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:45,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:45,415 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2022-03-19 08:22:45,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 08:22:45,416 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-19 08:22:45,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:45,417 INFO L225 Difference]: With dead ends: 35 [2022-03-19 08:22:45,417 INFO L226 Difference]: Without dead ends: 25 [2022-03-19 08:22:45,417 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:22:45,419 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 24 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:45,419 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 34 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:22:45,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-19 08:22:45,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-19 08:22:45,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:45,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2022-03-19 08:22:45,428 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 19 [2022-03-19 08:22:45,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:45,428 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2022-03-19 08:22:45,429 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:45,429 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2022-03-19 08:22:45,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 08:22:45,429 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:45,429 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:45,429 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-19 08:22:45,430 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:45,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:45,431 INFO L85 PathProgramCache]: Analyzing trace with hash -528072081, now seen corresponding path program 1 times [2022-03-19 08:22:45,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:45,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1109325651] [2022-03-19 08:22:45,587 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:45,588 INFO L85 PathProgramCache]: Analyzing trace with hash -988351090, now seen corresponding path program 1 times [2022-03-19 08:22:45,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:45,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797010987] [2022-03-19 08:22:45,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:45,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:45,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:45,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:45,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:45,643 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:45,644 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:45,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797010987] [2022-03-19 08:22:45,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797010987] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:45,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331226106] [2022-03-19 08:22:45,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:45,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:45,644 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:45,645 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:45,646 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 08:22:45,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:45,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-19 08:22:45,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:45,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:45,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:45,756 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:45,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331226106] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:45,757 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 08:22:45,757 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 6 [2022-03-19 08:22:45,766 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:45,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1109325651] [2022-03-19 08:22:45,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1109325651] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:45,766 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:45,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:22:45,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948251527] [2022-03-19 08:22:45,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:45,766 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 08:22:45,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:45,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 08:22:45,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-19 08:22:45,767 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:45,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:45,799 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2022-03-19 08:22:45,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 08:22:45,799 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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 19 [2022-03-19 08:22:45,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:45,800 INFO L225 Difference]: With dead ends: 30 [2022-03-19 08:22:45,800 INFO L226 Difference]: Without dead ends: 22 [2022-03-19 08:22:45,800 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-19 08:22:45,800 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:45,801 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 41 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:22:45,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-19 08:22:45,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-19 08:22:45,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:45,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-03-19 08:22:45,804 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 19 [2022-03-19 08:22:45,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:45,804 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-03-19 08:22:45,804 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:45,804 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-03-19 08:22:45,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-19 08:22:45,805 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:45,805 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:45,821 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:46,021 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:46,022 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:46,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:46,023 INFO L85 PathProgramCache]: Analyzing trace with hash 342490275, now seen corresponding path program 1 times [2022-03-19 08:22:46,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:46,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [153763970] [2022-03-19 08:22:46,159 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:46,160 INFO L85 PathProgramCache]: Analyzing trace with hash 1655786916, now seen corresponding path program 1 times [2022-03-19 08:22:46,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:46,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290000296] [2022-03-19 08:22:46,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:46,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:46,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:46,234 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:46,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:46,242 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:46,243 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:46,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290000296] [2022-03-19 08:22:46,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290000296] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:46,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810682778] [2022-03-19 08:22:46,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:46,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:46,243 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:46,244 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:46,255 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 08:22:46,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:46,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-19 08:22:46,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:46,330 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:22:46,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:46,380 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:22:46,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [810682778] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:46,381 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:46,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4] total 11 [2022-03-19 08:22:46,433 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:46,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [153763970] [2022-03-19 08:22:46,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [153763970] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:46,433 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:46,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:22:46,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647748495] [2022-03-19 08:22:46,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:46,433 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 08:22:46,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:46,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 08:22:46,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2022-03-19 08:22:46,434 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:46,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:46,640 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2022-03-19 08:22:46,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 08:22:46,641 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-19 08:22:46,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:46,642 INFO L225 Difference]: With dead ends: 35 [2022-03-19 08:22:46,642 INFO L226 Difference]: Without dead ends: 28 [2022-03-19 08:22:46,642 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:22:46,643 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 25 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:46,643 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 40 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:46,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-19 08:22:46,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2022-03-19 08:22:46,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:46,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-03-19 08:22:46,647 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 20 [2022-03-19 08:22:46,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:46,648 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-03-19 08:22:46,648 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:46,648 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-03-19 08:22:46,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-19 08:22:46,648 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:46,648 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:46,665 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:46,859 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:46,860 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:46,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:46,860 INFO L85 PathProgramCache]: Analyzing trace with hash 1745318674, now seen corresponding path program 1 times [2022-03-19 08:22:46,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:46,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [417355911] [2022-03-19 08:22:46,986 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:46,987 INFO L85 PathProgramCache]: Analyzing trace with hash 1460692051, now seen corresponding path program 1 times [2022-03-19 08:22:46,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:46,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343176408] [2022-03-19 08:22:46,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:46,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:47,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:47,046 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:47,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:47,051 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:47,051 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:47,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343176408] [2022-03-19 08:22:47,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343176408] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:47,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275979798] [2022-03-19 08:22:47,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:47,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:47,052 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:47,053 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:47,080 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 08:22:47,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:47,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 08:22:47,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:47,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:47,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:47,192 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:47,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275979798] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:47,193 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:47,193 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2022-03-19 08:22:47,204 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:47,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [417355911] [2022-03-19 08:22:47,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [417355911] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:47,204 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:47,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:22:47,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727404216] [2022-03-19 08:22:47,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:47,205 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:22:47,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:47,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:22:47,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:22:47,205 INFO L87 Difference]: Start difference. First operand 26 states and 33 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) [2022-03-19 08:22:47,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:47,303 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2022-03-19 08:22:47,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 08:22:47,303 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 [2022-03-19 08:22:47,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:47,304 INFO L225 Difference]: With dead ends: 39 [2022-03-19 08:22:47,304 INFO L226 Difference]: Without dead ends: 34 [2022-03-19 08:22:47,305 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:22:47,305 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:47,305 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 31 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:47,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-19 08:22:47,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2022-03-19 08:22:47,310 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) [2022-03-19 08:22:47,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2022-03-19 08:22:47,310 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 20 [2022-03-19 08:22:47,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:47,310 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2022-03-19 08:22:47,310 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) [2022-03-19 08:22:47,310 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2022-03-19 08:22:47,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 08:22:47,311 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:47,311 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:47,329 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:47,523 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-19 08:22:47,523 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:47,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:47,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1695200847, now seen corresponding path program 1 times [2022-03-19 08:22:47,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:47,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [53567633] [2022-03-19 08:22:47,623 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:47,623 INFO L85 PathProgramCache]: Analyzing trace with hash 75294800, now seen corresponding path program 1 times [2022-03-19 08:22:47,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:47,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878950878] [2022-03-19 08:22:47,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:47,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:47,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:47,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:47,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:47,745 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:47,745 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:47,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878950878] [2022-03-19 08:22:47,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878950878] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:47,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572081939] [2022-03-19 08:22:47,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:47,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:47,746 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:47,756 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:47,757 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 08:22:47,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:47,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-19 08:22:47,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:47,869 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:47,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:47,916 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:22:47,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572081939] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:47,916 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:47,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 6] total 12 [2022-03-19 08:22:47,936 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:47,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [53567633] [2022-03-19 08:22:47,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [53567633] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:47,937 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:47,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:22:47,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700752783] [2022-03-19 08:22:47,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:47,937 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:22:47,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:47,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:22:47,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2022-03-19 08:22:47,938 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:48,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:48,219 INFO L93 Difference]: Finished difference Result 59 states and 82 transitions. [2022-03-19 08:22:48,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 08:22:48,220 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-19 08:22:48,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:48,220 INFO L225 Difference]: With dead ends: 59 [2022-03-19 08:22:48,220 INFO L226 Difference]: Without dead ends: 40 [2022-03-19 08:22:48,220 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:22:48,221 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 38 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:48,221 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 55 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:48,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-19 08:22:48,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2022-03-19 08:22:48,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.4375) internal successors, (46), 32 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:48,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 50 transitions. [2022-03-19 08:22:48,228 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 50 transitions. Word has length 21 [2022-03-19 08:22:48,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:48,228 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 50 transitions. [2022-03-19 08:22:48,228 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:48,228 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 50 transitions. [2022-03-19 08:22:48,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 08:22:48,229 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:48,229 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:48,249 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-03-19 08:22:48,429 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:48,429 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:48,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:48,430 INFO L85 PathProgramCache]: Analyzing trace with hash -977123598, now seen corresponding path program 2 times [2022-03-19 08:22:48,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:48,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1436612713] [2022-03-19 08:22:48,568 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:48,568 INFO L85 PathProgramCache]: Analyzing trace with hash 67701875, now seen corresponding path program 1 times [2022-03-19 08:22:48,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:48,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536841445] [2022-03-19 08:22:48,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:48,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:48,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:48,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:48,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:48,624 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:22:48,625 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:48,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536841445] [2022-03-19 08:22:48,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536841445] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:48,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855102038] [2022-03-19 08:22:48,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:48,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:48,625 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:48,632 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:48,660 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 08:22:48,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:48,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:22:48,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:48,724 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:48,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:48,813 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:48,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855102038] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:48,813 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:48,814 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 11 [2022-03-19 08:22:48,829 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:48,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1436612713] [2022-03-19 08:22:48,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1436612713] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:48,829 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:48,830 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:22:48,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347318022] [2022-03-19 08:22:48,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:48,830 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:22:48,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:48,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:22:48,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-19 08:22:48,830 INFO L87 Difference]: Start difference. First operand 37 states and 50 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) [2022-03-19 08:22:48,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:48,933 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-03-19 08:22:48,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 08:22:48,934 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 [2022-03-19 08:22:48,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:48,934 INFO L225 Difference]: With dead ends: 46 [2022-03-19 08:22:48,934 INFO L226 Difference]: Without dead ends: 38 [2022-03-19 08:22:48,934 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:22:48,935 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:48,935 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 32 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:22:48,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-19 08:22:48,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-19 08:22:48,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.393939393939394) internal successors, (46), 33 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:48,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 50 transitions. [2022-03-19 08:22:48,942 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 50 transitions. Word has length 22 [2022-03-19 08:22:48,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:48,942 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 50 transitions. [2022-03-19 08:22:48,942 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) [2022-03-19 08:22:48,942 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 50 transitions. [2022-03-19 08:22:48,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 08:22:48,942 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:48,942 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:48,970 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:49,159 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:49,159 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:49,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:49,160 INFO L85 PathProgramCache]: Analyzing trace with hash -439116189, now seen corresponding path program 3 times [2022-03-19 08:22:49,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:49,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1951046697] [2022-03-19 08:22:49,287 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:49,287 INFO L85 PathProgramCache]: Analyzing trace with hash -1695222748, now seen corresponding path program 1 times [2022-03-19 08:22:49,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:49,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805484032] [2022-03-19 08:22:49,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:49,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:49,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,332 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:49,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,338 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:22:49,339 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:49,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805484032] [2022-03-19 08:22:49,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805484032] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:49,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867045423] [2022-03-19 08:22:49,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:49,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:49,339 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:49,340 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:49,355 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-19 08:22:49,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 08:22:49,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:49,427 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:22:49,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:49,466 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:22:49,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867045423] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:49,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:49,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2022-03-19 08:22:49,487 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:49,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1951046697] [2022-03-19 08:22:49,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1951046697] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:49,487 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:49,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:22:49,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716069084] [2022-03-19 08:22:49,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:49,488 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:22:49,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:49,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:22:49,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:22:49,488 INFO L87 Difference]: Start difference. First operand 38 states and 50 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) [2022-03-19 08:22:49,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:49,587 INFO L93 Difference]: Finished difference Result 53 states and 70 transitions. [2022-03-19 08:22:49,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 08:22:49,587 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 [2022-03-19 08:22:49,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:49,587 INFO L225 Difference]: With dead ends: 53 [2022-03-19 08:22:49,587 INFO L226 Difference]: Without dead ends: 38 [2022-03-19 08:22:49,588 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:22:49,588 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 35 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:49,588 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 29 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:49,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-19 08:22:49,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2022-03-19 08:22:49,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:49,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-03-19 08:22:49,594 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 22 [2022-03-19 08:22:49,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:49,594 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-03-19 08:22:49,594 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) [2022-03-19 08:22:49,594 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-03-19 08:22:49,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 08:22:49,595 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:49,595 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:49,614 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:49,811 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-19 08:22:49,812 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:49,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:49,812 INFO L85 PathProgramCache]: Analyzing trace with hash 1891906146, now seen corresponding path program 2 times [2022-03-19 08:22:49,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:49,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [721560619] [2022-03-19 08:22:49,914 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:49,915 INFO L85 PathProgramCache]: Analyzing trace with hash 251419950, now seen corresponding path program 1 times [2022-03-19 08:22:49,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:49,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296907360] [2022-03-19 08:22:49,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:49,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:49,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:49,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,967 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:49,967 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:49,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296907360] [2022-03-19 08:22:49,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296907360] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:49,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557445929] [2022-03-19 08:22:49,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:49,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:49,968 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:49,969 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:49,970 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-19 08:22:49,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:49,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 08:22:49,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:50,048 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:50,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:50,124 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:50,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557445929] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:50,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:50,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-19 08:22:50,153 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:50,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [721560619] [2022-03-19 08:22:50,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [721560619] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:50,154 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:50,154 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:22:50,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992294338] [2022-03-19 08:22:50,154 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:50,154 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 08:22:50,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:50,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 08:22:50,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:22:50,155 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:50,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:50,393 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2022-03-19 08:22:50,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-19 08:22:50,393 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-19 08:22:50,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:50,394 INFO L225 Difference]: With dead ends: 40 [2022-03-19 08:22:50,394 INFO L226 Difference]: Without dead ends: 30 [2022-03-19 08:22:50,394 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 45 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2022-03-19 08:22:50,395 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 25 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:50,395 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 48 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:50,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-19 08:22:50,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2022-03-19 08:22:50,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:50,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2022-03-19 08:22:50,400 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 22 [2022-03-19 08:22:50,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:50,400 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2022-03-19 08:22:50,400 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:50,400 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2022-03-19 08:22:50,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 08:22:50,400 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:50,400 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:50,417 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:50,617 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-19 08:22:50,617 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:50,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:50,618 INFO L85 PathProgramCache]: Analyzing trace with hash -1409588607, now seen corresponding path program 3 times [2022-03-19 08:22:50,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:50,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1560558942] [2022-03-19 08:22:50,739 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:50,740 INFO L85 PathProgramCache]: Analyzing trace with hash 1268982133, now seen corresponding path program 1 times [2022-03-19 08:22:50,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:50,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151560047] [2022-03-19 08:22:50,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:50,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:50,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:50,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:50,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:50,800 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 08:22:50,800 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:50,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151560047] [2022-03-19 08:22:50,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151560047] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:50,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745080922] [2022-03-19 08:22:50,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:50,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:50,800 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:50,801 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:50,805 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-19 08:22:50,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:50,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-19 08:22:50,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:50,898 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:50,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:50,933 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:50,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745080922] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:50,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:50,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 9 [2022-03-19 08:22:50,967 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:50,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1560558942] [2022-03-19 08:22:50,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1560558942] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:50,968 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:50,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:22:50,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554809162] [2022-03-19 08:22:50,968 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:50,968 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:22:50,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:50,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:22:50,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:22:50,969 INFO L87 Difference]: Start difference. First operand 27 states and 34 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) [2022-03-19 08:22:51,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:51,139 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2022-03-19 08:22:51,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-19 08:22:51,140 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 23 [2022-03-19 08:22:51,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:51,140 INFO L225 Difference]: With dead ends: 50 [2022-03-19 08:22:51,140 INFO L226 Difference]: Without dead ends: 43 [2022-03-19 08:22:51,140 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:22:51,141 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 51 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:51,141 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 29 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:51,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-19 08:22:51,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2022-03-19 08:22:51,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:51,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2022-03-19 08:22:51,147 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 23 [2022-03-19 08:22:51,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:51,147 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2022-03-19 08:22:51,147 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) [2022-03-19 08:22:51,147 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2022-03-19 08:22:51,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 08:22:51,148 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:51,148 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:51,165 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:51,364 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-19 08:22:51,365 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:51,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:51,365 INFO L85 PathProgramCache]: Analyzing trace with hash -6760208, now seen corresponding path program 2 times [2022-03-19 08:22:51,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:51,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [342886963] [2022-03-19 08:22:51,488 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:51,489 INFO L85 PathProgramCache]: Analyzing trace with hash 370878500, now seen corresponding path program 1 times [2022-03-19 08:22:51,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:51,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642297489] [2022-03-19 08:22:51,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:51,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:51,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:51,569 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:51,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:51,572 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:51,572 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:51,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642297489] [2022-03-19 08:22:51,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642297489] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:51,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056225601] [2022-03-19 08:22:51,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:51,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:51,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:51,575 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:51,576 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-19 08:22:51,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:51,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-19 08:22:51,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:51,712 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:51,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:51,746 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:51,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056225601] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:51,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:51,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 11 [2022-03-19 08:22:51,881 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:51,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [342886963] [2022-03-19 08:22:51,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [342886963] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:51,881 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:51,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:22:51,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001206062] [2022-03-19 08:22:51,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:51,882 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 08:22:51,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:51,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 08:22:51,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:22:51,882 INFO L87 Difference]: Start difference. First operand 34 states and 45 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:52,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:52,234 INFO L93 Difference]: Finished difference Result 51 states and 66 transitions. [2022-03-19 08:22:52,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-19 08:22:52,234 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 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 [2022-03-19 08:22:52,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:52,235 INFO L225 Difference]: With dead ends: 51 [2022-03-19 08:22:52,235 INFO L226 Difference]: Without dead ends: 43 [2022-03-19 08:22:52,236 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:22:52,236 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 32 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:52,237 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 35 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:52,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-19 08:22:52,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2022-03-19 08:22:52,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 34 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) [2022-03-19 08:22:52,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 51 transitions. [2022-03-19 08:22:52,255 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 51 transitions. Word has length 23 [2022-03-19 08:22:52,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:52,255 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 51 transitions. [2022-03-19 08:22:52,255 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:52,255 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 51 transitions. [2022-03-19 08:22:52,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-19 08:22:52,256 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:52,256 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:52,272 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-19 08:22:52,456 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-19 08:22:52,456 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:52,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:52,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1227757058, now seen corresponding path program 3 times [2022-03-19 08:22:52,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:52,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [155715068] [2022-03-19 08:22:52,574 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:52,575 INFO L85 PathProgramCache]: Analyzing trace with hash 1735206158, now seen corresponding path program 1 times [2022-03-19 08:22:52,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:52,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235009137] [2022-03-19 08:22:52,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:52,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:52,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:52,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:52,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:52,625 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:52,625 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:52,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235009137] [2022-03-19 08:22:52,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235009137] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:52,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551701066] [2022-03-19 08:22:52,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:52,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:52,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:52,627 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:52,649 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-19 08:22:52,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:52,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:22:52,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:52,789 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:52,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:52,856 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:52,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551701066] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:52,856 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:52,856 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 5] total 15 [2022-03-19 08:22:52,896 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:52,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [155715068] [2022-03-19 08:22:52,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [155715068] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:52,897 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:52,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:22:52,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981999610] [2022-03-19 08:22:52,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:52,897 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 08:22:52,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:52,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 08:22:52,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:22:52,898 INFO L87 Difference]: Start difference. First operand 39 states and 51 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:53,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:53,171 INFO L93 Difference]: Finished difference Result 61 states and 83 transitions. [2022-03-19 08:22:53,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 08:22:53,171 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 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 24 [2022-03-19 08:22:53,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:53,172 INFO L225 Difference]: With dead ends: 61 [2022-03-19 08:22:53,172 INFO L226 Difference]: Without dead ends: 56 [2022-03-19 08:22:53,172 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=626, Unknown=0, NotChecked=0, Total=756 [2022-03-19 08:22:53,172 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 36 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:53,173 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 32 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:53,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-19 08:22:53,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2022-03-19 08:22:53,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:53,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 62 transitions. [2022-03-19 08:22:53,189 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 62 transitions. Word has length 24 [2022-03-19 08:22:53,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:53,189 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 62 transitions. [2022-03-19 08:22:53,189 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:53,189 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 62 transitions. [2022-03-19 08:22:53,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-19 08:22:53,190 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:53,190 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:53,207 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:53,392 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-19 08:22:53,392 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:53,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:53,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1822836127, now seen corresponding path program 4 times [2022-03-19 08:22:53,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:53,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [297053943] [2022-03-19 08:22:53,505 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:53,506 INFO L85 PathProgramCache]: Analyzing trace with hash 1735658773, now seen corresponding path program 1 times [2022-03-19 08:22:53,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:53,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72744582] [2022-03-19 08:22:53,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:53,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:53,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:53,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:53,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:53,631 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:53,631 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:53,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72744582] [2022-03-19 08:22:53,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72744582] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:53,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339596004] [2022-03-19 08:22:53,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:53,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:53,632 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:53,633 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:53,634 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-19 08:22:53,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:53,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:22:53,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:53,776 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:53,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:53,913 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:53,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1339596004] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:53,913 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:53,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2022-03-19 08:22:53,956 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:53,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [297053943] [2022-03-19 08:22:53,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [297053943] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:53,956 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:53,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:22:53,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038586983] [2022-03-19 08:22:53,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:53,956 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:22:53,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:53,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:22:53,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-03-19 08:22:53,957 INFO L87 Difference]: Start difference. First operand 46 states and 62 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:54,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:54,300 INFO L93 Difference]: Finished difference Result 66 states and 87 transitions. [2022-03-19 08:22:54,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 08:22:54,301 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 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 [2022-03-19 08:22:54,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:54,301 INFO L225 Difference]: With dead ends: 66 [2022-03-19 08:22:54,301 INFO L226 Difference]: Without dead ends: 56 [2022-03-19 08:22:54,302 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=496, Unknown=0, NotChecked=0, Total=600 [2022-03-19 08:22:54,302 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 27 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:54,302 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 58 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:22:54,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-19 08:22:54,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 49. [2022-03-19 08:22:54,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 44 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) [2022-03-19 08:22:54,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 65 transitions. [2022-03-19 08:22:54,313 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 65 transitions. Word has length 25 [2022-03-19 08:22:54,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:54,313 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 65 transitions. [2022-03-19 08:22:54,313 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:54,313 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 65 transitions. [2022-03-19 08:22:54,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-19 08:22:54,313 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:54,313 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:54,341 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-03-19 08:22:54,541 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-19 08:22:54,542 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:54,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:54,542 INFO L85 PathProgramCache]: Analyzing trace with hash -137630238, now seen corresponding path program 4 times [2022-03-19 08:22:54,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:54,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1146898554] [2022-03-19 08:22:54,632 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:54,632 INFO L85 PathProgramCache]: Analyzing trace with hash -881559186, now seen corresponding path program 1 times [2022-03-19 08:22:54,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:54,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424719456] [2022-03-19 08:22:54,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:54,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:54,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:54,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:54,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:54,745 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:54,746 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:54,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424719456] [2022-03-19 08:22:54,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424719456] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:54,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91591399] [2022-03-19 08:22:54,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:54,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:54,746 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:54,752 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:54,752 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-19 08:22:54,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:54,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:22:54,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:54,875 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:54,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:54,929 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:22:54,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91591399] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:54,930 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:54,930 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 7] total 14 [2022-03-19 08:22:54,969 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:54,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1146898554] [2022-03-19 08:22:54,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1146898554] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:54,970 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:54,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:22:54,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216855817] [2022-03-19 08:22:54,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:54,970 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:22:54,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:54,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:22:54,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2022-03-19 08:22:54,971 INFO L87 Difference]: Start difference. First operand 49 states and 65 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:55,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:55,421 INFO L93 Difference]: Finished difference Result 105 states and 144 transitions. [2022-03-19 08:22:55,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-19 08:22:55,421 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-19 08:22:55,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:55,422 INFO L225 Difference]: With dead ends: 105 [2022-03-19 08:22:55,422 INFO L226 Difference]: Without dead ends: 69 [2022-03-19 08:22:55,422 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 54 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=127, Invalid=803, Unknown=0, NotChecked=0, Total=930 [2022-03-19 08:22:55,423 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 52 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:55,423 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 62 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:22:55,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-19 08:22:55,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2022-03-19 08:22:55,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.4107142857142858) internal successors, (79), 56 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:55,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 83 transitions. [2022-03-19 08:22:55,443 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 83 transitions. Word has length 26 [2022-03-19 08:22:55,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:55,444 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 83 transitions. [2022-03-19 08:22:55,444 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:55,444 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 83 transitions. [2022-03-19 08:22:55,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 08:22:55,444 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:55,444 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:55,461 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:55,650 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:55,650 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:55,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:55,651 INFO L85 PathProgramCache]: Analyzing trace with hash 62925025, now seen corresponding path program 5 times [2022-03-19 08:22:55,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:55,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [491847003] [2022-03-19 08:22:55,730 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:55,730 INFO L85 PathProgramCache]: Analyzing trace with hash 264339221, now seen corresponding path program 1 times [2022-03-19 08:22:55,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:55,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073013104] [2022-03-19 08:22:55,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:55,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:55,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:55,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:55,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:55,798 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:22:55,799 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:55,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073013104] [2022-03-19 08:22:55,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073013104] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:55,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097361509] [2022-03-19 08:22:55,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:55,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:55,799 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:55,800 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:55,801 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-19 08:22:55,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:55,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:22:55,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:55,911 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:55,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:56,062 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:56,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1097361509] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:56,063 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:56,063 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 10] total 15 [2022-03-19 08:22:56,109 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:56,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [491847003] [2022-03-19 08:22:56,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [491847003] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:56,109 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:56,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:22:56,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273370633] [2022-03-19 08:22:56,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:56,110 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:22:56,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:56,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:22:56,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:22:56,110 INFO L87 Difference]: Start difference. First operand 61 states and 83 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:56,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:56,363 INFO L93 Difference]: Finished difference Result 71 states and 94 transitions. [2022-03-19 08:22:56,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-19 08:22:56,363 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 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 27 [2022-03-19 08:22:56,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:56,363 INFO L225 Difference]: With dead ends: 71 [2022-03-19 08:22:56,364 INFO L226 Difference]: Without dead ends: 62 [2022-03-19 08:22:56,364 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=539, Unknown=0, NotChecked=0, Total=650 [2022-03-19 08:22:56,366 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 40 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:56,367 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 37 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:56,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-03-19 08:22:56,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-03-19 08:22:56,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.3859649122807018) internal successors, (79), 57 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:56,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 83 transitions. [2022-03-19 08:22:56,396 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 83 transitions. Word has length 27 [2022-03-19 08:22:56,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:56,396 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 83 transitions. [2022-03-19 08:22:56,396 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:56,397 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 83 transitions. [2022-03-19 08:22:56,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 08:22:56,398 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:56,398 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:56,414 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:56,604 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:56,604 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:56,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:56,605 INFO L85 PathProgramCache]: Analyzing trace with hash -438714480, now seen corresponding path program 6 times [2022-03-19 08:22:56,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:56,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [69685734] [2022-03-19 08:22:56,794 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:56,795 INFO L85 PathProgramCache]: Analyzing trace with hash 1551074820, now seen corresponding path program 1 times [2022-03-19 08:22:56,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:56,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650802097] [2022-03-19 08:22:56,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:56,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:56,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:56,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:56,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:56,873 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:22:56,873 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:56,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650802097] [2022-03-19 08:22:56,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650802097] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:56,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256453025] [2022-03-19 08:22:56,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:56,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:56,874 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:56,875 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:56,876 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-19 08:22:56,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:56,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:22:56,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:56,953 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:22:56,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:56,998 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:22:56,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256453025] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:56,998 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:56,998 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 6 [2022-03-19 08:22:57,030 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:57,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [69685734] [2022-03-19 08:22:57,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [69685734] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:57,031 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:57,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:22:57,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164673599] [2022-03-19 08:22:57,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:57,032 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:22:57,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:57,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:22:57,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-03-19 08:22:57,033 INFO L87 Difference]: Start difference. First operand 62 states and 83 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:57,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:57,184 INFO L93 Difference]: Finished difference Result 76 states and 99 transitions. [2022-03-19 08:22:57,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 08:22:57,185 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 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 27 [2022-03-19 08:22:57,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:57,185 INFO L225 Difference]: With dead ends: 76 [2022-03-19 08:22:57,185 INFO L226 Difference]: Without dead ends: 57 [2022-03-19 08:22:57,186 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2022-03-19 08:22:57,186 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 41 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:57,186 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 34 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:22:57,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-19 08:22:57,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2022-03-19 08:22:57,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.4) internal successors, (70), 50 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:57,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 74 transitions. [2022-03-19 08:22:57,201 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 74 transitions. Word has length 27 [2022-03-19 08:22:57,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:57,201 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 74 transitions. [2022-03-19 08:22:57,202 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:57,202 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 74 transitions. [2022-03-19 08:22:57,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 08:22:57,202 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:57,202 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:57,219 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:57,422 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:57,422 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:57,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:57,423 INFO L85 PathProgramCache]: Analyzing trace with hash 149891424, now seen corresponding path program 5 times [2022-03-19 08:22:57,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:57,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2113964235] [2022-03-19 08:22:57,548 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:57,549 INFO L85 PathProgramCache]: Analyzing trace with hash 1992885087, now seen corresponding path program 1 times [2022-03-19 08:22:57,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:57,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206243152] [2022-03-19 08:22:57,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:57,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:57,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:57,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:57,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:57,716 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:22:57,716 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:57,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206243152] [2022-03-19 08:22:57,716 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206243152] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:57,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966977618] [2022-03-19 08:22:57,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:57,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:57,716 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:57,717 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:57,719 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-19 08:22:57,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:57,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:22:57,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:58,020 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:58,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:58,124 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:22:58,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966977618] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:58,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:58,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 6] total 20 [2022-03-19 08:22:58,327 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:58,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2113964235] [2022-03-19 08:22:58,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2113964235] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:58,328 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:58,328 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 08:22:58,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896549758] [2022-03-19 08:22:58,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:58,328 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 08:22:58,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:58,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 08:22:58,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=488, Unknown=0, NotChecked=0, Total=552 [2022-03-19 08:22:58,329 INFO L87 Difference]: Start difference. First operand 55 states and 74 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:59,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:59,195 INFO L93 Difference]: Finished difference Result 68 states and 92 transitions. [2022-03-19 08:22:59,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-19 08:22:59,196 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 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 27 [2022-03-19 08:22:59,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:59,196 INFO L225 Difference]: With dead ends: 68 [2022-03-19 08:22:59,196 INFO L226 Difference]: Without dead ends: 59 [2022-03-19 08:22:59,197 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=182, Invalid=1224, Unknown=0, NotChecked=0, Total=1406 [2022-03-19 08:22:59,197 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 36 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:59,197 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 40 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:22:59,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-19 08:22:59,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2022-03-19 08:22:59,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 52 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:59,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 77 transitions. [2022-03-19 08:22:59,211 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 77 transitions. Word has length 27 [2022-03-19 08:22:59,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:59,211 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 77 transitions. [2022-03-19 08:22:59,211 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:59,211 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 77 transitions. [2022-03-19 08:22:59,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 08:22:59,211 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:59,212 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:59,228 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:59,420 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:59,420 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:59,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:59,420 INFO L85 PathProgramCache]: Analyzing trace with hash 1678337854, now seen corresponding path program 6 times [2022-03-19 08:22:59,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:59,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1669331436] [2022-03-19 08:22:59,540 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:59,541 INFO L85 PathProgramCache]: Analyzing trace with hash -161756931, now seen corresponding path program 1 times [2022-03-19 08:22:59,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:59,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [163727581] [2022-03-19 08:22:59,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:59,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:59,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:59,681 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:59,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:59,683 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:59,684 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:59,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [163727581] [2022-03-19 08:22:59,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [163727581] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:59,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781805898] [2022-03-19 08:22:59,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:59,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:59,684 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:59,696 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:59,698 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-19 08:22:59,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:59,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-19 08:22:59,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:59,835 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:22:59,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:00,009 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:00,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781805898] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:00,009 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:00,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2022-03-19 08:23:00,101 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:00,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1669331436] [2022-03-19 08:23:00,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1669331436] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:00,101 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:00,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:23:00,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804106576] [2022-03-19 08:23:00,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:00,101 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:23:00,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:00,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:23:00,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:23:00,102 INFO L87 Difference]: Start difference. First operand 57 states and 77 transitions. Second operand has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:01,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:01,307 INFO L93 Difference]: Finished difference Result 87 states and 120 transitions. [2022-03-19 08:23:01,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-19 08:23:01,307 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-19 08:23:01,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:01,308 INFO L225 Difference]: With dead ends: 87 [2022-03-19 08:23:01,308 INFO L226 Difference]: Without dead ends: 61 [2022-03-19 08:23:01,308 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 52 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2022-03-19 08:23:01,309 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:01,309 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 68 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:23:01,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-19 08:23:01,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2022-03-19 08:23:01,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:01,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 63 transitions. [2022-03-19 08:23:01,324 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 63 transitions. Word has length 27 [2022-03-19 08:23:01,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:01,325 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 63 transitions. [2022-03-19 08:23:01,325 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:01,325 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 63 transitions. [2022-03-19 08:23:01,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-19 08:23:01,325 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:01,325 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:01,349 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:01,542 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:01,542 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:01,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:01,542 INFO L85 PathProgramCache]: Analyzing trace with hash 1788990354, now seen corresponding path program 7 times [2022-03-19 08:23:01,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:01,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [773906595] [2022-03-19 08:23:01,658 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:01,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1925965325, now seen corresponding path program 1 times [2022-03-19 08:23:01,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:01,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206464008] [2022-03-19 08:23:01,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:01,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:01,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:01,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:01,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:01,751 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:23:01,751 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:01,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206464008] [2022-03-19 08:23:01,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206464008] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:01,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739237799] [2022-03-19 08:23:01,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:01,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:01,751 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:01,752 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:01,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-19 08:23:01,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:01,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-19 08:23:01,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:01,942 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:23:01,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:02,000 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:23:02,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739237799] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:02,001 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:02,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 12 [2022-03-19 08:23:02,069 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:02,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [773906595] [2022-03-19 08:23:02,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [773906595] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:02,069 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:02,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 08:23:02,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849421207] [2022-03-19 08:23:02,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:02,070 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 08:23:02,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:02,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 08:23:02,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-03-19 08:23:02,070 INFO L87 Difference]: Start difference. First operand 49 states and 63 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) [2022-03-19 08:23:02,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:02,678 INFO L93 Difference]: Finished difference Result 68 states and 90 transitions. [2022-03-19 08:23:02,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-19 08:23:02,678 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 28 [2022-03-19 08:23:02,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:02,678 INFO L225 Difference]: With dead ends: 68 [2022-03-19 08:23:02,679 INFO L226 Difference]: Without dead ends: 63 [2022-03-19 08:23:02,679 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=216, Invalid=776, Unknown=0, NotChecked=0, Total=992 [2022-03-19 08:23:02,679 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 24 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:02,680 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 57 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:23:02,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-19 08:23:02,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2022-03-19 08:23:02,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.3333333333333333) internal successors, (68), 51 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:02,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 72 transitions. [2022-03-19 08:23:02,694 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 72 transitions. Word has length 28 [2022-03-19 08:23:02,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:02,694 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 72 transitions. [2022-03-19 08:23:02,694 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) [2022-03-19 08:23:02,694 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 72 transitions. [2022-03-19 08:23:02,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-19 08:23:02,694 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:02,694 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:02,713 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:02,911 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:02,912 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:02,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:02,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1424549923, now seen corresponding path program 8 times [2022-03-19 08:23:02,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:02,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1209996779] [2022-03-19 08:23:03,003 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:03,003 INFO L85 PathProgramCache]: Analyzing trace with hash -502030652, now seen corresponding path program 1 times [2022-03-19 08:23:03,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:03,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173434063] [2022-03-19 08:23:03,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:03,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:03,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:03,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:03,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:03,103 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:23:03,104 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:03,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173434063] [2022-03-19 08:23:03,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173434063] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:03,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344293758] [2022-03-19 08:23:03,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:03,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:03,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:03,105 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:03,112 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-19 08:23:03,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:03,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-19 08:23:03,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:03,363 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:03,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:03,570 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:03,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344293758] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:03,570 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:03,570 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 7] total 22 [2022-03-19 08:23:03,723 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:03,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1209996779] [2022-03-19 08:23:03,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1209996779] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:03,724 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:03,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 08:23:03,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509426061] [2022-03-19 08:23:03,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:03,724 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 08:23:03,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:03,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 08:23:03,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2022-03-19 08:23:03,725 INFO L87 Difference]: Start difference. First operand 56 states and 72 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:04,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:04,378 INFO L93 Difference]: Finished difference Result 102 states and 138 transitions. [2022-03-19 08:23:04,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 08:23:04,378 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 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 [2022-03-19 08:23:04,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:04,379 INFO L225 Difference]: With dead ends: 102 [2022-03-19 08:23:04,379 INFO L226 Difference]: Without dead ends: 90 [2022-03-19 08:23:04,379 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=187, Invalid=1145, Unknown=0, NotChecked=0, Total=1332 [2022-03-19 08:23:04,380 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 88 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:04,380 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 37 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:23:04,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-03-19 08:23:04,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 66. [2022-03-19 08:23:04,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.3278688524590163) internal successors, (81), 61 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) [2022-03-19 08:23:04,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 85 transitions. [2022-03-19 08:23:04,403 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 85 transitions. Word has length 28 [2022-03-19 08:23:04,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:04,403 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 85 transitions. [2022-03-19 08:23:04,403 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:04,403 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 85 transitions. [2022-03-19 08:23:04,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-19 08:23:04,403 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:04,403 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:04,422 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:04,615 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-03-19 08:23:04,615 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:04,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:04,615 INFO L85 PathProgramCache]: Analyzing trace with hash 22222479, now seen corresponding path program 9 times [2022-03-19 08:23:04,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:04,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1422824497] [2022-03-19 08:23:04,759 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:04,760 INFO L85 PathProgramCache]: Analyzing trace with hash 32820174, now seen corresponding path program 1 times [2022-03-19 08:23:04,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:04,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398457357] [2022-03-19 08:23:04,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:04,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:04,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:04,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:04,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:04,882 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:23:04,883 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:04,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398457357] [2022-03-19 08:23:04,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398457357] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:04,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672793711] [2022-03-19 08:23:04,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:04,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:04,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:04,884 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:04,885 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-19 08:23:04,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:04,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:23:04,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:05,014 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:23:05,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:05,257 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:23:05,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672793711] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:05,257 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:05,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2022-03-19 08:23:05,410 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:05,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1422824497] [2022-03-19 08:23:05,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1422824497] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:05,411 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:05,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:23:05,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107097568] [2022-03-19 08:23:05,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:05,411 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:23:05,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:05,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:23:05,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:23:05,412 INFO L87 Difference]: Start difference. First operand 66 states and 85 transitions. Second operand has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:06,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:06,077 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2022-03-19 08:23:06,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-19 08:23:06,078 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 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 [2022-03-19 08:23:06,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:06,078 INFO L225 Difference]: With dead ends: 79 [2022-03-19 08:23:06,078 INFO L226 Difference]: Without dead ends: 68 [2022-03-19 08:23:06,079 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2022-03-19 08:23:06,079 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 42 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:06,080 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 68 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:23:06,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-19 08:23:06,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 65. [2022-03-19 08:23:06,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.3) internal successors, (78), 60 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:06,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 82 transitions. [2022-03-19 08:23:06,104 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 82 transitions. Word has length 29 [2022-03-19 08:23:06,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:06,104 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 82 transitions. [2022-03-19 08:23:06,105 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:06,105 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 82 transitions. [2022-03-19 08:23:06,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-19 08:23:06,105 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:06,105 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:06,122 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:06,319 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-19 08:23:06,320 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:06,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:06,320 INFO L85 PathProgramCache]: Analyzing trace with hash 655213199, now seen corresponding path program 10 times [2022-03-19 08:23:06,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:06,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [854461114] [2022-03-19 08:23:06,430 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:06,430 INFO L85 PathProgramCache]: Analyzing trace with hash 270864270, now seen corresponding path program 1 times [2022-03-19 08:23:06,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:06,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833574232] [2022-03-19 08:23:06,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:06,431 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:06,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:06,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:06,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:06,676 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:06,676 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:06,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833574232] [2022-03-19 08:23:06,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833574232] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:06,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201471164] [2022-03-19 08:23:06,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:06,677 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:06,677 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:06,678 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:06,679 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-19 08:23:06,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:06,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:23:06,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:06,806 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:06,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:07,019 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:07,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201471164] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:07,019 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:07,020 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2022-03-19 08:23:07,147 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:07,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [854461114] [2022-03-19 08:23:07,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [854461114] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:07,148 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:07,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 08:23:07,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056435098] [2022-03-19 08:23:07,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:07,148 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 08:23:07,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:07,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 08:23:07,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=368, Unknown=0, NotChecked=0, Total=420 [2022-03-19 08:23:07,149 INFO L87 Difference]: Start difference. First operand 65 states and 82 transitions. Second operand has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:10,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:10,676 INFO L93 Difference]: Finished difference Result 122 states and 161 transitions. [2022-03-19 08:23:10,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-19 08:23:10,677 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-19 08:23:10,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:10,678 INFO L225 Difference]: With dead ends: 122 [2022-03-19 08:23:10,678 INFO L226 Difference]: Without dead ends: 98 [2022-03-19 08:23:10,679 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=553, Invalid=2869, Unknown=0, NotChecked=0, Total=3422 [2022-03-19 08:23:10,679 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 91 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:10,679 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 83 Invalid, 640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-19 08:23:10,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-03-19 08:23:10,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 74. [2022-03-19 08:23:10,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.289855072463768) internal successors, (89), 69 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:10,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 93 transitions. [2022-03-19 08:23:10,699 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 93 transitions. Word has length 29 [2022-03-19 08:23:10,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:10,700 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 93 transitions. [2022-03-19 08:23:10,700 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:10,700 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 93 transitions. [2022-03-19 08:23:10,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-19 08:23:10,700 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:10,700 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:10,717 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-19 08:23:10,911 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-19 08:23:10,911 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:10,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:10,913 INFO L85 PathProgramCache]: Analyzing trace with hash -227543310, now seen corresponding path program 11 times [2022-03-19 08:23:10,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:10,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [414453189] [2022-03-19 08:23:11,065 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:11,065 INFO L85 PathProgramCache]: Analyzing trace with hash 1384098323, now seen corresponding path program 1 times [2022-03-19 08:23:11,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:11,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008021] [2022-03-19 08:23:11,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:11,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:11,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:11,268 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:11,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:11,284 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:23:11,284 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:11,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008021] [2022-03-19 08:23:11,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008021] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:11,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444511781] [2022-03-19 08:23:11,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:11,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:11,285 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:11,286 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:11,286 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-19 08:23:11,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:11,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:23:11,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:11,491 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:11,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:11,544 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:11,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444511781] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:11,544 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:11,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 16 [2022-03-19 08:23:11,724 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:11,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [414453189] [2022-03-19 08:23:11,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [414453189] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:11,724 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:11,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-19 08:23:11,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732661679] [2022-03-19 08:23:11,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:11,724 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-19 08:23:11,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:11,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-19 08:23:11,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:23:11,725 INFO L87 Difference]: Start difference. First operand 74 states and 93 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:12,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:12,488 INFO L93 Difference]: Finished difference Result 121 states and 157 transitions. [2022-03-19 08:23:12,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 08:23:12,488 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2022-03-19 08:23:12,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:12,489 INFO L225 Difference]: With dead ends: 121 [2022-03-19 08:23:12,489 INFO L226 Difference]: Without dead ends: 111 [2022-03-19 08:23:12,489 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=180, Invalid=812, Unknown=0, NotChecked=0, Total=992 [2022-03-19 08:23:12,490 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 106 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:12,490 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 40 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:23:12,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-19 08:23:12,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 82. [2022-03-19 08:23:12,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.2857142857142858) internal successors, (99), 77 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:12,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 103 transitions. [2022-03-19 08:23:12,513 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 103 transitions. Word has length 30 [2022-03-19 08:23:12,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:12,513 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 103 transitions. [2022-03-19 08:23:12,513 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:12,513 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 103 transitions. [2022-03-19 08:23:12,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-19 08:23:12,513 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:12,513 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:12,530 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:12,730 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:12,730 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:12,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:12,731 INFO L85 PathProgramCache]: Analyzing trace with hash -543637167, now seen corresponding path program 7 times [2022-03-19 08:23:12,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:12,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [260284873] [2022-03-19 08:23:12,866 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:12,867 INFO L85 PathProgramCache]: Analyzing trace with hash 586029584, now seen corresponding path program 1 times [2022-03-19 08:23:12,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:12,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223151325] [2022-03-19 08:23:12,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:12,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:12,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:13,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:13,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:13,071 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:23:13,071 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:13,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223151325] [2022-03-19 08:23:13,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223151325] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:13,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876174756] [2022-03-19 08:23:13,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:13,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:13,072 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:13,073 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:13,074 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-19 08:23:13,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:13,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-19 08:23:13,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:13,315 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:23:13,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:13,943 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:23:13,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876174756] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:13,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:13,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 17] total 31 [2022-03-19 08:23:14,214 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:14,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [260284873] [2022-03-19 08:23:14,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [260284873] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:14,215 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:14,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-19 08:23:14,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868728908] [2022-03-19 08:23:14,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:14,215 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-19 08:23:14,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:14,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-19 08:23:14,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1023, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 08:23:14,216 INFO L87 Difference]: Start difference. First operand 82 states and 103 transitions. Second operand has 17 states, 17 states have (on average 1.588235294117647) 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) [2022-03-19 08:23:15,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:15,728 INFO L93 Difference]: Finished difference Result 142 states and 183 transitions. [2022-03-19 08:23:15,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 08:23:15,729 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.588235294117647) 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 31 [2022-03-19 08:23:15,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:15,730 INFO L225 Difference]: With dead ends: 142 [2022-03-19 08:23:15,730 INFO L226 Difference]: Without dead ends: 94 [2022-03-19 08:23:15,730 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 44 SyntacticMatches, 9 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=316, Invalid=2546, Unknown=0, NotChecked=0, Total=2862 [2022-03-19 08:23:15,731 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 54 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:15,731 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 84 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:23:15,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-19 08:23:15,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2022-03-19 08:23:15,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.2911392405063291) internal successors, (102), 79 states have internal predecessors, (102), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:15,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 106 transitions. [2022-03-19 08:23:15,757 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 106 transitions. Word has length 31 [2022-03-19 08:23:15,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:15,757 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 106 transitions. [2022-03-19 08:23:15,757 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.588235294117647) 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) [2022-03-19 08:23:15,757 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 106 transitions. [2022-03-19 08:23:15,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 08:23:15,757 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:15,757 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:15,774 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:15,973 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-03-19 08:23:15,973 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:15,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:15,974 INFO L85 PathProgramCache]: Analyzing trace with hash 361612114, now seen corresponding path program 8 times [2022-03-19 08:23:15,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:15,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1247727988] [2022-03-19 08:23:16,064 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:16,065 INFO L85 PathProgramCache]: Analyzing trace with hash -917908813, now seen corresponding path program 1 times [2022-03-19 08:23:16,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:16,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610170288] [2022-03-19 08:23:16,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:16,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:16,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:16,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:16,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:16,143 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-19 08:23:16,143 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:16,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610170288] [2022-03-19 08:23:16,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610170288] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:16,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711436492] [2022-03-19 08:23:16,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:16,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:16,143 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:16,144 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:16,145 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-19 08:23:16,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:16,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:23:16,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:16,235 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-19 08:23:16,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:16,295 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-19 08:23:16,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711436492] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:16,295 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:16,295 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 7 [2022-03-19 08:23:16,400 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:16,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1247727988] [2022-03-19 08:23:16,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1247727988] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:16,400 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:16,400 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:23:16,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085367642] [2022-03-19 08:23:16,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:16,400 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 08:23:16,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:16,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 08:23:16,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2022-03-19 08:23:16,401 INFO L87 Difference]: Start difference. First operand 84 states and 106 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:16,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:16,989 INFO L93 Difference]: Finished difference Result 94 states and 116 transitions. [2022-03-19 08:23:16,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 08:23:16,990 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 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 32 [2022-03-19 08:23:16,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:16,991 INFO L225 Difference]: With dead ends: 94 [2022-03-19 08:23:16,991 INFO L226 Difference]: Without dead ends: 71 [2022-03-19 08:23:16,991 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=117, Invalid=389, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:23:16,991 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 32 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:16,991 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 48 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:23:16,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-19 08:23:17,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2022-03-19 08:23:17,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.3333333333333333) internal successors, (84), 63 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:17,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 88 transitions. [2022-03-19 08:23:17,013 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 88 transitions. Word has length 32 [2022-03-19 08:23:17,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:17,013 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 88 transitions. [2022-03-19 08:23:17,013 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:17,013 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 88 transitions. [2022-03-19 08:23:17,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 08:23:17,013 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:17,013 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:17,030 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:17,230 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:17,230 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:17,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:17,230 INFO L85 PathProgramCache]: Analyzing trace with hash 93956866, now seen corresponding path program 12 times [2022-03-19 08:23:17,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:17,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1685238601] [2022-03-19 08:23:17,358 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:17,358 INFO L85 PathProgramCache]: Analyzing trace with hash -515496978, now seen corresponding path program 1 times [2022-03-19 08:23:17,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:17,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796106265] [2022-03-19 08:23:17,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:17,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:17,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:17,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:17,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:17,493 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:23:17,493 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:17,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796106265] [2022-03-19 08:23:17,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796106265] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:17,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217609995] [2022-03-19 08:23:17,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:17,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:17,494 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:17,497 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:17,498 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-19 08:23:17,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:17,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:23:17,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:17,688 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:23:17,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:17,772 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:23:17,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217609995] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:17,772 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:17,773 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 15 [2022-03-19 08:23:17,942 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:17,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1685238601] [2022-03-19 08:23:17,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1685238601] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:17,943 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:17,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 08:23:17,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827213598] [2022-03-19 08:23:17,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:17,944 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 08:23:17,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:17,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 08:23:17,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:23:17,945 INFO L87 Difference]: Start difference. First operand 68 states and 88 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:19,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:19,296 INFO L93 Difference]: Finished difference Result 97 states and 128 transitions. [2022-03-19 08:23:19,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 08:23:19,297 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-19 08:23:19,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:19,298 INFO L225 Difference]: With dead ends: 97 [2022-03-19 08:23:19,298 INFO L226 Difference]: Without dead ends: 92 [2022-03-19 08:23:19,298 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=352, Invalid=1370, Unknown=0, NotChecked=0, Total=1722 [2022-03-19 08:23:19,299 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 31 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:19,300 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 42 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:23:19,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-03-19 08:23:19,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 77. [2022-03-19 08:23:19,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.3055555555555556) internal successors, (94), 72 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:19,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 98 transitions. [2022-03-19 08:23:19,339 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 98 transitions. Word has length 32 [2022-03-19 08:23:19,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:19,339 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 98 transitions. [2022-03-19 08:23:19,339 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:19,339 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 98 transitions. [2022-03-19 08:23:19,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 08:23:19,339 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:19,339 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:19,356 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-03-19 08:23:19,555 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-03-19 08:23:19,556 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:19,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:19,556 INFO L85 PathProgramCache]: Analyzing trace with hash 2035160497, now seen corresponding path program 13 times [2022-03-19 08:23:19,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:19,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1540461202] [2022-03-19 08:23:19,682 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:19,682 INFO L85 PathProgramCache]: Analyzing trace with hash -160876963, now seen corresponding path program 1 times [2022-03-19 08:23:19,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:19,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017365277] [2022-03-19 08:23:19,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:19,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:19,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:19,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:19,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:19,967 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:19,968 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:19,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017365277] [2022-03-19 08:23:19,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017365277] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:19,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345890996] [2022-03-19 08:23:19,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:19,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:19,968 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:19,969 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:19,971 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-19 08:23:19,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:20,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-19 08:23:20,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:20,459 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:20,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:20,593 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:23:20,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345890996] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:20,593 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:20,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 8] total 27 [2022-03-19 08:23:21,020 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:21,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1540461202] [2022-03-19 08:23:21,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1540461202] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:21,020 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:21,020 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-19 08:23:21,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998974813] [2022-03-19 08:23:21,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:21,021 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-19 08:23:21,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:21,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-19 08:23:21,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=848, Unknown=0, NotChecked=0, Total=930 [2022-03-19 08:23:21,021 INFO L87 Difference]: Start difference. First operand 77 states and 98 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:32,123 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 08:23:32,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:32,147 INFO L93 Difference]: Finished difference Result 155 states and 205 transitions. [2022-03-19 08:23:32,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-19 08:23:32,149 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-19 08:23:32,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:32,149 INFO L225 Difference]: With dead ends: 155 [2022-03-19 08:23:32,149 INFO L226 Difference]: Without dead ends: 127 [2022-03-19 08:23:32,151 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1529 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=789, Invalid=5531, Unknown=0, NotChecked=0, Total=6320 [2022-03-19 08:23:32,152 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 142 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 189 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:32,152 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 84 Invalid, 752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 562 Invalid, 1 Unknown, 0 Unchecked, 3.5s Time] [2022-03-19 08:23:32,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-03-19 08:23:32,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 88. [2022-03-19 08:23:32,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.2891566265060241) internal successors, (107), 83 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:32,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 111 transitions. [2022-03-19 08:23:32,203 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 111 transitions. Word has length 32 [2022-03-19 08:23:32,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:32,203 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 111 transitions. [2022-03-19 08:23:32,203 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:32,203 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 111 transitions. [2022-03-19 08:23:32,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-19 08:23:32,203 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:32,203 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:32,220 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:32,419 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:32,419 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:32,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:32,420 INFO L85 PathProgramCache]: Analyzing trace with hash -398850032, now seen corresponding path program 14 times [2022-03-19 08:23:32,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:32,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [281445017] [2022-03-19 08:23:32,565 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:32,565 INFO L85 PathProgramCache]: Analyzing trace with hash -1695986396, now seen corresponding path program 1 times [2022-03-19 08:23:32,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:32,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367934689] [2022-03-19 08:23:32,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:32,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:32,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:32,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:32,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:32,848 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:23:32,848 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:32,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367934689] [2022-03-19 08:23:32,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367934689] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:32,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705349975] [2022-03-19 08:23:32,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:32,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:32,848 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:32,849 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:32,850 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-19 08:23:32,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:32,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-19 08:23:32,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:33,490 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:33,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:33,932 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:33,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705349975] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:33,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:33,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 9] total 30 [2022-03-19 08:23:34,739 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:34,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [281445017] [2022-03-19 08:23:34,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [281445017] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:34,740 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:34,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 08:23:34,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260671674] [2022-03-19 08:23:34,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:34,740 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 08:23:34,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:34,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 08:23:34,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1009, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 08:23:34,741 INFO L87 Difference]: Start difference. First operand 88 states and 111 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:36,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:36,675 INFO L93 Difference]: Finished difference Result 153 states and 201 transitions. [2022-03-19 08:23:36,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 08:23:36,676 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 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 33 [2022-03-19 08:23:36,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:36,676 INFO L225 Difference]: With dead ends: 153 [2022-03-19 08:23:36,676 INFO L226 Difference]: Without dead ends: 142 [2022-03-19 08:23:36,677 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=287, Invalid=2163, Unknown=0, NotChecked=0, Total=2450 [2022-03-19 08:23:36,677 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 98 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:36,678 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 55 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:23:36,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-03-19 08:23:36,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 98. [2022-03-19 08:23:36,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 93 states have (on average 1.2903225806451613) internal successors, (120), 93 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:36,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 124 transitions. [2022-03-19 08:23:36,718 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 124 transitions. Word has length 33 [2022-03-19 08:23:36,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:36,718 INFO L478 AbstractCegarLoop]: Abstraction has 98 states and 124 transitions. [2022-03-19 08:23:36,718 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:36,718 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 124 transitions. [2022-03-19 08:23:36,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-19 08:23:36,718 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:36,719 INFO L500 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:36,735 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-19 08:23:36,931 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:36,932 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:36,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:36,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1273237790, now seen corresponding path program 15 times [2022-03-19 08:23:36,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:36,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [913062176] [2022-03-19 08:23:37,065 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:37,065 INFO L85 PathProgramCache]: Analyzing trace with hash 1471742990, now seen corresponding path program 1 times [2022-03-19 08:23:37,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:37,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000716441] [2022-03-19 08:23:37,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:37,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:37,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:37,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:37,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:37,297 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-19 08:23:37,297 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:37,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000716441] [2022-03-19 08:23:37,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000716441] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:37,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407403787] [2022-03-19 08:23:37,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:37,297 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:37,297 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:37,299 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:37,300 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-19 08:23:37,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:37,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-19 08:23:37,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:37,441 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-19 08:23:37,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:37,772 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-19 08:23:37,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407403787] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:37,772 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:37,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 19 [2022-03-19 08:23:38,353 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:38,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [913062176] [2022-03-19 08:23:38,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [913062176] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:38,353 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:38,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-19 08:23:38,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806772656] [2022-03-19 08:23:38,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:38,353 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-19 08:23:38,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:38,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-19 08:23:38,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:23:38,354 INFO L87 Difference]: Start difference. First operand 98 states and 124 transitions. Second operand has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:40,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:40,911 INFO L93 Difference]: Finished difference Result 117 states and 143 transitions. [2022-03-19 08:23:40,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-19 08:23:40,911 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 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 [2022-03-19 08:23:40,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:40,912 INFO L225 Difference]: With dead ends: 117 [2022-03-19 08:23:40,912 INFO L226 Difference]: Without dead ends: 104 [2022-03-19 08:23:40,912 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=206, Invalid=1434, Unknown=0, NotChecked=0, Total=1640 [2022-03-19 08:23:40,912 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 45 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:40,913 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 80 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-19 08:23:40,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-03-19 08:23:40,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 96. [2022-03-19 08:23:40,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.2747252747252746) internal successors, (116), 91 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) [2022-03-19 08:23:40,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 120 transitions. [2022-03-19 08:23:40,948 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 120 transitions. Word has length 34 [2022-03-19 08:23:40,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:40,948 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 120 transitions. [2022-03-19 08:23:40,948 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:40,948 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 120 transitions. [2022-03-19 08:23:40,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-19 08:23:40,948 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:40,948 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:40,965 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:41,165 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:41,165 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:41,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:41,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1983137790, now seen corresponding path program 16 times [2022-03-19 08:23:41,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:41,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2103614655] [2022-03-19 08:23:41,291 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:41,292 INFO L85 PathProgramCache]: Analyzing trace with hash 768378094, now seen corresponding path program 1 times [2022-03-19 08:23:41,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:41,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398363816] [2022-03-19 08:23:41,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:41,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:41,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:41,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:41,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:41,696 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:41,697 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:41,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398363816] [2022-03-19 08:23:41,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398363816] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:41,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [23000853] [2022-03-19 08:23:41,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:41,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:41,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:41,698 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:41,699 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-19 08:23:41,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:41,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-19 08:23:41,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:41,904 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:41,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:42,441 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:23:42,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [23000853] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:42,442 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:42,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 24 [2022-03-19 08:23:43,284 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:43,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2103614655] [2022-03-19 08:23:43,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2103614655] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:43,285 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:43,285 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-19 08:23:43,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833195002] [2022-03-19 08:23:43,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:43,285 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-19 08:23:43,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:43,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-19 08:23:43,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=683, Unknown=0, NotChecked=0, Total=756 [2022-03-19 08:23:43,286 INFO L87 Difference]: Start difference. First operand 96 states and 120 transitions. Second operand has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:02,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:02,369 INFO L93 Difference]: Finished difference Result 194 states and 257 transitions. [2022-03-19 08:24:02,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-03-19 08:24:02,370 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-19 08:24:02,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:02,371 INFO L225 Difference]: With dead ends: 194 [2022-03-19 08:24:02,371 INFO L226 Difference]: Without dead ends: 164 [2022-03-19 08:24:02,372 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2583 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=1372, Invalid=8330, Unknown=0, NotChecked=0, Total=9702 [2022-03-19 08:24:02,373 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 216 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 310 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 1103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 310 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:02,373 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 98 Invalid, 1103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [310 Valid, 793 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-03-19 08:24:02,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-03-19 08:24:02,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 109. [2022-03-19 08:24:02,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.2788461538461537) internal successors, (133), 104 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:02,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 137 transitions. [2022-03-19 08:24:02,414 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 137 transitions. Word has length 34 [2022-03-19 08:24:02,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:02,414 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 137 transitions. [2022-03-19 08:24:02,414 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:02,414 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 137 transitions. [2022-03-19 08:24:02,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-19 08:24:02,414 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:02,415 INFO L500 BasicCegarLoop]: trace histogram [7, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:02,433 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-19 08:24:02,633 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-03-19 08:24:02,633 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:02,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:02,634 INFO L85 PathProgramCache]: Analyzing trace with hash -412045345, now seen corresponding path program 17 times [2022-03-19 08:24:02,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:02,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [154701829] [2022-03-19 08:24:02,758 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:24:02,758 INFO L85 PathProgramCache]: Analyzing trace with hash -811810637, now seen corresponding path program 1 times [2022-03-19 08:24:02,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:02,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777990275] [2022-03-19 08:24:02,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:02,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:02,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:03,067 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:03,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:03,069 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:24:03,070 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:03,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777990275] [2022-03-19 08:24:03,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1777990275] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:03,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878655347] [2022-03-19 08:24:03,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:03,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:03,070 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:03,071 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:24:03,072 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-19 08:24:03,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:03,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-19 08:24:03,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:03,687 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:24:03,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:03,758 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:24:03,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878655347] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:03,759 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:03,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 20 [2022-03-19 08:24:04,656 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:04,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [154701829] [2022-03-19 08:24:04,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [154701829] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:04,657 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:04,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 08:24:04,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57186800] [2022-03-19 08:24:04,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:04,657 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 08:24:04,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:04,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 08:24:04,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2022-03-19 08:24:04,658 INFO L87 Difference]: Start difference. First operand 109 states and 137 transitions. Second operand has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:07,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:07,340 INFO L93 Difference]: Finished difference Result 179 states and 231 transitions. [2022-03-19 08:24:07,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-19 08:24:07,340 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 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 35 [2022-03-19 08:24:07,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:07,346 INFO L225 Difference]: With dead ends: 179 [2022-03-19 08:24:07,346 INFO L226 Difference]: Without dead ends: 168 [2022-03-19 08:24:07,347 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=271, Invalid=1369, Unknown=0, NotChecked=0, Total=1640 [2022-03-19 08:24:07,347 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 122 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:07,347 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 43 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-19 08:24:07,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-03-19 08:24:07,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 119. [2022-03-19 08:24:07,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.2719298245614035) internal successors, (145), 114 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:07,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 149 transitions. [2022-03-19 08:24:07,418 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 149 transitions. Word has length 35 [2022-03-19 08:24:07,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:07,418 INFO L478 AbstractCegarLoop]: Abstraction has 119 states and 149 transitions. [2022-03-19 08:24:07,418 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:07,418 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 149 transitions. [2022-03-19 08:24:07,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-19 08:24:07,418 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:07,418 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:07,434 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-19 08:24:07,629 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-03-19 08:24:07,629 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:07,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:07,629 INFO L85 PathProgramCache]: Analyzing trace with hash 955015874, now seen corresponding path program 9 times [2022-03-19 08:24:07,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:07,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1509852199] [2022-03-19 08:24:07,761 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:24:07,762 INFO L85 PathProgramCache]: Analyzing trace with hash -862505938, now seen corresponding path program 1 times [2022-03-19 08:24:07,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:07,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840191865] [2022-03-19 08:24:07,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:07,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:07,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:08,212 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:08,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:08,215 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:08,215 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:08,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840191865] [2022-03-19 08:24:08,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840191865] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:08,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1127170833] [2022-03-19 08:24:08,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:08,216 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:08,216 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:08,217 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:24:08,218 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-19 08:24:08,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:08,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 54 conjunts are in the unsatisfiable core [2022-03-19 08:24:08,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:08,599 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:24:08,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:10,178 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:10,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1127170833] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:10,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:10,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 20] total 37 [2022-03-19 08:24:11,694 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:11,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1509852199] [2022-03-19 08:24:11,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1509852199] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:11,695 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:11,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 08:24:11,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769827971] [2022-03-19 08:24:11,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:11,695 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 08:24:11,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:11,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 08:24:11,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1517, Unknown=0, NotChecked=0, Total=1640 [2022-03-19 08:24:11,696 INFO L87 Difference]: Start difference. First operand 119 states and 149 transitions. Second operand has 20 states, 20 states have (on average 1.6) internal successors, (32), 18 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:17,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:17,749 INFO L93 Difference]: Finished difference Result 199 states and 253 transitions. [2022-03-19 08:24:17,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-19 08:24:17,751 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.6) internal successors, (32), 18 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2022-03-19 08:24:17,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:17,751 INFO L225 Difference]: With dead ends: 199 [2022-03-19 08:24:17,752 INFO L226 Difference]: Without dead ends: 139 [2022-03-19 08:24:17,753 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 55 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=435, Invalid=3855, Unknown=0, NotChecked=0, Total=4290 [2022-03-19 08:24:17,753 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 69 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 613 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:17,753 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 91 Invalid, 709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 613 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-19 08:24:17,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-03-19 08:24:17,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 121. [2022-03-19 08:24:17,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.2758620689655173) internal successors, (148), 116 states have internal predecessors, (148), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:17,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 152 transitions. [2022-03-19 08:24:17,833 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 152 transitions. Word has length 36 [2022-03-19 08:24:17,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:17,833 INFO L478 AbstractCegarLoop]: Abstraction has 121 states and 152 transitions. [2022-03-19 08:24:17,833 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.6) internal successors, (32), 18 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:17,833 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 152 transitions. [2022-03-19 08:24:17,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-19 08:24:17,834 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:17,834 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:17,852 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-19 08:24:18,043 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:18,044 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:18,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:18,044 INFO L85 PathProgramCache]: Analyzing trace with hash 1466061842, now seen corresponding path program 18 times [2022-03-19 08:24:18,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:18,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [637546542] [2022-03-19 08:24:18,168 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:24:18,168 INFO L85 PathProgramCache]: Analyzing trace with hash -984836205, now seen corresponding path program 1 times [2022-03-19 08:24:18,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:18,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271607750] [2022-03-19 08:24:18,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:18,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:18,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:18,374 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:18,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:18,377 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:24:18,377 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:18,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271607750] [2022-03-19 08:24:18,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271607750] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:18,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328780699] [2022-03-19 08:24:18,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:18,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:18,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:18,382 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:24:18,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-19 08:24:18,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:18,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 08:24:18,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:19,263 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:19,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:19,922 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:24:19,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1328780699] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:19,922 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:19,922 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18, 8] total 33 [2022-03-19 08:24:21,607 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:21,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [637546542] [2022-03-19 08:24:21,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [637546542] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:21,607 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:21,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 08:24:21,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084830278] [2022-03-19 08:24:21,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:21,608 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 08:24:21,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:21,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 08:24:21,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1268, Unknown=0, NotChecked=0, Total=1406 [2022-03-19 08:24:21,609 INFO L87 Difference]: Start difference. First operand 121 states and 152 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:33,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:33,675 INFO L93 Difference]: Finished difference Result 163 states and 209 transitions. [2022-03-19 08:24:33,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-19 08:24:33,677 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 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 36 [2022-03-19 08:24:33,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:33,678 INFO L225 Difference]: With dead ends: 163 [2022-03-19 08:24:33,678 INFO L226 Difference]: Without dead ends: 158 [2022-03-19 08:24:33,678 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=683, Invalid=4867, Unknown=0, NotChecked=0, Total=5550 [2022-03-19 08:24:33,679 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 53 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:33,679 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 47 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-19 08:24:33,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-03-19 08:24:33,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 122. [2022-03-19 08:24:33,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.2735042735042734) internal successors, (149), 117 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:33,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 153 transitions. [2022-03-19 08:24:33,735 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 153 transitions. Word has length 36 [2022-03-19 08:24:33,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:33,735 INFO L478 AbstractCegarLoop]: Abstraction has 122 states and 153 transitions. [2022-03-19 08:24:33,735 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:33,735 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 153 transitions. [2022-03-19 08:24:33,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 08:24:33,736 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:33,736 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:33,752 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-19 08:24:33,943 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-03-19 08:24:33,944 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:33,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:33,944 INFO L85 PathProgramCache]: Analyzing trace with hash -424783871, now seen corresponding path program 10 times [2022-03-19 08:24:33,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:33,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [616798586] [2022-03-19 08:24:34,077 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:24:34,078 INFO L85 PathProgramCache]: Analyzing trace with hash 1894124693, now seen corresponding path program 1 times [2022-03-19 08:24:34,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:34,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397422012] [2022-03-19 08:24:34,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:34,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:34,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:34,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:34,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:34,290 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-19 08:24:34,291 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:34,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397422012] [2022-03-19 08:24:34,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397422012] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:34,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973162366] [2022-03-19 08:24:34,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:34,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:34,291 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:34,304 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:24:34,305 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-19 08:24:34,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:34,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 08:24:34,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:34,691 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:24:34,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:35,558 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:24:35,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973162366] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:35,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:35,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14, 16] total 24 [2022-03-19 08:24:37,044 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:37,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [616798586] [2022-03-19 08:24:37,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [616798586] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:37,045 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:37,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 08:24:37,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104859259] [2022-03-19 08:24:37,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:37,045 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 08:24:37,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:37,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 08:24:37,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2022-03-19 08:24:37,046 INFO L87 Difference]: Start difference. First operand 122 states and 153 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:42,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:42,330 INFO L93 Difference]: Finished difference Result 146 states and 177 transitions. [2022-03-19 08:24:42,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-19 08:24:42,331 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 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 37 [2022-03-19 08:24:42,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:42,331 INFO L225 Difference]: With dead ends: 146 [2022-03-19 08:24:42,331 INFO L226 Difference]: Without dead ends: 119 [2022-03-19 08:24:42,332 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 63 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=247, Invalid=1733, Unknown=0, NotChecked=0, Total=1980 [2022-03-19 08:24:42,332 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 33 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:42,332 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 48 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:24:42,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-03-19 08:24:42,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 111. [2022-03-19 08:24:42,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.2735849056603774) internal successors, (135), 106 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:42,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 139 transitions. [2022-03-19 08:24:42,383 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 139 transitions. Word has length 37 [2022-03-19 08:24:42,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:42,383 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 139 transitions. [2022-03-19 08:24:42,383 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:42,383 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 139 transitions. [2022-03-19 08:24:42,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 08:24:42,384 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:42,384 INFO L500 BasicCegarLoop]: trace histogram [8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:42,400 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-03-19 08:24:42,588 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-03-19 08:24:42,588 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:42,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:42,588 INFO L85 PathProgramCache]: Analyzing trace with hash 636983262, now seen corresponding path program 19 times [2022-03-19 08:24:42,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:42,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [752965959] [2022-03-19 08:24:42,718 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:24:42,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1644123133, now seen corresponding path program 1 times [2022-03-19 08:24:42,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:42,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769293759] [2022-03-19 08:24:42,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:42,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:42,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:43,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:43,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:43,451 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:24:43,451 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:43,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769293759] [2022-03-19 08:24:43,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769293759] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:43,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276883695] [2022-03-19 08:24:43,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:43,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:43,452 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:43,453 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) [2022-03-19 08:24:43,455 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-19 08:24:43,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:43,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-19 08:24:43,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:43,695 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:24:43,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:44,735 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:24:44,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276883695] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:44,735 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:44,735 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 27 [2022-03-19 08:24:47,250 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:47,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [752965959] [2022-03-19 08:24:47,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [752965959] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:47,251 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:47,251 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-19 08:24:47,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843846147] [2022-03-19 08:24:47,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:47,251 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-19 08:24:47,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:47,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-19 08:24:47,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=905, Unknown=0, NotChecked=0, Total=992 [2022-03-19 08:24:47,252 INFO L87 Difference]: Start difference. First operand 111 states and 139 transitions. Second operand has 24 states, 24 states have (on average 1.375) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:37,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:25:37,053 INFO L93 Difference]: Finished difference Result 236 states and 312 transitions. [2022-03-19 08:25:37,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-03-19 08:25:37,055 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.375) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-19 08:25:37,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:25:37,056 INFO L225 Difference]: With dead ends: 236 [2022-03-19 08:25:37,056 INFO L226 Difference]: Without dead ends: 202 [2022-03-19 08:25:37,057 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 65 SyntacticMatches, 7 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3829 ImplicationChecksByTransitivity, 48.2s TimeCoverageRelationStatistics Valid=1891, Invalid=11915, Unknown=0, NotChecked=0, Total=13806 [2022-03-19 08:25:37,057 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 209 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 940 mSolverCounterSat, 338 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 1278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 338 IncrementalHoareTripleChecker+Valid, 940 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:25:37,057 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 114 Invalid, 1278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [338 Valid, 940 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2022-03-19 08:25:37,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-03-19 08:25:37,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 126. [2022-03-19 08:25:37,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.2727272727272727) internal successors, (154), 121 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:37,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 158 transitions. [2022-03-19 08:25:37,151 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 158 transitions. Word has length 37 [2022-03-19 08:25:37,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:25:37,151 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 158 transitions. [2022-03-19 08:25:37,152 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.375) internal successors, (33), 23 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:37,152 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 158 transitions. [2022-03-19 08:25:37,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-19 08:25:37,152 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:25:37,152 INFO L500 BasicCegarLoop]: trace histogram [8, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:25:37,168 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-03-19 08:25:37,368 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-19 08:25:37,368 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:25:37,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:25:37,369 INFO L85 PathProgramCache]: Analyzing trace with hash -792671357, now seen corresponding path program 20 times [2022-03-19 08:25:37,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:25:37,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1047605066] [2022-03-19 08:25:37,490 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:25:37,490 INFO L85 PathProgramCache]: Analyzing trace with hash 1777648516, now seen corresponding path program 1 times [2022-03-19 08:25:37,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:25:37,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135537858] [2022-03-19 08:25:37,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:25:37,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:25:37,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:38,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:25:38,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:38,484 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-19 08:25:38,484 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:25:38,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135537858] [2022-03-19 08:25:38,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135537858] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:25:38,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205950937] [2022-03-19 08:25:38,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:25:38,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:25:38,485 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:25:38,486 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) [2022-03-19 08:25:38,487 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-19 08:25:38,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:38,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 08:25:38,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:25:39,830 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:25:39,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:25:39,952 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:25:39,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205950937] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:25:39,953 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:25:39,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 22 [2022-03-19 08:25:43,051 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:25:43,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1047605066] [2022-03-19 08:25:43,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1047605066] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:25:43,052 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:25:43,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 08:25:43,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958857720] [2022-03-19 08:25:43,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:25:43,052 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 08:25:43,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:25:43,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 08:25:43,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=594, Unknown=0, NotChecked=0, Total=702 [2022-03-19 08:25:43,053 INFO L87 Difference]: Start difference. First operand 126 states and 158 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:50,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:25:50,981 INFO L93 Difference]: Finished difference Result 218 states and 283 transitions. [2022-03-19 08:25:50,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 08:25:50,982 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 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 [2022-03-19 08:25:50,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:25:50,983 INFO L225 Difference]: With dead ends: 218 [2022-03-19 08:25:50,983 INFO L226 Difference]: Without dead ends: 206 [2022-03-19 08:25:50,983 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=357, Invalid=1805, Unknown=0, NotChecked=0, Total=2162 [2022-03-19 08:25:50,983 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 156 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:25:50,984 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 38 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 347 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-19 08:25:50,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-03-19 08:25:51,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 138. [2022-03-19 08:25:51,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 133 states have (on average 1.2706766917293233) internal successors, (169), 133 states have internal predecessors, (169), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:51,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 173 transitions. [2022-03-19 08:25:51,067 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 173 transitions. Word has length 38 [2022-03-19 08:25:51,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:25:51,067 INFO L478 AbstractCegarLoop]: Abstraction has 138 states and 173 transitions. [2022-03-19 08:25:51,067 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:51,067 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 173 transitions. [2022-03-19 08:25:51,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-19 08:25:51,068 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:25:51,068 INFO L500 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:25:51,105 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-03-19 08:25:51,290 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:25:51,290 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:25:51,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:25:51,290 INFO L85 PathProgramCache]: Analyzing trace with hash -1500294481, now seen corresponding path program 21 times [2022-03-19 08:25:51,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:25:51,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [714788111] [2022-03-19 08:25:51,425 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:25:51,426 INFO L85 PathProgramCache]: Analyzing trace with hash 1746940558, now seen corresponding path program 1 times [2022-03-19 08:25:51,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:25:51,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846130118] [2022-03-19 08:25:51,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:25:51,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:25:51,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:51,949 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:25:51,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:51,951 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-19 08:25:51,951 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:25:51,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846130118] [2022-03-19 08:25:51,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846130118] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:25:51,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153280781] [2022-03-19 08:25:51,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:25:51,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:25:51,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:25:51,957 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) [2022-03-19 08:25:51,958 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-19 08:25:51,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:51,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:25:51,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:25:52,121 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-19 08:25:52,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:25:52,822 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-19 08:25:52,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153280781] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:25:52,822 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:25:52,822 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2022-03-19 08:25:55,328 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:25:55,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [714788111] [2022-03-19 08:25:55,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [714788111] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:25:55,329 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:25:55,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 08:25:55,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723135501] [2022-03-19 08:25:55,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:25:55,329 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 08:25:55,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:25:55,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 08:25:55,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2022-03-19 08:25:55,330 INFO L87 Difference]: Start difference. First operand 138 states and 173 transitions. Second operand has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:26:04,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:26:04,566 INFO L93 Difference]: Finished difference Result 165 states and 200 transitions. [2022-03-19 08:26:04,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-19 08:26:04,567 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 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 39 [2022-03-19 08:26:04,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:26:04,568 INFO L225 Difference]: With dead ends: 165 [2022-03-19 08:26:04,568 INFO L226 Difference]: Without dead ends: 150 [2022-03-19 08:26:04,568 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 77 SyntacticMatches, 5 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=264, Invalid=2088, Unknown=0, NotChecked=0, Total=2352 [2022-03-19 08:26:04,568 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 682 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:26:04,568 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 97 Invalid, 745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 682 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-19 08:26:04,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-03-19 08:26:04,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 135. [2022-03-19 08:26:04,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.2615384615384615) internal successors, (164), 130 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) [2022-03-19 08:26:04,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 168 transitions. [2022-03-19 08:26:04,637 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 168 transitions. Word has length 39 [2022-03-19 08:26:04,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:26:04,637 INFO L478 AbstractCegarLoop]: Abstraction has 135 states and 168 transitions. [2022-03-19 08:26:04,638 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:26:04,638 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 168 transitions. [2022-03-19 08:26:04,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-19 08:26:04,638 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:26:04,638 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:26:04,654 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-19 08:26:04,851 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:26:04,851 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:26:04,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:26:04,852 INFO L85 PathProgramCache]: Analyzing trace with hash -274625873, now seen corresponding path program 22 times [2022-03-19 08:26:04,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:26:04,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [340183193] [2022-03-19 08:26:04,981 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:26:04,981 INFO L85 PathProgramCache]: Analyzing trace with hash -445627826, now seen corresponding path program 1 times [2022-03-19 08:26:04,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:26:04,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420126203] [2022-03-19 08:26:04,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:26:04,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:26:04,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:06,127 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:26:06,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:06,148 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:26:06,148 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:26:06,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420126203] [2022-03-19 08:26:06,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420126203] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:26:06,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429744440] [2022-03-19 08:26:06,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:26:06,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:26:06,149 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:26:06,150 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) [2022-03-19 08:26:06,151 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-19 08:26:06,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:06,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-19 08:26:06,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:26:09,528 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:26:09,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:26:10,070 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:26:10,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1429744440] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:26:10,070 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:26:10,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 11] total 39 [2022-03-19 08:26:14,068 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:26:14,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [340183193] [2022-03-19 08:26:14,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [340183193] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:26:14,068 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:26:14,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:26:14,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461072132] [2022-03-19 08:26:14,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:26:14,068 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:26:14,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:26:14,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:26:14,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1771, Unknown=0, NotChecked=0, Total=1892 [2022-03-19 08:26:14,069 INFO L87 Difference]: Start difference. First operand 135 states and 168 transitions. Second operand has 26 states, 26 states have (on average 1.3461538461538463) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:28:26,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:28:26,212 INFO L93 Difference]: Finished difference Result 284 states and 376 transitions. [2022-03-19 08:28:26,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-03-19 08:28:26,215 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3461538461538463) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-19 08:28:26,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:28:26,216 INFO L225 Difference]: With dead ends: 284 [2022-03-19 08:28:26,216 INFO L226 Difference]: Without dead ends: 248 [2022-03-19 08:28:26,217 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7919 ImplicationChecksByTransitivity, 131.3s TimeCoverageRelationStatistics Valid=2705, Invalid=22099, Unknown=2, NotChecked=0, Total=24806 [2022-03-19 08:28:26,218 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 360 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 1172 mSolverCounterSat, 574 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 1746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 574 IncrementalHoareTripleChecker+Valid, 1172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:28:26,218 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [360 Valid, 118 Invalid, 1746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [574 Valid, 1172 Invalid, 0 Unknown, 0 Unchecked, 9.1s Time] [2022-03-19 08:28:26,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2022-03-19 08:28:26,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 151. [2022-03-19 08:28:26,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.2671232876712328) internal successors, (185), 146 states have internal predecessors, (185), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:28:26,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 189 transitions. [2022-03-19 08:28:26,324 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 189 transitions. Word has length 39 [2022-03-19 08:28:26,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:28:26,324 INFO L478 AbstractCegarLoop]: Abstraction has 151 states and 189 transitions. [2022-03-19 08:28:26,324 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3461538461538463) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:28:26,324 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 189 transitions. [2022-03-19 08:28:26,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-19 08:28:26,325 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:28:26,325 INFO L500 BasicCegarLoop]: trace histogram [9, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:28:26,341 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-03-19 08:28:26,541 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,SelfDestructingSolverStorable42 [2022-03-19 08:28:26,541 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:28:26,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:28:26,542 INFO L85 PathProgramCache]: Analyzing trace with hash 1012216530, now seen corresponding path program 23 times [2022-03-19 08:28:26,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:28:26,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2123415900] [2022-03-19 08:28:26,642 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:28:26,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1414958931, now seen corresponding path program 1 times [2022-03-19 08:28:26,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:28:26,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636961786] [2022-03-19 08:28:26,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:28:26,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:28:26,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:28,645 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:28:28,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:28,647 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-03-19 08:28:28,648 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:28:28,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636961786] [2022-03-19 08:28:28,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636961786] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:28:28,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644708966] [2022-03-19 08:28:28,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:28:28,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:28:28,648 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:28:28,649 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) [2022-03-19 08:28:28,650 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-19 08:28:28,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:28,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 08:28:28,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:28:33,524 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:28:33,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:28:34,238 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 9 proven. 81 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:28:34,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1644708966] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:28:34,238 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:28:34,238 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21, 12] total 35 [2022-03-19 08:28:39,783 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:28:39,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2123415900] [2022-03-19 08:28:39,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2123415900] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:28:39,784 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:28:39,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-19 08:28:39,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472761343] [2022-03-19 08:28:39,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:28:39,784 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-19 08:28:39,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:28:39,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-19 08:28:39,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2022-03-19 08:28:39,785 INFO L87 Difference]: Start difference. First operand 151 states and 189 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:28:55,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:28:55,156 INFO L93 Difference]: Finished difference Result 249 states and 319 transitions. [2022-03-19 08:28:55,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-19 08:28:55,157 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 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 [2022-03-19 08:28:55,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:28:55,158 INFO L225 Difference]: With dead ends: 249 [2022-03-19 08:28:55,158 INFO L226 Difference]: Without dead ends: 237 [2022-03-19 08:28:55,158 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 26.2s TimeCoverageRelationStatistics Valid=412, Invalid=3248, Unknown=0, NotChecked=0, Total=3660 [2022-03-19 08:28:55,158 INFO L912 BasicCegarLoop]: 29 mSDtfsCounter, 129 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:28:55,158 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 56 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-19 08:28:55,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-03-19 08:28:55,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 163. [2022-03-19 08:28:55,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.259493670886076) internal successors, (199), 158 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:28:55,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 203 transitions. [2022-03-19 08:28:55,244 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 203 transitions. Word has length 40 [2022-03-19 08:28:55,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:28:55,244 INFO L478 AbstractCegarLoop]: Abstraction has 163 states and 203 transitions. [2022-03-19 08:28:55,244 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:28:55,244 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 203 transitions. [2022-03-19 08:28:55,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-19 08:28:55,244 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:28:55,244 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:28:55,262 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-03-19 08:28:55,459 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,SelfDestructingSolverStorable43 [2022-03-19 08:28:55,459 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:28:55,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:28:55,460 INFO L85 PathProgramCache]: Analyzing trace with hash -358359038, now seen corresponding path program 24 times [2022-03-19 08:28:55,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:28:55,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1497439653] [2022-03-19 08:28:55,584 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:28:55,584 INFO L85 PathProgramCache]: Analyzing trace with hash -505472306, now seen corresponding path program 1 times [2022-03-19 08:28:55,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:28:55,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991436452] [2022-03-19 08:28:55,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:28:55,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:28:55,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:56,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:28:56,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:56,502 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:28:56,502 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:28:56,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991436452] [2022-03-19 08:28:56,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991436452] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:28:56,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503201204] [2022-03-19 08:28:56,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:28:56,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:28:56,503 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:28:56,524 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) [2022-03-19 08:28:56,525 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-19 08:28:56,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:56,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-19 08:28:56,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:28:58,374 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:28:58,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:28:59,296 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:28:59,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503201204] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:28:59,296 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:28:59,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 9] total 28 [2022-03-19 08:29:03,608 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:29:03,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1497439653] [2022-03-19 08:29:03,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1497439653] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:29:03,608 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:29:03,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-19 08:29:03,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000993613] [2022-03-19 08:29:03,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:29:03,609 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-19 08:29:03,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:29:03,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-19 08:29:03,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=975, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 08:29:03,609 INFO L87 Difference]: Start difference. First operand 163 states and 203 transitions. Second operand has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 20 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:32,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:29:32,090 INFO L93 Difference]: Finished difference Result 217 states and 275 transitions. [2022-03-19 08:29:32,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-19 08:29:32,093 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 20 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 40 [2022-03-19 08:29:32,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:29:32,093 INFO L225 Difference]: With dead ends: 217 [2022-03-19 08:29:32,094 INFO L226 Difference]: Without dead ends: 212 [2022-03-19 08:29:32,094 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 60 SyntacticMatches, 5 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1511 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=901, Invalid=5261, Unknown=0, NotChecked=0, Total=6162 [2022-03-19 08:29:32,094 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 57 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 412 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 553 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:29:32,094 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 57 Invalid, 553 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 412 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-03-19 08:29:32,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-03-19 08:29:32,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 171. [2022-03-19 08:29:32,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.2469879518072289) internal successors, (207), 166 states have internal predecessors, (207), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:32,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 211 transitions. [2022-03-19 08:29:32,199 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 211 transitions. Word has length 40 [2022-03-19 08:29:32,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:29:32,200 INFO L478 AbstractCegarLoop]: Abstraction has 171 states and 211 transitions. [2022-03-19 08:29:32,200 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 20 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:32,200 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 211 transitions. [2022-03-19 08:29:32,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 08:29:32,200 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:29:32,200 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:29:32,216 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-03-19 08:29:32,416 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,SelfDestructingSolverStorable44 [2022-03-19 08:29:32,417 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:29:32,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:29:32,417 INFO L85 PathProgramCache]: Analyzing trace with hash -264974095, now seen corresponding path program 11 times [2022-03-19 08:29:32,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:29:32,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [702791261] [2022-03-19 08:29:32,502 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:29:32,502 INFO L85 PathProgramCache]: Analyzing trace with hash 783602704, now seen corresponding path program 1 times [2022-03-19 08:29:32,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:29:32,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668901044] [2022-03-19 08:29:32,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:29:32,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:29:32,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:34,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:29:34,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:34,312 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:29:34,312 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:29:34,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668901044] [2022-03-19 08:29:34,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [668901044] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:29:34,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216961094] [2022-03-19 08:29:34,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:29:34,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:29:34,313 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:29:34,314 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) [2022-03-19 08:29:34,315 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-19 08:29:34,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:34,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 46 conjunts are in the unsatisfiable core [2022-03-19 08:29:34,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:29:34,861 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:29:34,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:29:35,205 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-19 08:29:35,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216961094] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:29:35,205 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:29:35,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 10] total 20 [2022-03-19 08:29:38,601 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:29:38,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [702791261] [2022-03-19 08:29:38,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [702791261] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:29:38,602 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:29:38,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 08:29:38,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484585658] [2022-03-19 08:29:38,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:29:38,602 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 08:29:38,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:29:38,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 08:29:38,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=540, Unknown=0, NotChecked=0, Total=600 [2022-03-19 08:29:38,603 INFO L87 Difference]: Start difference. First operand 171 states and 211 transitions. Second operand has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:51,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:29:51,907 INFO L93 Difference]: Finished difference Result 278 states and 346 transitions. [2022-03-19 08:29:51,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-19 08:29:51,910 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-19 08:29:51,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:29:51,911 INFO L225 Difference]: With dead ends: 278 [2022-03-19 08:29:51,911 INFO L226 Difference]: Without dead ends: 206 [2022-03-19 08:29:51,911 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 83 SyntacticMatches, 5 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=294, Invalid=2676, Unknown=0, NotChecked=0, Total=2970 [2022-03-19 08:29:51,911 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 73 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 828 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 939 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:29:51,912 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 103 Invalid, 939 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 828 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-03-19 08:29:51,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-03-19 08:29:52,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 166. [2022-03-19 08:29:52,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.2608695652173914) internal successors, (203), 161 states have internal predecessors, (203), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:52,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 207 transitions. [2022-03-19 08:29:52,018 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 207 transitions. Word has length 41 [2022-03-19 08:29:52,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:29:52,018 INFO L478 AbstractCegarLoop]: Abstraction has 166 states and 207 transitions. [2022-03-19 08:29:52,018 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:52,018 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 207 transitions. [2022-03-19 08:29:52,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-19 08:29:52,018 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:29:52,018 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:29:52,036 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-03-19 08:29:52,223 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,SelfDestructingSolverStorable45 [2022-03-19 08:29:52,224 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:29:52,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:29:52,224 INFO L85 PathProgramCache]: Analyzing trace with hash 410232754, now seen corresponding path program 12 times [2022-03-19 08:29:52,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:29:52,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1950233821] [2022-03-19 08:29:52,349 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:29:52,349 INFO L85 PathProgramCache]: Analyzing trace with hash -467265357, now seen corresponding path program 1 times [2022-03-19 08:29:52,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:29:52,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147654623] [2022-03-19 08:29:52,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:29:52,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:29:52,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:53,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:29:53,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:53,327 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-19 08:29:53,328 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:29:53,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147654623] [2022-03-19 08:29:53,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147654623] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:29:53,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242348647] [2022-03-19 08:29:53,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:29:53,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:29:53,328 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:29:53,329 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) [2022-03-19 08:29:53,332 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-19 08:29:53,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:53,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 08:29:53,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:29:54,652 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:29:54,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:29:57,751 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:29:57,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242348647] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:29:57,752 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:29:57,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 17, 19] total 29 [2022-03-19 08:30:03,035 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:30:03,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1950233821] [2022-03-19 08:30:03,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1950233821] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:30:03,035 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:30:03,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:30:03,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902483500] [2022-03-19 08:30:03,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:30:03,036 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:30:03,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:30:03,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:30:03,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 08:30:03,036 INFO L87 Difference]: Start difference. First operand 166 states and 207 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:30:21,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:30:21,356 INFO L93 Difference]: Finished difference Result 199 states and 240 transitions. [2022-03-19 08:30:21,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-19 08:30:21,357 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 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 42 [2022-03-19 08:30:21,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:30:21,358 INFO L225 Difference]: With dead ends: 199 [2022-03-19 08:30:21,358 INFO L226 Difference]: Without dead ends: 168 [2022-03-19 08:30:21,358 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=331, Invalid=2639, Unknown=0, NotChecked=0, Total=2970 [2022-03-19 08:30:21,358 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 38 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:30:21,358 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 58 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-19 08:30:21,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-03-19 08:30:21,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 153. [2022-03-19 08:30:21,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 148 states have (on average 1.2567567567567568) internal successors, (186), 148 states have internal predecessors, (186), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:30:21,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 190 transitions. [2022-03-19 08:30:21,459 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 190 transitions. Word has length 42 [2022-03-19 08:30:21,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:30:21,459 INFO L478 AbstractCegarLoop]: Abstraction has 153 states and 190 transitions. [2022-03-19 08:30:21,459 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:30:21,459 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 190 transitions. [2022-03-19 08:30:21,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-19 08:30:21,460 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:30:21,460 INFO L500 BasicCegarLoop]: trace histogram [10, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:30:21,477 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-03-19 08:30:21,674 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:30:21,675 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:30:21,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:30:21,675 INFO L85 PathProgramCache]: Analyzing trace with hash 603994769, now seen corresponding path program 25 times [2022-03-19 08:30:21,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:30:21,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1784060501] [2022-03-19 08:30:21,789 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:30:21,789 INFO L85 PathProgramCache]: Analyzing trace with hash -1160205923, now seen corresponding path program 1 times [2022-03-19 08:30:21,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:30:21,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300749976] [2022-03-19 08:30:21,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:30:21,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:30:21,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:30:25,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:30:25,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:30:25,654 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:30:25,654 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:30:25,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300749976] [2022-03-19 08:30:25,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300749976] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:30:25,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407256649] [2022-03-19 08:30:25,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:30:25,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:30:25,654 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:30:25,655 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) [2022-03-19 08:30:25,656 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-19 08:30:25,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:30:25,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-19 08:30:25,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:30:26,493 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:30:26,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:30:30,335 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:30:30,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407256649] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:30:30,335 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:30:30,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 33 [2022-03-19 08:30:38,482 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:30:38,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1784060501] [2022-03-19 08:30:38,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1784060501] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:30:38,482 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:30:38,482 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-19 08:30:38,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723223921] [2022-03-19 08:30:38,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:30:38,482 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-19 08:30:38,482 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:30:38,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-19 08:30:38,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 08:30:38,483 INFO L87 Difference]: Start difference. First operand 153 states and 190 transitions. Second operand has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:58,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:33:58,842 INFO L93 Difference]: Finished difference Result 335 states and 442 transitions. [2022-03-19 08:33:58,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2022-03-19 08:33:58,844 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-19 08:33:58,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:33:58,845 INFO L225 Difference]: With dead ends: 335 [2022-03-19 08:33:58,845 INFO L226 Difference]: Without dead ends: 295 [2022-03-19 08:33:58,847 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 72 SyntacticMatches, 7 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9290 ImplicationChecksByTransitivity, 201.5s TimeCoverageRelationStatistics Valid=3704, Invalid=25708, Unknown=0, NotChecked=0, Total=29412 [2022-03-19 08:33:58,847 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 457 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 1313 mSolverCounterSat, 689 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 2002 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 689 IncrementalHoareTripleChecker+Valid, 1313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:33:58,847 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [457 Valid, 129 Invalid, 2002 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [689 Valid, 1313 Invalid, 0 Unknown, 0 Unchecked, 13.9s Time] [2022-03-19 08:33:58,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2022-03-19 08:33:58,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 171. [2022-03-19 08:33:58,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.2590361445783131) internal successors, (209), 166 states have internal predecessors, (209), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:58,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 213 transitions. [2022-03-19 08:33:58,965 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 213 transitions. Word has length 42 [2022-03-19 08:33:58,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:33:58,965 INFO L478 AbstractCegarLoop]: Abstraction has 171 states and 213 transitions. [2022-03-19 08:33:58,965 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:58,965 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 213 transitions. [2022-03-19 08:33:58,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-19 08:33:58,965 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:33:58,965 INFO L500 BasicCegarLoop]: trace histogram [10, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:33:58,982 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-03-19 08:33:59,182 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,SelfDestructingSolverStorable47 [2022-03-19 08:33:59,182 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:33:59,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:33:59,182 INFO L85 PathProgramCache]: Analyzing trace with hash -1815314640, now seen corresponding path program 26 times [2022-03-19 08:33:59,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:33:59,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1931017232] [2022-03-19 08:33:59,272 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:33:59,272 INFO L85 PathProgramCache]: Analyzing trace with hash 305398244, now seen corresponding path program 1 times [2022-03-19 08:33:59,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:33:59,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782315680] [2022-03-19 08:33:59,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:59,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:33:59,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:03,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:34:03,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:03,902 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-19 08:34:03,902 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:34:03,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782315680] [2022-03-19 08:34:03,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [782315680] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:34:03,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201941129] [2022-03-19 08:34:03,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:34:03,903 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:34:03,903 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:34:03,904 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) [2022-03-19 08:34:03,905 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-19 08:34:03,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:03,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 08:34:03,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:34:07,887 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:34:07,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:34:08,056 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:34:08,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201941129] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:34:08,056 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:34:08,056 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 26 [2022-03-19 08:34:17,879 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:34:17,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1931017232] [2022-03-19 08:34:17,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1931017232] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:34:17,880 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:34:17,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-19 08:34:17,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021208044] [2022-03-19 08:34:17,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:34:17,880 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-19 08:34:17,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:17,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-19 08:34:17,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=848, Unknown=0, NotChecked=0, Total=992 [2022-03-19 08:34:17,881 INFO L87 Difference]: Start difference. First operand 171 states and 213 transitions. Second operand has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:41,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:34:41,038 INFO L93 Difference]: Finished difference Result 295 states and 379 transitions. [2022-03-19 08:34:41,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-19 08:34:41,040 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 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 [2022-03-19 08:34:41,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:34:41,041 INFO L225 Difference]: With dead ends: 295 [2022-03-19 08:34:41,041 INFO L226 Difference]: Without dead ends: 282 [2022-03-19 08:34:41,041 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 37.8s TimeCoverageRelationStatistics Valid=481, Invalid=2599, Unknown=0, NotChecked=0, Total=3080 [2022-03-19 08:34:41,042 INFO L912 BasicCegarLoop]: 29 mSDtfsCounter, 126 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 621 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:34:41,042 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 81 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 621 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-03-19 08:34:41,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2022-03-19 08:34:41,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 185. [2022-03-19 08:34:41,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 180 states have (on average 1.2555555555555555) internal successors, (226), 180 states have internal predecessors, (226), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:41,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 230 transitions. [2022-03-19 08:34:41,167 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 230 transitions. Word has length 43 [2022-03-19 08:34:41,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:34:41,167 INFO L478 AbstractCegarLoop]: Abstraction has 185 states and 230 transitions. [2022-03-19 08:34:41,167 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:41,167 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 230 transitions. [2022-03-19 08:34:41,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-19 08:34:41,168 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:34:41,168 INFO L500 BasicCegarLoop]: trace histogram [10, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:34:41,197 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-03-19 08:34:41,384 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,SelfDestructingSolverStorable48 [2022-03-19 08:34:41,384 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:34:41,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:34:41,384 INFO L85 PathProgramCache]: Analyzing trace with hash 1831362498, now seen corresponding path program 27 times [2022-03-19 08:34:41,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:41,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [589934998] [2022-03-19 08:34:41,522 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:34:41,523 INFO L85 PathProgramCache]: Analyzing trace with hash -943641778, now seen corresponding path program 1 times [2022-03-19 08:34:41,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:34:41,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766869081] [2022-03-19 08:34:41,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:34:41,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:34:41,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:44,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:34:44,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:44,564 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-03-19 08:34:44,564 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:34:44,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766869081] [2022-03-19 08:34:44,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766869081] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:34:44,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138749853] [2022-03-19 08:34:44,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:34:44,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:34:44,564 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:34:44,565 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) [2022-03-19 08:34:44,566 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-19 08:34:44,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:44,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-19 08:34:44,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:34:45,200 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-03-19 08:34:45,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:34:47,994 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-03-19 08:34:47,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138749853] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:34:47,994 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:34:47,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2022-03-19 08:34:55,326 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:34:55,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [589934998] [2022-03-19 08:34:55,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [589934998] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:34:55,326 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:34:55,326 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 08:34:55,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514205325] [2022-03-19 08:34:55,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:34:55,327 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 08:34:55,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:55,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 08:34:55,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=834, Unknown=0, NotChecked=0, Total=930 [2022-03-19 08:34:55,327 INFO L87 Difference]: Start difference. First operand 185 states and 230 transitions. Second operand has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:35:19,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:35:19,625 INFO L93 Difference]: Finished difference Result 222 states and 267 transitions. [2022-03-19 08:35:19,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-19 08:35:19,626 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 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 44 [2022-03-19 08:35:19,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:35:19,627 INFO L225 Difference]: With dead ends: 222 [2022-03-19 08:35:19,627 INFO L226 Difference]: Without dead ends: 205 [2022-03-19 08:35:19,627 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 442 ImplicationChecksByTransitivity, 33.4s TimeCoverageRelationStatistics Valid=332, Invalid=2860, Unknown=0, NotChecked=0, Total=3192 [2022-03-19 08:35:19,627 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 50 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 907 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 983 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 907 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:35:19,627 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 109 Invalid, 983 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 907 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-03-19 08:35:19,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-03-19 08:35:19,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 181. [2022-03-19 08:35:19,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.25) internal successors, (220), 176 states have internal predecessors, (220), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:35:19,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 224 transitions. [2022-03-19 08:35:19,751 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 224 transitions. Word has length 44 [2022-03-19 08:35:19,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:35:19,752 INFO L478 AbstractCegarLoop]: Abstraction has 181 states and 224 transitions. [2022-03-19 08:35:19,752 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:35:19,752 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 224 transitions. [2022-03-19 08:35:19,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-19 08:35:19,752 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:35:19,752 INFO L500 BasicCegarLoop]: trace histogram [11, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:35:19,769 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-03-19 08:35:19,969 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,SelfDestructingSolverStorable49 [2022-03-19 08:35:19,969 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:35:19,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:35:19,969 INFO L85 PathProgramCache]: Analyzing trace with hash 2066056290, now seen corresponding path program 28 times [2022-03-19 08:35:19,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:35:19,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1164159768] [2022-03-19 08:35:20,069 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:35:20,069 INFO L85 PathProgramCache]: Analyzing trace with hash -506574930, now seen corresponding path program 1 times [2022-03-19 08:35:20,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:35:20,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086765063] [2022-03-19 08:35:20,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:35:20,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:35:20,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:35:26,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:35:26,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:35:26,282 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:35:26,282 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:35:26,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086765063] [2022-03-19 08:35:26,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086765063] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:35:26,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874753811] [2022-03-19 08:35:26,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:35:26,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:35:26,283 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:35:26,284 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) [2022-03-19 08:35:26,285 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-19 08:35:26,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:35:26,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 08:35:26,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:35:27,526 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:35:27,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:35:34,038 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:35:34,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874753811] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:35:34,038 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:35:34,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 36 [2022-03-19 08:35:46,164 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:35:46,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1164159768] [2022-03-19 08:35:46,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1164159768] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:35:46,165 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:35:46,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-19 08:35:46,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400854615] [2022-03-19 08:35:46,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:35:46,165 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-19 08:35:46,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:35:46,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-19 08:35:46,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1604, Unknown=0, NotChecked=0, Total=1722 [2022-03-19 08:35:46,166 INFO L87 Difference]: Start difference. First operand 181 states and 224 transitions. Second operand has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 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)